JP2009211802

Patent Translate
Powered by EPO and Google
Notice
This translation is machine-generated. It cannot be guaranteed that it is intelligible, accurate,
complete, reliable or fit for specific purposes. Critical decisions, such as commercially relevant or
financial decisions, should not be based on machine-translation output.
DESCRIPTION JP2009211802
PROBLEM TO BE SOLVED: To be able to form a good reproduction sound field without being
influenced by a difference in signal format such as audio data to be reproduced or a recording
medium, and to construct an easy-to-use reproduction system Provided is a signal reproduction
apparatus. SOLUTION: An RF signal processing circuit 106 and a video / audio decoding unit 107
detect signal type information of audio data to be read out and read from a medium type of the
optical disk 100 and the optical disk 100, and based on the detected information. The system
control unit 114 and the interface control unit 117 control the power supply of the speaker
amplifier, and control the signal processing in the audio signal processing unit 109 to
appropriately reproduce the audio corresponding to the audio data to be reproduced. Do.
[Selected figure] Figure 1
Information signal reproduction device
[0001]
The present invention relates to, for example, an information signal reproducing apparatus for
reproducing an information signal such as audio data recorded on a recording medium such as
various optical disks.
[0002]
As a recording medium for providing audio data such as music, an optical disc for music called
CD-DA (Compact Disc Digital Audio) is widely used.
09-05-2019
1
On this CD-DA, for example, LPCM (Linear Pulse Code Modulation) -encoded audio data capable
of relatively accurately reproducing the original sound is recorded and provided to the end user.
Further, in recent years, CD-DA in which audio data is recorded in a data storage format called
DTS (Digital Theater System) system has also been provided.
[0003]
This DTS system is called, for example, 5.1 channels of five satellite speakers including one front
speaker on each side, a center speaker, and one rear speaker on each side, and one subwoofer.
This is a method for reproducing sound so as to form a realistic sound reproduction field using
six speakers. A home audio system compatible with the DTS system, which comprises a CD player
and speakers capable of reproducing audio data recorded by the DTS system, has also been
provided. DTS is a registered trademark of Digital Theater Systems.
[0004]
For example, an optical disc called DVD (Digital Video Disc / Digital Versatile Disc) is used as a
recording medium for providing digital content such as a movie, including audio data such as
music as well as video data for a relatively long time. It has become possible to
[0005]
It is also possible to record and provide music information on this DVD, and it is possible to
reproduce the original sound relatively faithfully as in the case of the above-mentioned CD, for
example, LPCM coded music etc. The DVD on which audio data is recorded is called DVD-Audio.
Also, a DVD on which a relatively long time of video data such as a movie is recorded together
with audio data is called DVD-Video.
[0006]
Then, in the case of DVD-Video, video data is compressed by, for example, the MPEG (Motion
Picture Expert Group) method and recorded. In addition, audio data such as music, sound effects
09-05-2019
2
and conversations are compressed using the AC-3 (Audio Code number 3) method for the
purpose of effective use of the storage area or formation of a realistic sound reproduction field.
Recording is performed or recording is performed by the above-described DTS method.
[0007]
However, for example, it is inconvenient in the case of reproducing LPCM-encoded 2-channel
stereo audio data (2-channel stereo source) recorded on CD-DA using a home audio system
compatible with DTS. May occur.
[0008]
For example, it is assumed that audio data of a 2-channel stereo source is distributed to five
satellite speakers and one subwoofer called 5.1 channel described above and reproduced using a
home audio system compatible with the DTS system.
In this case, the bass of the reproduced voice may be overemphasized, which may cause a sense
of incongruity. In such a case, the user (user) adjusts the equalizer of the home audio system, but
it takes time and effort to obtain a good reproduction sound.
[0009]
Also, using a home audio system compatible with the DTS system, audio data from a 2-channel
stereo source is front speakers on the left and right of the five satellite speakers and one
subwoofer called 5.1 channel described above. To play using only
[0010]
In this case, some noise may be emitted from the center speaker to which audio data is not
supplied, the rear speakers on the left and right, and the subwoofer, and it may not be possible to
provide a good playback sound field. Be
In such a case, it is necessary to make adjustments such as reducing the volume of unused
speakers, which is troublesome for the user.
09-05-2019
3
[0011]
This can also occur in a home AV (audio visual) system provided with a DVD player compatible
with the DTS system. That is, in the case of a DVD in which audio data is recorded by a method
other than the DTS method, a good reproduction sound field may not be formed in a home AV
system compatible with the DTS method.
[0012]
Further, the CD and the DVD are both optical disks, and the player's reproduction mechanism
and the transmission path of the reproduction signal can be commonly used. For this reason, it is
also possible to form a so-called multi-convertible player capable of reproducing information
signals recorded on a CD and also reproducing information signals recorded on a DVD.
[0013]
However, the production intention and the like differ between the music information recorded on
the CD-DA and the audio data recorded on the DVD-Video. Therefore, when reproducing audio
data from CD-DA or DVD-Video using a multi-convertable player, reproducing audio data
recorded in CD-DA, and audio recorded in DVD-Video. In the case of reproducing data, it is
necessary to adjust the volume level and the like.
[0014]
That is, although the music information for listening (appreciation) is mainly recorded on the CDDA, the average level of the audio data is relatively increased in order to satisfactorily reproduce
the music information recorded on the CD-DA. Often recorded on CD-DA. On the other hand,
DVD-Video often records content composed of audio data such as a movie and video data. The
audio data in this case is audio data associated with the video data, and is often created as a socalled sound effect, and the average level thereof is often relatively low.
[0015]
09-05-2019
4
Therefore, after reproducing and listening to the audio data recorded on the CD-DA using the
multi-convertible player, the audio data and the video data of the movie recorded on the DVDVideo are reproduced and viewed. If so, the volume level is too low and the user has to make an
operation to raise the volume level.
[0016]
Conversely, after the audio data and video data of a movie recorded on the DVD-Video are
reproduced and viewed using a multi-convertible player, the audio data recorded on the CD-DA is
reproduced and listened If this is the case, the volume level is too high, and the user must
perform an operation to reduce the volume level.
[0017]
As described above, when using a CD player, a DVD player, or a multi-compatible player capable
of reproducing information recorded on a CD and information recorded on a DVD, the signal
format of audio data, Depending on the type of recording medium on which the audio data to be
reproduced is recorded, it is necessary to perform adjustment operations such as an equalizer
and a volume control so that the user himself / herself forms a reproduction sound field which he
/ she likes most.
[0018]
For this reason, if it is intended to always form a playback sound field according to one's
preference, various adjustments for the playback sound are required, which takes a very long
time.
In addition, the adjustment may not be successful, and as a result, there may not be an optimum
environment suited to one's own taste.
[0019]
In view of the above, the present invention is not influenced by the difference in signal format
such as audio data to be reproduced, recording media, etc., and does not bother the user, and a
good reproduction sound field can be obtained. It is an object of the present invention to provide
an information signal reproduction apparatus which can be formed and can construct an easy-touse reproduction system.
09-05-2019
5
[0020]
In order to solve the above problems, an information signal reproduction apparatus according to
the invention of claim 1 is characterized in that, from a reproduction signal, first information for
detecting first information indicating a type of a recording medium in which the reproduction
signal is recorded. Detection means; second information detection means for detecting, from the
reproduction signal, second information indicating a signal format of the sound data including
the number of reproduction channels of the sound data included in the reproduction signal;
Power source control means for performing power source control of the speaker amplifier
according to the number of reproduction channels based on the first information and the second
information; and the reproduction according to a signal format corresponding to the first
information. And bass control means for performing control to enhance or attenuate the bass of
the voice corresponding to the signal.
[0021]
According to the information signal reproducing apparatus of the invention described in claim 1
of this application, the first information detecting means indicates the type (for example, DVD or
CD) of the recording medium in which the reproduction signal is recorded. Information is
detected.
Further, the second information detection means indicates a second signal format of audio data
(for example, AC-3 system or DTS system or other than that) including the number of
reproduction channels of audio data included in the reproduction signal. Information is detected.
[0022]
Then, based on the detected first and second information, power control of the speaker amplifier
according to the number of reproduction channels is performed by the power control means.
Further, according to the signal format indicated by the second information corresponding to the
first information, control is performed to enhance or attenuate the low frequency range of the
sound to be reproduced by the low frequency range control means.
09-05-2019
6
[0023]
As a result, it is possible to form a good reproduction sound field without being influenced by the
difference in the signal format of the audio data to be reproduced, the recording medium and the
like, and without bothering the user.
In addition, by using the information signal reproduction device, an easy-to-use reproduction
system can be constructed.
[0024]
According to the present invention, even when the user of the reproduction apparatus
reproduces audio data of different signal format or reproduces the audio data recorded in
different recording media, the audio of those The optimum reproduction sound field can be
automatically formed without being aware of differences in data characteristics.
Therefore, it is possible to realize a very easy-to-use playback device that reduces the adjustment
work for playback audio and does not bother the user.
[0025]
In addition, according to the type of audio data to be reproduced, such as music audio and movie
audio, it is possible to create an optimal sound according to the audio data, so that more
attractive sound can be created.
[0026]
Also, in a system that consists of five satellite speakers (satellite channels) and one dedicated
bass speaker (bass dedicated channel), such as a home theater system, audio data is supplied
when playing audio data of 2-channel stereo. It is possible to greatly improve the S / N of the
reproduced sound field by muting a channel that is not received or stopping the operation of that
channel.
[0027]
Further, since the power on / off control of the speaker amplifier and the video output device can
09-05-2019
7
be automatically performed, it is possible to form an easy-to-use system.
[0028]
It is a block diagram for demonstrating the video audio reproduction apparatus with which one
Embodiment of the information signal reproduction apparatus by this invention was applied.
It is a figure for demonstrating the structural example of the home theater formed using the
video audio reproduction apparatus shown in FIG.
It is a figure for demonstrating the output control of the audio ¦ speech data performed in the
video and audio reproduction apparatus shown in FIG.
FIG. 6 is a flowchart for describing output control of audio data performed when it is determined
that the loaded recording medium is a DVD in the video and audio reproduction apparatus shown
in FIG. 1. It is a figure for demonstrating the signal processing of the audio ¦ speech data
performed in the audio ¦ voice signal processing part of the video audio reproduction apparatus
shown in FIG. It is a figure for demonstrating power supply control and mute control about the
speaker amplifier of the video sound reproduction apparatus shown in FIG. FIG. 6 is a flowchart
for describing output control of audio data performed when it is determined that the loaded
recording medium is a CD in the video and audio reproduction device shown in FIG. 1.
[0029]
Hereinafter, an embodiment of an information signal reproduction apparatus according to the
present invention will be described with reference to the drawings. In the embodiment described
below, an information signal reproduction apparatus according to the present invention is an
optical disk reproduction apparatus, and is a music CD (CD-DA), a video DVD (DVD-Video), an
audio DVD The case where the present invention is applied to a so-called multi-convertible player
capable of reproducing with (DVD-Audio) will be described as an example.
[0030]
[Overview of Video and Audio Reproduction Apparatus 10 and Home Theater System] FIG. 1 is a
09-05-2019
8
block diagram for explaining an optical disc reproduction apparatus (video and audio
reproduction apparatus) 10 to which an information signal reproduction apparatus according to
the present invention is applied. These are figures for demonstrating the structural example of
the home theater system comprised using the reproducing ¦ regenerating apparatus 10 of this
embodiment.
[0031]
The playback device 10 of this embodiment can also play back audio data created by the DTS
method in accordance with the method.
As shown in FIGS. 1 and 2, the reproducing apparatus 10 according to this embodiment includes
a left front speaker 20L, a right front speaker 20R, a center speaker 20C, a left rear speaker
20LS, a right rear speaker 20RS, and a subwoofer speaker 20LFE. It is That is, the reproduction
device 10 of this embodiment corresponds to a so-called 5.1 channel multi surround system
including five satellite speakers and one subwoofer (speech only speaker).
[0032]
And these six speakers are arrange ¦ positioned so that the position of the chair which shows a
viewing-and-listening position of a viewer may be enclosed, as shown in FIG. In the case of FIG. 2,
the front speakers 20L and 20R are installed with the video output device 30 such as a television
receiver or monitor receiver interposed, the center speaker 20C is installed on the video output
device 30, and the subwoofer The 20 LFE is installed on the left side of the video output device
30.
[0033]
The left and right rear speakers are located slightly behind the chair indicating the viewing
position of the viewer, and are installed on the left and right wall surfaces so as to sandwich the
viewer's position. When the speakers are arranged as described above and the reproduction
device 10 of this embodiment reproduces the contents of a movie recorded on DVD-Video and
whose audio data is formed by the DTS method described above, the theater is In the same way
as when watching a movie, it is possible to create a realistic playing field (sound listening
09-05-2019
9
environment) in which the bass is emphasized.
[0034]
[Configuration of Video and Audio Reproduction Device 10] Next, the reproduction device 10 of
this embodiment will be described in detail. In FIG. 1, the disc 100 is an optical disc such as a CDDA, a DVD-Video, and a DVD-Audio as described above. The CD-DA is a recording of audio data
such as music encoded by the LPCM method, audio data such as rakugo, recitation, conversation,
etc., or audio data such as music formed by the DTS method.
[0035]
Also, DVD-Audio is a recording of audio data of mainly music encoded by various encoding
methods. The DVD-Video is video data compressed by the MPEG system and audio data attached
to the data, and is formed by audio data compressed by the AC-3 system or MPEG-Audio system
or DTS system. Voice data is recorded.
[0036]
Then, as shown in FIG. 1, the reproducing apparatus 10 of this embodiment irradiates a laser
beam to the spindle motor 101 for rotating the optical disc 100 and the optical disc 100, and
receives the reflected light from the optical disc 100. The optical pickup unit 102 reads data
recorded on the optical disk 100, and a thread motor 103 for moving the optical pickup unit 102
in the radial direction of the optical disk 100.
[0037]
The optical pickup unit 102 is a laser light source, an objective lens, for example, an optical
system such as a four-division photo detector, and a mechanism such as a biaxial actuator that
adjusts the position of the optical pickup unit 2 in the direction orthogonal to the optical disc and
the radial direction Are also provided.
[0038]
Then, the optical pickup unit 102 irradiates a laser beam to the optical disc 100 rotationally
driven by the spindle motor 101, and the reflected light from the optical disc 100, which changes
according to the pits formed on the optical disc 100, is received by the photodetector. And
09-05-2019
10
convert it into an electronic signal, which is supplied to an RFEQ (RF equalizer) amplifier 105.
[0039]
The RFEQ 105 performs equalization processing on the electrical signal supplied thereto, and
supplies the electrical signal after equalization processing to the RF signal processing circuit 106.
The RF signal processing circuit 106 forms a servo error signal such as a reproduction RF signal
(binary digital signal), a focus error signal, and a tracking error signal based on the electric signal
from the RFEQ amplifier 105.
[0040]
Further, the RF signal processing circuit 106 superimposes, for example, information such as
copy control information, medium type, signal format of reproduction RF signal, etc. on video
data and audio data as digital watermark information (electronic water mark) etc. If so, they
extract their information from the formed reproduction RF signal.
[0041]
Then, the RF processing circuit 106 supplies the generated reproduction RF signal to the video /
audio decoding unit 107, and supplies a servo error signal such as a focus error signal or a
tracking error signal to the servo circuit 115.
Further, when the RF processing circuit 106 extracts, for example, control information
superimposed as digital watermark information on the reproduction RF signal, the RF processing
circuit 106 supplies the extracted information to the system control unit 114.
[0042]
The servo circuit 115 receives various servo error signals from the RF signal processing circuit
106 and the control signal from the system control unit 114 to form a focus servo signal and a
09-05-2019
11
tracking error signal. Supply to
Thereby, focus servo and tracking servo are applied.
[0043]
Also, the servo circuit 115 forms a rotation servo signal based on the servo error signal supplied
thereto and the control signal from the system control unit 114, and supplies this to the motor
driver 104.
[0044]
The motor driver 104 forms a drive signal to be supplied to the spindle motor 101 based on the
rotation servo signal for the spindle motor 101 from the servo circuit 115, and supplies this to
the spindle motor 101.
Further, the motor driver 104 forms a drive signal to be supplied to the thread motor 103 based
on the rotation servo signal for the thread motor 103 from the servo circuit 115 and supplies
this to the thread motor 103.
As a result, the rotational servo of the spindle motor 101 and the thread motor 103 is applied.
[0045]
In this manner, focus servo, tracking servo, and rotational servo are applied to rotate the optical
disc 100 at an appropriate speed, and a spot of the laser beam emitted from the optical pickup
unit 102 has an appropriate size. Then, the target track is accurately scanned, and the data
recorded on the optical disc 100 is correctly read.
[0046]
On the other hand, the video / audio decoding unit 107 decodes a reproduction RF signal which
is a binary digital signal from the RF signal processing circuit 106.
09-05-2019
12
As shown in FIG. 1, for example, a dynamic random access memory (D-RAM) 108 used as a work
area at the time of decoding is connected to the video / audio decoding unit 107. Then, as
described later, the video / audio decoding unit 107 supplies the decoded audio data and the
audio signal to the audio signal processing unit 109, and the video data subjected to the
decoding processing is converted to a video D / A conversion circuit 113. Supply to
[0047]
Also, the video / audio decoding unit 107 is a reproduction RF signal from a predetermined area
of the optical disc 100 in which the signal format of the audio signal such as the medium type,
the encoding method of the audio signal, the number of reproduction channels, and the sampling
frequency is recorded. Information decoded (hereinafter referred to as decoded information). ) Is
supplied to the system control unit 114.
[0048]
The predetermined area of the optical disc in which the medium type and the signal format are
recorded is the lead-in area of the optical disc, the TOC (Table Of Contents) provided in the
predetermined position of the optical disc, the area of the directory, or the front and back of the
data field. Area of sync word (information for synchronization) provided in
[0049]
The system control unit 114 is a microcomputer provided with a CPU, a ROM, a RAM, an
EEPROM, and the like.
The system control unit 114 determines the medium type of the optical disc 100 loaded in the
reproducing apparatus 10 based on the information extracted by the RF signal processing circuit
106 and the decoding information from the video / audio decoding unit 107. The optical disc
100 may be one in which only audio data is recorded, or one in which video data and audio data
are recorded, and further, the encoding format of audio data recorded on the optical disc 100,
the number of reproduction channels, the sampling frequency To determine
[0050]
09-05-2019
13
The medium type indicates whether the optical disc 100 loaded in the reproducing apparatus 10
of this embodiment is a CD or a DVD. Further, in this embodiment, as the encoding format, audio
data recorded on the optical disc 100 is encoded and recorded by any of LPCM, AC-3, MPEG
audio and DTS. It shows what it is.
[0051]
Also, the number of reproduction channels indicates monaural, two-channel, or 5.1-channel
multi-surround. Further, the sampling frequency indicates the sampling frequency in the case of
audio data compressed by the LPCM method.
[0052]
Further, in the reproducing apparatus 100 according to this embodiment, as described above, it
is possible to determine whether only audio data is recorded or whether video data and audio
data are recorded. There is. Further, in this embodiment, in the case of audio data created by the
DTS method, the number of reproduction channels is 5.1 channel multi-surround.
[0053]
If control information or the like is not superimposed as video data or audio data recorded on the
optical disc 100, for example, as digital watermark information, the medium type, the audio data
encoding format, the number of reproduction channels, the sampling frequency, etc. Is
determined only by the decoding information from the video / audio decoding unit 107.
[0054]
Then, according to the analysis result as described above, the system control unit 114 forms a
control signal for controlling the decoding process of video data and audio data as main
information, and supplies this to the video / audio decoding unit 107. .
The control signal is information for controlling how to decode video data and audio data or
09-05-2019
14
audio data only.
[0055]
The system control unit 114 also notifies the interface control unit 116 of the analysis result as
described above. In this embodiment, the interface control unit 116 is a microcomputer provided
with a CPU, a ROM, a RAM, an EEPROM, and the like. The interface control unit 116 controls an
operation key unit 117, an operation display unit 118, and a memory slot 119 which will be
described later. Further, based on the analysis result from the system control unit 114, the
interface control unit 116 is an audio signal processing unit, an audio D / A conversion unit 110,
an audio volume (described as audio VOL in FIG. 1), and a speaker. An audio system including an
amplifier (power amplifier) 112 is controlled.
[0056]
That is, in the playback apparatus 10 of this embodiment, the interface control unit 116 controls
the audio system, and the system control unit 114 controls each unit other than the audio system
to distribute the control load, and the system is quickly And accurate data processing is realized.
[0057]
Further, the interface control unit 116 forms display information of information that needs to be
notified to the user, such as the medium type, among the analysis results from the system control
unit 114, and is configured by an LCD (liquid crystal display) or the like. By supplying to the
operation display unit 118, the medium type of the optical disc loaded in the reproducing
apparatus 10 of this embodiment is displayed on the operation display unit 118 and notified to
the user.
[0058]
Then, the video / audio decoding unit 107 receives the video data supplied as the reproduction
RF signal (binary digital signal) from the RF signal processing circuit 116 in response to the
control signal from the system control unit 114 as described above. Only audio data or audio
data is decoded according to the encoding method.
[0059]
09-05-2019
15
For example, in the case where the reproduction RF signal is a mixture of video data and audio
data and data compression is performed according to the same method, the video / audio
decoding unit 107 uses the data-compressed video data and audio data. The mixed reproduction
RF signal is decoded and expanded to separate video data and audio data.
Then, the expanded audio data is supplied to the audio signal processing unit 119, and the
expanded video data is supplied to the video D / A conversion circuit 113.
[0060]
Also, when the reproduction RF signal includes video data and audio data, and each is encoded
by a different encoding method, the video / audio decoding unit 107 separates the video data
from the audio data.
Then, the audio data is supplied to the audio signal processing unit 109 in a compressed state,
and the video data is decoded and expanded, and the expanded video data is supplied to the
video D / A conversion circuit 113.
[0061]
In addition, when the reproduction RF signal is from CD-DA or DVD-Audio and only audio data
which does not contain video data, the video / audio decoding unit 107 performs necessary
decoding processing for the audio data. To the audio signal processing unit 109.
[0062]
Then, in the case where the supplied audio data remains encoded as in the compressed data, the
audio signal processing unit 109 decodes the audio data according to the control from the
interface control unit 116. , Restore voice data to the original voice data.
[0063]
Further, in the case where the audio data has a plurality of reproduction channels, for example,
when the audio data is recorded on the optical disc 100 by the DTS method, the audio signal
processing unit 109 generates audio data for each reproduction channel. To separate.
09-05-2019
16
In addition, it is possible to add the desired effect to audio data by digitally computing filtering
processing, delay processing, etc. to output audio data, adjusting the frequency characteristics
and level of the audio data, etc. It is.
[0064]
Thus, in the case of audio data decoded by the audio signal processing unit 109 and having audio
channels having a plurality of playback channels, the audio data for each playback channel
separated into each playback channel is the audio D / A circuit 110. Supplied to
The audio D / A circuit 110 converts audio data supplied thereto from digital signals to analog
signals, and converts the analog audio signals to the speaker amplifiers 112L, 112C, 112R,
112LS, 112RS, 112LEF of the corresponding reproduction channels. Supply.
[0065]
Each speaker amplifier amplifies the analog audio signal supplied thereto and supplies it to the
corresponding speakers 20L, 20C, 20R, 20LS, 20RS, 20LEF to drive these speakers.
As a result, sound corresponding to the sound data recorded on the optical disc 100 is emitted
from each speaker.
[0066]
Further, as described above, the video data decoded by the video / audio decoding unit 107 and
supplied to the video D / A conversion circuit 113 is supplied from the digital signal to the
analog signal here, and the video of the television receiver or the like It is supplied to the output
device 30. As a result, a reproduced video corresponding to the video data recorded on the
optical disc 100 is displayed on the display screen of the video output device 30.
09-05-2019
17
[0067]
The reproducing apparatus 10 according to this embodiment includes not only an optical disk
but also a memory slot 119 which is a loading port of an external semiconductor memory 120
called a memory stick or the like. Then, the external semiconductor memory 120 in which video
data and audio data are recorded by a digital still camera or digital video camera, and the
external semiconductor memory 120 in which audio data is recorded by a recording device are
loaded (mounted) in the memory slot. The video data and the audio data recorded in the external
semiconductor memory 120 can be reproduced.
[0068]
The interface control unit 116 reads the video data and audio data recorded in the external
semiconductor memory 120 loaded in the memory slot 119 through the memory slot 119. In
this embodiment, the audio data is supplied from the interface control unit 116 to the audio
signal processing unit 109 and reproduced, and the video data is transmitted from the interface
control unit 116 to the video / audio decoding unit 104, The video A / D converter 113
reproduces the video.
[0069]
In addition, the reproducing apparatus 10 of this embodiment receives an instruction input from
the user (user) of the reproducing apparatus 10 through the operation key unit 117, performs
processing according to the instruction input, or receives an instruction input. The corresponding
parameters can be set in the interface control unit 116 or in the EEPROM which is a non-volatile
memory of the system control unit 114.
[0070]
As described above, the reproducing apparatus 10 according to this embodiment includes audio
data and video recorded in various signal formats on different recording media such as CD-DA,
DVD-Video, DVD-Audio, or an external semiconductor memory. It is possible to reproduce data.
[0071]
Then, even if the audio data from any recording medium, and the audio data of any signal format,
even if the playback apparatus 10 is adjusted so that the maximum audio levels become equal, As
described above, audio data such as music recorded at a relatively high average audio level on
09-05-2019
18
CD-DA and audio recorded at a relatively low average audio level such as a movie audio recorded
on DVD-Video In the case where data and data are alternately reproduced, it may be necessary to
manually adjust the volume level each time.
[0072]
That is, depending on the production intention of the audio data recorded on the recording
medium and the creation environment, the audio data reproduced up to now and the audio data
recorded on a different recording medium may be reproduced, or different signals may be
reproduced. In the case where the audio data in the form is reproduced, there are cases where
the user has to manually adjust the reproduced audio one by one in order to listen well to the
reproduced audio.
[0073]
Therefore, in the reproducing apparatus 10 of this embodiment, the user is presumed by
estimating the type of the audio data from the medium type and the signal format of the audio
data, and performing output control of the audio data according to the type. It is possible to
listen well to the reproduced voice without manually adjusting the reproduced voice.
[0074]
[Regarding Estimation of Type of Audio Data and Output Control of Audio Data] Hereinafter,
estimation of the type of audio data performed in the reproduction device 10 of this embodiment
and output control of audio data based on an estimation result will be described. Do.
FIG. 3 is a flow chart for explaining the estimation of the type of audio data performed in the
playback apparatus of this embodiment and the output control of audio data based on the
estimation result.
[0075]
In this embodiment, the process shown in FIG. 3 is performed by the system control unit 114 and
the interface control unit 116 when an optical disk or an external semiconductor memory is
loaded into the reproducing apparatus 10 of this embodiment.
09-05-2019
19
That is, when the optical disk 100 is loaded into the playback device 10, the playback device 10
needs to be recorded on the optical disk 100 by rotationally driving the loaded optical disk and
irradiating a laser beam from the optical pickup unit 102. Perform preprocessing to read out
[0076]
That is, when the optical disc 100 is loaded, as described above, the reproducing apparatus 10
has a predetermined position, such as the TOC, the directory, the lead-in area, and the sync word
provided before and after the data field. The data indicating the medium type and the signal
format recorded in are read.
[0077]
As described above, the read data (electrical signal) is supplied to the RF signal processing circuit
106 through the RFEQ amplifier 105, where it is converted into a reproduction RF signal and
supplied to the video / audio decoding unit 107. .
At this time, the RF signal processing circuit 105 extracts the information superimposed on the
reproduction RF signal, and the extracted information is supplied to the system control unit 114.
Further, the video / audio decoding unit 107 decodes a reproduction RF signal from a
predetermined area such as TOC or detector of the optical disk, and supplies the decoded
information (decoding information) to the system control unit 114.
[0078]
Then, as described above, the system control unit 114 supplies audio data and image data to be
reproduced based on the information extracted by the RF signal processing circuit 106 and the
decoded information from the video / audio decoding unit 107. It is determined whether the
optical disk 100, which is the original recording medium, is a CD or a DVD (step S101).
[0079]
Further, in the reproducing apparatus 10 of this embodiment, when the external semiconductor
memory 120 is loaded in the memory slot 119 and the reproduction of data from the external
semiconductor memory 120 is instructed through the key operation unit 117, the interface
09-05-2019
20
control unit 116. However, it is determined that the recording medium at the supply source of
audio data and image data to be reproduced is the external semiconductor memory 120, and the
system control unit 114 is notified of this (step S101).
[0080]
Then, the system control unit 114 determines whether the recording medium, which is a supply
source of audio data and image data to be reproduced, is a DVD based on the determination
result of step S101 (step S102).
If it is determined in step S102 that the recording medium is a DVD, the system control unit 114
executes an audio data output control routine for a DVD (step S103), and the process shown in
FIG. 3 is performed. Finish.
[0081]
If it is determined in step S102 that the recording medium is not a DVD, the system control unit
114 determines whether the recording medium is a CD (step S104).
If it is determined in step S104 that the recording medium is a CD, the system control unit 114
executes an audio data output control routine for CD (step S105), and the process shown in FIG.
3 is performed. Finish.
[0082]
If it is determined in step S104 that the recording medium is not a CD, the system control unit
114 executes the control routine in other cases (step S106), and ends the process shown in FIG.
That is, in this embodiment, in step S106, an output control routine of audio data in the case of
the external semiconductor memory is executed.
09-05-2019
21
[0083]
[Regarding Output Control Process in the Case of DVD] FIG. 4 is a flowchart for illustrating the
process executed in step S103 of the flowchart shown in FIG.
That is, the system control unit 114 executes the process shown in FIG. 4 when it determines
that the recording medium on which the audio data to be reproduced is recorded is a DVD.
[0084]
Then, first, as described above, the system control unit 114 determines the signal format of audio
data to be reproduced based on the information from the RF signal processing circuit 106 and
the decoding information from the video / audio decoding unit 107. It discriminates (step S201).
In the process of step S201, the coding method of audio data to be reproduced is determined.
[0085]
Then, the system control unit 114 determines whether the encoding format of the audio data to
be reproduced is the AC-3 system or the DTS system based on the determination process of step
S201 (step S202). If it is determined in step S202 that the encoding format of audio data to be
reproduced is AC-3 or DTS, it is assumed that audio data to be reproduced is movie audio. (Step
S203).
[0086]
That is, when the audio data encoding method is AC-3 or DTS among digital contents provided by
DVD, the digital contents are overwhelmingly often digital contents of a movie. . Based on this
empirical fact, when the recording medium is a DVD, and the encoding method of the audio data
recorded on the DVD is the AC-3 system or the DTS system, the reproduction of this embodiment
is performed. The device 10 estimates that the audio data recorded on the DVD is movie audio.
[0087]
09-05-2019
22
Then, the system control unit 114 determines the number of reproduction channels of audio data
to be reproduced based on the information from the RF signal processing circuit 106 and the
decoding information from the video / audio decoding unit 107 (step S204). .
[0088]
Thereafter, by the control of the interface control unit 116 which receives the supply of
instruction information according to the medium type and the signal format discrimination result
from the system control unit 114, the speaker amplifier control corresponding to each speaker
according to the number of reproduction channels (step S205), the bass region emphasizing
process by the audio signal processing circuit 109 (step S206), and the volume level raising
process by the audio volume 111 (step S207) are performed.
[0089]
[Details of Speaker Amplifier Control] The processes of steps S205 to S207 will be described
below.
First, speaker amplifier control according to the reproduction channel performed in step S205
will be described.
FIG. 5 is a view for explaining the speaker amplifier unit 112 of the reproduction device 10 of
this embodiment. As shown in FIG. 5, speaker amplifiers 112L, 112C, 112R, 112LS, 112RS,
112LEF are provided corresponding to the respective speakers.
[0090]
Further, as shown in FIG. 5, power switches S1L, S1C, S1R, S1LS, S1RS, S1LFE for controlling the
supply of power are provided corresponding to each speaker amplifier, and mute of the audio
signal is provided. Mute switches S2L, S2C, S2R, S2LS, S2RS, S2LFE for performing are provided.
[0091]
When the number of reproduction channels is 2-channel stereo, only the power switches S1L and
S1R are turned on and the other power switches are turned off under the control of the interface
09-05-2019
23
control unit 116.
In this case, each mute switch may remain in the off state (non-mute state). Alternatively, only the
mute switches S2L and S2R are turned off (not muted), and the other mute switches are turned
on (muted). In this case, each power switch may remain in the on state.
[0092]
Of course, the power switch of the speaker amplifier to be operated is turned on, the mute switch
of the speaker amplifier to be operated is turned off, and the power switch of the speaker
amplifier not to be operated is turned off and the speaker amplifier not to be operated It is also
possible to control both the corresponding power switch and the mute switch by turning on the
mute switch of
[0093]
In addition, when the number of reproduction channels is 5.1 multi-surround or the audio data
signal format is the DTS system, each power switch shown in FIG. 5 is turned on and each mute
switch is turned off. Put in a state.
Thus, according to the number of reproduction channels, control is performed to operate only
the speaker amplifier of the speaker corresponding to the reproduction channel to be used, or
the audio signal is output only from the speaker amplifier of the speaker corresponding to the
reproduction channel to be used By doing this, even if the audio data is 2-channel stereo, a good
reproduction sound field (reproduction environment) free of noise is realized.
[0094]
[Details of Bass Enhancement Processing] Next, bass range enhancement processing realized by
controlling the audio signal processing unit 109 by the interface control unit 116 in step S206
will be described. FIG. 6 is a diagram for explaining the bass region emphasizing process of the
audio signal performed in the audio signal processing unit 109 when the audio data to be
reproduced is 5.1 channel multi-surround.
09-05-2019
24
[0095]
That is, when the audio data to be reproduced is 5.1 channel multi-surround, the interface
control unit 116 controls the audio signal processing unit 109 to, for example, five satellite
speakers 20L as shown in FIG. , 20C, 20R, 20LS, and 20RS, providing high pass filters (described
as HPF in FIG. 6) 91, 92, 93, 94, and 95 for each of the reproduction channels L, C, R, LS, and RS
corresponding to Simultaneously with the addition circuit 96 for adding the audio data of the
reproduction channels L, C, R, LS, and RS, and a low pass filter for receiving the output audio data
from the addition circuit 96 (in FIG. 97 and gain adjustment circuit 98 are provided.
[0096]
The HPFs 91, 92, 93, 94, 95 form audio data to be supplied to the corresponding satellite
speakers (speakers other than the subwoofer) by attenuating the bass component of the audio
data supplied thereto.
Further, the audio data formed by the addition processing by the addition circuit 96 is supplied
to the LPF 97 to attenuate the high frequency component. The audio data with the high
frequency components attenuated is supplied to the gain adjustment circuit 98 to increase the
signal level of the audio data whose high frequency components are attenuated, and supplied to
the subwoofer 20LFE that enhances the low frequency region. Form voice data.
[0097]
As described above, the function of the audio signal processing unit 109 controlled by the
interface control unit 116 enables the formation of audio data for reproducing a realistic
reproduced audio in which the bass range is emphasized. When the number of reproduction
channels is two-channel stereo, for example, the bass range can be emphasized by attenuating
high-pitched components of audio data supplied to the left and right front speakers using a lowpass filter. That is, the process of increasing the gain of the bass component and emphasizing the
bass is the process of step S206.
[0098]
[Details of Audio Level Up] Next, the audio level up realized by controlling the audio volume 111
09-05-2019
25
by the interface control unit 116 in step S207 will be described. As described above, since the
average voice level of the movie voice is kept relatively low compared to the music voice, in step
S207, the voice volume 111 is increased to increase the signal level of the voice data. An
adjustment is made.
[0099]
As a result, the signal level of the audio data of the movie to be reproduced is raised to a
predetermined level, and the signal levels of various audio data reproduced by the reproducing
apparatus 10 are always made substantially constant. The adjustment of the signal level of audio
data can also be performed as digital signal processing in the audio signal processing unit 109
described above. However, by using the audio volume 111, it is possible to prevent so-called bit
drop of audio data and to prevent deterioration of reproduced audio.
[0100]
As described above, when it is presumed that the audio data to be reproduced is movie audio, the
speaker amplifier unit 112, audio so as to reproduce the movie audio most satisfactorily without
bothering the user. The signal processing unit 109 adjusts the audio volume 111. Therefore,
when playing back audio data of movie sound, it is possible to automatically adjust the playback
device 10 to a state where the bass sound is emphasized and movie sound with a sense of
presence can be played back.
[0101]
On the other hand, when it is determined in the determination process of step S202 in the
flowchart shown in FIG. 4 that the encoding method of audio data to be reproduced is not the AC3 or DTS method, the system of the reproduction device 10 of this embodiment The control unit
114 estimates that the audio data to be reproduced and used is music audio (step S208).
[0102]
Then, the system control unit 114 determines the number of reproduction channels of audio data
as in the process of step S204 described above (step S209).
09-05-2019
26
Then, as in the process of step S205 described above, the interface control unit 116 causes the
power switches S1L, S1C, S1R, S1LS, S1RS, S1LFE of the speaker amplifier unit 112, and mute
switches S2L, S2C, S2R, S2LS, S2RS, By controlling one or both of the S2LFE, control is
performed on the speaker amplifier according to the number of reproduction channels (step
S210).
[0103]
Next, under the control of the interface control unit 116, adjustment is performed on the audio
signal processing unit 109 so that the bass range of the music sound is not emphasized unlike
the case of reproducing the movie sound (step S211). In the adjustment process performed in
step S211, as described above with reference to FIG. 6, the process of emphasizing the bass is
not performed, or, contrary to the process described above with reference to FIG. This is
processing for adjusting the function of the audio signal processing unit 109 so as to attenuate
and emphasize the treble component.
[0104]
After the process of step S211, as described above, in the case of music voice, since the average
signal level is created relatively high, the audio volume 111 is set to lower the signal level of the
audio signal. It adjusts (step S212).
[0105]
As described above, when it is presumed that the audio data to be reproduced is music audio, the
speaker amplifier unit 112, the audio so as to reproduce the music audio most favorably without
bothering the user. The signal processing unit 109 adjusts the audio volume 111.
Therefore, when the audio data of the music sound is reproduced, the reproduction device 10
can be automatically adjusted to a state where the music sound can be reproduced at an
appropriate volume level without emphasizing the bass too much.
[0106]
Therefore, when the recording medium on which the audio data to be reproduced is recorded is a
09-05-2019
27
DVD, the user's hand is bothered whether the audio data recorded on the DVD is movie sound or
music sound. The reproduction apparatus 10 can be automatically adjusted so that the audio
data can be reproduced satisfactorily without being caused.
[0107]
[Regarding Output Control Process in the Case of CD] FIG. 7 is a flowchart for illustrating the
process executed in step S105 of the flowchart shown in FIG.
That is, the system control unit 114 executes the process shown in FIG. 7 when it is determined
that the recording medium on which the audio data to be reproduced is recorded is a CD.
[0108]
Then, first, as described above, the system control unit 114 determines the signal format of audio
data to be reproduced based on the information from the RF signal processing circuit 106 and
the decoding information from the video / audio decoding unit 107. It discriminates (step S301).
In the process of step S301, the coding method of the audio data to be reproduced and the
sampling frequency are determined.
[0109]
Then, the system control unit 114 determines whether the encoding format of the audio data to
be reproduced is the DTS method based on the determination process of step S301 (step S302).
If it is determined in step S302 that the encoding format of audio data to be reproduced is the
DTS system, the system control unit 114 estimates that the audio data to be reproduced is music
audio. (Step S303).
[0110]
That is, when the audio data encoding method is the DTS method among the digital contents
provided by the CD, the digital contents are hardly so-called spoken speech such as conversation
or rakugo etc. For example, It is often the music voice etc produced by live recording a concert.
09-05-2019
28
[0111]
If the recording medium is a CD and the encoding method of the audio data recorded on the CD
is a DTS method based on this empirical fact, the reproducing apparatus 10 of this embodiment
The audio data recorded on the CD is presumed to be music audio.
[0112]
When the audio data encoding method is the DTS method, in this embodiment, the interface
control unit receives the supply of instruction information from the system control unit 114
because all six speakers are used. As shown in FIG. 5, the power supply 116 turns on the power
supply switches of the speaker amplifiers 112L, 112C, 112R, 112LS, 112RS, and 112LFE
provided for the speakers as shown in FIG.
Also, each mute switch is turned off so that the voice is not muted (step S304).
[0113]
Then, under the control of the interface control unit 116, adjustment is performed on the audio
signal processing unit 109 so that the bass region is not overemphasized as in movie sound
reproduction (step S305).
After this, the interface control unit 116 adjusts the signal level of the music voice whose average
voice level is created relatively high, and the voice volume 111 is adjusted so that the signal level
of the voice data becomes a predetermined level. It adjusts (step S306). Then, the process shown
in FIG. 7 is ended.
[0114]
As described above, when it is estimated that the audio data to be reproduced is the DTS music
audio, the speaker is such that the DTS music audio can be reproduced most favorably without
bothering the user. The amplifier unit 112, the audio signal processing unit 109, and the audio
volume 111 are adjusted. Therefore, when reproducing audio data of DTS-type music audio
09-05-2019
29
recorded on a CD, the reproduction device 10 is automatically set to a state in which the music
audio can be reproduced at an appropriate volume level without emphasizing the bass too much.
It can be adjusted.
[0115]
If it is determined in step S302 that the encoding method of the audio data to be reproduced is
not the DTS method, the system control unit 114 encodes the audio data to be reproduced
according to the LPCM method. It is determined that the sampling frequency has been set, and it
is determined whether the sampling frequency at the time of encoding is equal to or higher than
a predetermined value based on the determination result of step S301 (step S307).
[0116]
In the determination process of step S307, the reproduced voice is degraded even if it is music
information LPCM encoded at a relatively high sampling frequency or a relatively low sampling
frequency in order to obtain a reproduced voice as close as possible to the original sound. Is a
process for determining whether it is a spoken voice such as a small conversation.
[0117]
If it is determined in step S307 that the sampling frequency is equal to or higher than a
predetermined value, the system control unit 114 estimates that the audio data to be reproduced
is music audio that requires reproduction faithful to the original sound. (Step S308).
[0118]
Then, the system control unit 114 determines the number of reproduction channels of audio data
to be reproduced based on the determination result of step S301 (step S309), and similarly to the
processing of steps S205 and 210 of FIG. Depending on the number of playback channels, only
the speaker amplifier corresponding to the speaker to be used is activated, or the audio signal
from the speaker amplifier corresponding to the speaker not in use is muted. Perform (step
S310).
[0119]
Then, in the same way as the processing in step S305 and step S306 described above,
adjustment is performed on the audio signal processing unit 109 so that the bass range is not
overemphasized by the control of the interface control unit 116 (step S311).
09-05-2019
30
The interface control unit 116 also adjusts the audio volume 111 so that the signal level of the
audio data is adjusted to a predetermined level by adjusting the signal level of the music audio
for which the average audio level is generated relatively high. (Step S312).
Then, the process shown in FIG. 7 is ended.
[0120]
As described above, even if it is presumed that the audio data to be reproduced is music sound
other than the DTS method, the music sound can be reproduced most favorably without
bothering the user. The speaker amplifier unit 112, the audio signal processing unit 109, and the
audio volume 111 are adjusted.
That is, the playback device 10 can be automatically adjusted to a state in which the bass can not
be overemphasized and the music sound can be played back at an appropriate volume level.
[0121]
In addition, when it is determined that the sampling frequency is lower than the predetermined
value in the determination processing of step S307, the system control unit 114 causes less
deterioration of the reproduced audio even if the audio data to be reproduced has a relatively low
sampling frequency. It is inferred that it is a spoken voice (step S313).
[0122]
Then, in this case, the voice signal processing unit is configured to increase the signal level of the
voice band in the case of conversation under the control of the interface control unit 116
according to the inference that the voice is from the system control unit 114. Adjustment for 109
is performed (step S314).
[0123]
As described above, even when the voice data to be reproduced is assumed to be speech sound,
the speaker amplifier unit 112 can reproduce speech speech most satisfactorily without
bothering the user. The audio signal processing unit 109 and the audio volume 111 can be
09-05-2019
31
adjusted.
[0124]
Therefore, when the recording medium on which the audio data to be reproduced is recorded is a
CD, the user's hand can select whether the audio data recorded on the CD is music or speech. The
reproduction apparatus 10 can be automatically adjusted so that the audio data can be
reproduced satisfactorily without bothering.
[0125]
[Regarding Output Control Processing in the Case of External Semiconductor Memory] Further,
in the flowchart shown in FIG. 3, when it is determined that the recording medium on which the
audio data to be reproduced is recorded is neither DVD nor CD, The system control unit 114 of
the reproducing apparatus 10 of the embodiment determines that the recording medium on
which the audio data to be reproduced is recorded is the external semiconductor memory loaded
in the memory slot 119.
[0126]
Then, in the reproducing apparatus 10 of this embodiment, it is assumed that the audio data
recorded in the external semiconductor memory is mostly speech speech such as conversation,
and in step S106 shown in FIG. Similar to step S314 shown in, the adjustment process for
satisfactorily reproducing the conversational voice is performed.
[0127]
Then, when the user instructs reproduction of audio data or video data from the optical disc 100
or the external semiconductor memory 120 loaded in the reproducing apparatus 10, as
described above, the adjustment to the audio signal processing unit 109 and the adjustment to
the audio volume 111 Adjustment to the speaker amplifier 112 is performed, and the
reproduction processing is performed in a state most suitable for the audio data to be
reproduced.
[0128]
Thus, even if audio data of different recording media and signal formats are reproduced,
reproduction processing can be performed according to the audio data to be reproduced at any
time, so the user can manually adjust the reproduced audio. Instead, you can always listen to a
good playback sound.
09-05-2019
32
[0129]
Further, as in a home theater system formed by using the playback apparatus 10 of this
embodiment, a two-channel stereo system in a system including five satellite speakers (satellite
channels) and one dedicated bass speaker (bass dedicated channel). In the case of reproducing
the audio data of the above, it is possible to improve the S / N of the reproduction sound field by
muting the channel to which the audio data is not supplied or stopping the operation of the
channel.
This usually improves the S / N of the rear speaker channel, and the noise level of the speaker
closer to the listener can be reduced, so the noise reduction effect in practical use is large.
[0130]
Then, as described above, in the reproducing apparatus 10 according to this embodiment, the RF
signal processing unit 106, the video / audio decoding unit 117, and the system control unit 114
cooperate with each other to set the optical disc loaded in the reproducing apparatus 10. The
medium type and the signal format of audio data are detected.
[0131]
In addition, data reproduction from the external semiconductor memory is also possible. In this
case, the function of the interface control unit detects that the recording medium for audio data
to be reproduced and the external semiconductor memory, and the system control unit Notice to
114.
[0132]
Then, the system control unit 114 estimates the type of audio data to be reproduced based on
the detected or notified medium type and the signal format of the audio data, and the interface
control unit 116 determines the type of the audio data to be reproduced. By controlling the audio
signal processing unit 109, the audio volume 111, and the speaker amplifier 112, output control
suitable for audio data to be reproduced is performed.
[0133]
09-05-2019
33
As described above, the RF signal processing unit 106, the video / audio decoding unit 117, the
system control unit 114, and the interface control unit 116 have functions as medium type
detection means and signal format detection means.
The system control unit 114 also has a function as an estimation unit that estimates the type of
audio data to be reproduced.
The system control unit 114 and the interface control unit 116 have a function as an output
control unit that performs output control according to audio data to be reproduced.
[0134]
Therefore, the signal processing method of the audio data is optimized by controlling the output
of the audio data according to the type of audio data without mounting the large-scale name
circuit in the reproducing apparatus 10 in particular, and the optimum reproduction sound field
Can be realized.
[0135]
The attenuation of the high frequency range component and the low frequency range component
of the audio data performed in the audio signal processing unit 109 depends on the preference
of the user of the reproduction apparatus 10 and the type of audio data, and in the case of any
audio data. It is also possible to set in advance how much treble or bass component is to be
attenuated.
[0136]
Similarly, with regard to the adjustment of the level of audio data performed in the audio volume
111, how much the level of audio data should be raised according to the preference of the user
of the reproduction device 10 and the type of audio data Alternatively, it can be set in advance.
[0137]
Such an adjustment parameter is received by the playback device 10 through the key operation
unit 117, and stored and held in, for example, the EEPROM of the interface control unit 116.
09-05-2019
34
Then, as described with reference to FIGS. 3, 4 and 7, when the adjustment is actually performed,
the adjustment can be performed according to the parameters stored and held in the EEPROM.
[0138]
As described above, the reproduction apparatus 10 is provided with a so-called custom mode in
which output control of audio data is performed in accordance with the user's instruction and the
type of audio data.
In addition, even when the user of the reproduction apparatus 10 of this embodiment does not
use the custom mode, the reproduction apparatus 10 of this embodiment uses the parameters set
in advance at the time of manufacture, etc. It is possible to perform output control of audio data
according to the type of data.
[0139]
[Power Control of External Device] Further, as described above, in the reproducing apparatus 10
according to this embodiment, based on the information recorded in the optical disc or the
external semiconductor memory, the data recorded in the optical disc is audio data. It is possible
to determine whether video data and audio data are recorded.
[0140]
Therefore, it is determined whether or not the content including the video data is to be
reproduced, and in the case where the reproduction of the video data is accompanied and the
power of the video output device 30 is not turned on, the video output device from the
reproduction device 10 is The control signal is sent to 30 to control to turn on the power.
When the video output device 30 is already powered on in the case where the video data is not
played back, a control signal is sent from the playback device 10 to the video output device 30 so
that the power is turned off. Control.
[0141]
09-05-2019
35
Such control is made to connect the playback device 10 and the video output device 30 using a
digital interface or the like of the IEEE 1394 standard.
Then, not only the video data but also control information for controlling power on / off may be
transmitted from the playback device 10 to the video output device 30 through the digital
interface.
[0142]
Therefore, a digital interface is provided in the reproduction device 10 and the video output
device 30, and a control signal for controlling power on / off formed by, for example, the
interface control unit 116 of the reproduction device 10 is transmitted.
Therefore, instead of providing the video D / A conversion circuit on the playback device 10 side,
a video D / A conversion circuit is provided on the video output device 30 side, and according to
the control signal from the playback device 10, A control unit to control on / off will be provided.
[0143]
In this case, the determination as to whether the video output device 30 is powered on or not is
checked between the playback device 10 and the video output device 30 through the digital
interface. You should do it.
In addition, whether or not the playback device 10 turns on the power of the video output device
30 is managed by its own memory, and on / off control of the power of the video output device is
performed according to the information of this memory. You can also.
[0144]
As described above, the type of audio signal to be reproduced can be determined based on the
09-05-2019
36
information recorded in the recording medium, and an optimum reproduction sound field can be
automatically formed. Power on / off control can also be performed.
Further, since the output control (signal processing method) of audio data is optimized based on
the information obtained from the recording medium and the power control is performed, it is
not necessary to provide a special circuit in the reproducing apparatus 10.
[0145]
In the above embodiment, when it is determined that the recording medium is a DVD, the audio
data to be reproduced is determined to be movie audio or music audio. However, the present
invention is not limited to this. Absent.
When a relatively large number of DVD-Audio in which speech data only for speech, such as a
rakugo or a lecture, is recorded is provided, it is determined that the recording medium shown in
FIG. 7 is a CD. Similar to the processing in the above, processing when it is determined to be a
speech can be added.
[0146]
Further, in the above-described embodiment, the reproducing apparatus 10 has been described
as being capable of reproducing three types of optical disks: CD-DA, DVD-Video, and DVD-Audio.
However, it is not limited to this.
Among recording media called CDs, video data such as Video-CD and CD-G are recorded, and new
music CDs such as SA-CD (Super Audio CD) are also provided. It has become
Further, as an optical disc, there is also a large-sized optical disc called an LD (laser disc).
[0147]
09-05-2019
37
As described above, even when a playback apparatus capable of playing back not only CD-DA,
DVD-Video, and DVD-Audio but also other optical disks is configured, the type of each recording
medium, and the recording medium thereof It is possible to specify the type of audio data to be
reproduced based on the information such as the signal format of the audio data and the video
data recorded thereon, and perform output control according to the audio data.
[0148]
In addition, when digital television broadcasting such as satellite broadcasting or a digital audio
broadcasting reception function is installed in an optical disk playback device, it is optimal based
on the difference in the supply path of digital signals and the signal format of received data.
Signal processing to form an optimal reproduction sound field.
[0149]
That is, as audio media for providing audio data, CD-DA, SA-CD, etc. can be reproduced, and as
media for providing audio data and video data, DVD-Video, Video-CD, CD-G, etc. The present
invention can also be applied to a playback apparatus capable of playing back various optical
disks.
[0150]
Further, in the above-described embodiment, although the case where the present invention is
applied to a so-called multi-convertible player capable of reproducing CDs and DVDs has been
described as an example, the present invention is not limited to this.
The present invention can be applied to a single recording medium playback apparatus or
recording / playback apparatus such as a CD player or a DVD player.
That is, in the case of a single recording medium playback device or recording / playback device,
output control of audio data is performed according to the type of audio data to be played back,
optimal signal processing is performed, and optimal playback is performed. It can form a sound
field.
[0151]
09-05-2019
38
Moreover, in the above-mentioned embodiment, although the case where music audio ¦ voice, a
movie audio ¦ voice, and a speech audio ¦ voice were estimated was demonstrated to the
example, it does not restrict to this.
For example, based on the information recorded in the recording medium, it is possible to
determine, for example, whether it is music voice, pop music, or classical music, and perform
output control according to that.
[0152]
Also, output control of audio data can be performed according to the provision status of digital
content provided by the recording medium in the country where the playback apparatus is used.
That is, various parameters for performing output control of audio data are prepared in the
reproducing apparatus according to the estimation result of the type of audio data, and the
parameters to be used are changed according to the country where the reproducing apparatus is
used. You can also
[0153]
DESCRIPTION OF SYMBOLS 100 ... Optical disk, 101 ... Spindle motor, 102 ... Optical pick-up
part, 103 ... Thread motor, 104 ... Motor driver, 105 ... RFEQ amplifier, 106 ... RF signal
processing circuit, 107 ... Video / audio decoding part, 108 ... D-RAM 109: audio signal
processing unit 110: audio D / A conversion circuit 111: audio volume 112: speaker amplifier
113: video D / A conversion circuit 114: system control unit 115: servo circuit 116 ... interface
control unit, 117 ... operation key unit, 118 ... operation display unit, 119 ... memory slot, 120 ...
external semiconductor memory, 20 ... speaker, 30 ... video output device
09-05-2019
39