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JP2001078290

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DESCRIPTION JP2001078290
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an
apparatus for automatically setting a sound field reproduction environment effective for an audio
system for reproducing audio signals of two or more channels, such as a digital video disc (DVD)
system and an audio system. The present invention relates to a speaker device compatible with
this device.
[0002]
2. Description of the Related Art As a conventional digital audio system technology, there is a
technology described in Japanese Patent Application Laid-Open No. 10-334650.
[0003]
FIG. 4 shows a schematic configuration of a sound reproduction system in the 5.1 channel
compatible DVD player 1.
A Dolby Digital (registered trademark) signal (5.1 channel) read from the optical disk 2 in the
DVD format is input to the signal processing circuit 3, amplified, and input to the Dolby Digital
decoder 4. Here, decoding processing corresponding to the Dolby method is performed, and the
decoded 6 series of signals (L; left) (R; right) (C; center) (SL; rear left) (SR; rear right) (SW) The
subwoofer is input to the configuration filter 5. The output of the configuration filter 5 is
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converted to an analog signal in the digital-to-analog converter 6 and supplied to the amplifier
10. And for the amplifier 10, ideally, six speakers 22a, (L; left), 22b (R; right), 22c (C: center), 22d
(SL; rear left), 22e (SR; rear) Right), 22f (SW; subwoofer) is connected.
[0004]
The microcomputer 8 controls the operation of the signal processing circuit 3, the Dolby Digital
Decoder 4 and the configuration filter 5 based on the information of the key input unit 7 and the
disk.
[0005]
Here, Dolby Digital is a digital application of a Dolby Surround system, which is a digital disc
such as a DVD in which data of five basic channels L, R, C, SL, SR are recorded.
Some discs may have data for SW (subwoofer) channels that have low frequency components
such as LFE in addition to the above basic 5 channels, but this component has no data amount
for one channel Because those with 0.1 channel are called Dolby Digital (5.1 channel).
[0006]
The addition of LFE is performed by a circuit called a configuration filter 5, and as a result of the
addition, the configuration filter 5 outputs six channels of L, R, C, SL, SR, and SW. When there is
no LFE, the output is 5 channels excluding SW.
[0007]
Next, the configuration filter 5 will be described.
[0008]
The configuration filter distributes low-range sound to each speaker according to the system
configuration of an individual such as the presence or absence of an SW (subwoofer) speaker
connected to the receiver and the size of the aperture of the L and R speakers. It is a filter.
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[0009]
That is, when there is an SW speaker, or when there is no speaker, when the aperture of the L
and R speakers is large and the low range can be reproduced, or when the aperture is small and
the low range reproduction is insufficient, etc. It is a filter that can appropriately change the
distribution of low frequency components to
[0010]
5 to 8 show configuration examples of six types of configuration filters.
FIG. 5 shows type A (suitable for small L and R speaker apertures), and FIG. 6 shows type B
(suitable for small L and R loudspeaker apertures and small LS, LR and C speaker apertures).
FIG. 7 shows Type C-1 and Type C-2 with or without the subwoofer.
In FIG. 8, the selection state of the switch 67 changes depending on whether the aperture of the
L and R speakers is small or not, and the type becomes D-2 or D-1. There is also a type E as a
type that outputs 6 channels of input as it is.
[0011]
The configuration filter of FIG. 5 passes high-pass filters 31, 32, 33 for passing L, C, R, LS, LR
input middle high frequency components to produce L, C, R, LS, LR outputs. , 34, 35. The L, C, R,
LS and LR inputs and the LEF input are input to the adder 36. The adder 36 adds the L, C, R, LS
and LR inputs at 0 dB and the LEF input at +10 dB. The output of the adder 36 is derived as a
subwoofer (SW) output via the low pass filter 37.
[0012]
The configuration filter shown in FIG. 6 includes an adder 41 supplied with an L input, a high
pass filter 43 supplied with a C input, an adder supplied with an R input, and a high pass filter 44
supplied with an LS input. , And an adder 47 supplied with an LE input, an LEF input, a C input,
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an RS input, and an LS input. The adder 47 adds the C, LS, and RS inputs at 0 dB and the LEF at
−10 dB. The output of the adder 47 is further attenuated by 4.5 dB by the attenuator 48
through the low pass filter 46 and input to the adders 41 and 42.
[0013]
The configuration filter shown in FIG. 7 includes an adder 51 supplied with an L input, a high
pass filter 52 and a low pass filter 53 supplied with a C input, an adder 53 supplied with an R
input, and an LFE input. Switch 55, an adder 57 supplied with the LS input, and an adder 58
supplied with the RS input.
[0014]
The output of the low pass filter 53 is attenuated by 4.5 dB by the attenuator 54 and supplied to
the adders 51 and 53.
The adders 53 and 51 are supplied with one selection output of the switch 55. The output of the
adder 51 is derived as L output, and the output of the adder 53 is derived as R output. The
output of the high pass filter 52 is derived as the C output.
[0015]
The other selected output of the switch 55 is amplified by an amplifier 56 and derived as an SW
output. The LS input and the RS input are input to adders 57 and 58, respectively, where they are
added to one of the outputs selected by the switch 55. The outputs of the adders 57 and 58 are
derived as the LS output and the RS output.
[0016]
In the configuration filter of FIG. 8, the L input is input to the adder 61, the C input is derived
through the high pass filter 62, and the R input is input to the adder 63. The LS input is also
derived via a high pass filter 64 and the RS input is derived via a high pass filter 65. The C input,
RS and LS inputs are input to the adder 66 and added, and the added output is attenuated to -4.5
dB and then input to the switch 69 through the low pass filter 68. One selection output of the
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switch 69 is input to the adders 61 and 63, and the other selection output is input to the adder
72 via the -10.5 dB attenuator. The adder 72 is supplied with an LFE input via an attenuator 71
of -5.0 dB. The output of the adder 72 is derived as the SW output.
[0017]
As described above, there are various types of configuration filters, and there are types that are
adapted according to the setting state of the speaker system and the characteristics of the
speaker.
[0018]
Referring back to FIG.
Specifically, when there is no SW among the above six types, the configuration filter 5 is either
type B, type C-1 (group A), or D-1 (when the playback device is a DVD). Is selected. When there is
an SW, either type A, type C-2 (group A) or type D-2 (if the playback device is a DVD) is selected.
Here, although there is a group A, the group is a rank division of so-called digital audio systems,
and the group A means high performance, the group B is a popular product, and the group C
means for car use and portable. The DVD is a configuration filter for DVD.
[0019]
A preferable correspondence between the above six types of configuration filters and speakers is
as shown in FIG. There is also type E, in which case channels L, R, C, LS, and RS are selected when
they are full band.
[0020]
As described above, there are appropriate types of configuration filters depending on the speaker
system (number, size, characteristics, etc. of speakers) to be used. Conventionally, the user selects
and sets this type of configuration filter according to the situation.
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[0021]
However, in this setting, the user needs to make complicated settings in accordance with the
number, size and characteristics of the speakers, which is bothersome and troublesome for
unaccustomed users. Such factors hinder the spread of multi-channel speaker systems.
[0022]
Therefore, the present invention is to provide an automatic setting device for sound field
reproduction environment and its speaker device capable of automatically setting optimum
characteristics according to the speaker using the characteristics of the configuration filter. It is
the purpose.
[0023]
The automatic setting apparatus for sound field reproduction environment according to the
present invention comprises a decoder for decoding audio signals of a plurality of channels, a
configuration filter to which the output of the decoder is supplied, and A network interface for
outputting the output of the configuration filter to the network in a predetermined format,
arrangement information of at least individual speakers sent from the m speakers arranged in
the network, and arrangement information of each of the m speakers And means for
automatically setting the characteristics of the configuration filter so that the audio signals of the
plurality of channels are adapted to the speaker.
[0024]
By the above means, a general user does not have to set the characteristics of the configuration
filter by looking at the situation of a plurality of speakers.
In addition, even when there are additions or reductions of speakers, it becomes possible to
easily filter acoustic signals of a plurality of channels so as to be suitable for the speaker
environment.
[0025]
According to another aspect of the present invention, there is provided a speaker device
comprising: an interface for a network; an analog conversion unit for data taken in via the
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interface; a speaker unit for acoustically converting an output of the analog conversion unit; A
characteristic data unit including at least one of the lowest resonance frequency, the number of
speaker units, the speaker unit size, the arrangement position information, etc., and means for
transmitting the data of the characteristic data unit to the network via the interface .
[0026]
When it is going to set up a sound field environment automatically by the above means, it is
possible to transmit the characteristic information of oneself to the control section of the center.
[0027]
DETAILED DESCRIPTION OF THE INVENTION Embodiments of the present invention will be
described below with reference to the drawings.
[0028]
FIG. 1 shows an embodiment of the present invention.
This is an example applied to a sound reproduction system in a 5.1 channel compatible DVD
player, and shows a schematic configuration thereof.
A Dolby Digital (registered trademark) signal (5.1 channel) read from the optical disk 2 in the
DVD format is input to the signal processing circuit 3, amplified, and input to the Dolby Digital
decoder 4.
Here, decoding processing corresponding to the Dolby method is performed, and the decoded 6
series of signals (L; left) (R; right) (C; center) (SL; rear left) (SR; rear right) (SW) Subwoofer) is
input to the configuration filter 100.
The output of the configuration filter 100 is input to the formatter 101 and arranged in the
format of the transmission system. The data stream output from the formatter 101 is input to the
network interface 103 and output to the transmission line 200.
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[0029]
A speaker system is connected to the transmission line 200. The speaker system includes, for
example, six speaker devices 201 (L; left), 202 (R; right), 203 (C; center), 204 (SL; rear left), 205
(SR: rear right), 206 It consists of (SW; subwoofer).
[0030]
The configuration of the speaker device of the present invention is, for example, as shown in FIG.
2, which will be described later. The speaker apparatus can return data (speaker information)
owned by itself via the transmission line. Returning to FIG. 1, the speaker information is taken in
via the network interface 103, decoded by the deformatter 104, and taken into the
microcomputer 105. The microcomputer 105 analyzes the speaker information and sets the
characteristic of the configuration filter 100 to the optimum characteristic at present.
[0031]
Further, the microcomputer 105 controls the operation of the signal processing circuit 3 and the
Dolby Digital Decoder 4 based on the information of the key input unit 106 and the disk 2.
[0032]
In FIG. 2, one speaker device 201 will be described as a representative.
[0033]
The transmission line 200 is connected to the network interface 211.
The network interface 211 separates and derives the data transmitted to its own speaker device
and supplies it to the digital analog converter 212.
The signal converted here is amplified by the amplifier 213 as an audio output and supplied to
the speakers SP1 and SP2. A characteristic data unit 214 and a key input unit 215 are connected
to the network interface 211.
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[0034]
Characteristic data portion 214 stores characteristic data of the speaker. The characteristic data
includes frequency response characteristics (total characteristics of all amplifier units and
speaker units), minimum resonance frequency, number of speaker units, unit size of individual
speakers, and the like. Further, arrangement information (L, C, R, LS, LR) is given from the key
input unit 215. The information may be input from the key input unit 215 when there is an
upgrade of the speaker device, for example, an addition of a speaker unit, a change of an
amplifier, or the like. The speaker information is sent to the transmission line 200 via the
network interface 211 when there is a request from the connection device, for example, via the
transmission line, or when the speaker device is connected to the network. Transmission of
information can be appropriately performed in a format such as packet transmission, and a
predetermined standard may be adopted.
[0035]
The above-mentioned speaker information is taken in from each speaker device via the
transmission line 200 to the network interface 103 of the terminal device of FIG. The speaker
information from the network interface 103 is decoded by the deformatter 104. Based on this
information, the microcomputer 105 determines the current speaker environment, and
determines the filter type of the configuration filter 100 that is optimal for the environment.
[0036]
FIG. 3 is a flow chart for explaining the analysis operation of the speaker information.
[0037]
In step S1, it is determined whether there is a subwoofer (SW) speaker.
Next, if there is an SW speaker, it is determined in step S2 whether the left (L) and right (R)
speakers are large. If there is no SW speaker, it is determined in step S3 whether the rear left (LS)
and right (RS) speakers are large.
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[0038]
For example, the following method may be used to determine the size of the speaker. The
frequency value of the -3 dB point on the low frequency side of the frequency response
characteristic is compared with the specified value, and if the value of the speaker device falls
below the specified value, the speaker is judged as a large speaker capable of reproducing to the
low frequency Do. Otherwise, it is judged as a small speaker and the process ends.
[0039]
Further, the frequency value of the -6 dB point on the high frequency side of the frequency
response characteristic is compared with the specified value, and if the value of the speaker
device falls below the specified value, the speaker is determined to be SW. In the other cases, it is
determined that the speaker of each channel. When judging a speaker size from a frequency
response characteristic, it may be made to have versatility by judging using fuzzy logic.
[0040]
Also, instead of the frequency response characteristic, information of the lowest resonance
frequency (f0) or the number of speaker units and each size may be used.
[0041]
Referring back to FIG.
If it is determined in step S2 that the L and R speakers are large, the configuration filter 100 is
set to type A (step S7). If it is determined in step S2 that the L and R speakers are small, it is
determined whether the playback device is a DVD (step S4). If the playback device is a DVD, the
configuration filter 100 is set to type D-2 (step S5). If the playback device is not a DVD, the
configuration filter 100 is set to type C-2 (step S6).
[0042]
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If it is determined in step S3 that the loudspeakers LS and RS are small, the configuration filter
100 is set to type B (step S11). If it is determined in step S3 that the speakers LS and RS are
large, it is determined whether the playback device is a DVD (step S8). If the playback device is a
DVD, the configuration filter 100 is set to type D-1 (step S9). If the playback device is not a DVD,
the configuration filter 100 is set to type C-1 (step S10).
[0043]
As described above, according to the present invention, the characteristics of the configuration
filter 100 can be automatically set even in a multi-channel speaker system.
[0044]
In the above system, an example of setting the characteristics of the configuration filter in the
DVD player has been described, but the device serving as the signal source is not limited to the
DVD player.
The concept of the present invention is applicable to various devices. The transmission line may
be a coaxial cable, an optical cable, or wireless. As the network, various types such as serial type
and star type are selected. Also, depending on the transmission type, the transmission and
reception forms of the interface are selected as appropriate. Further, for re-speaking of the
speaker information, for example, a reset and re-capture command of the speaker information
may be transmitted from the key input unit 106.
[0045]
As described above, according to the present invention, an apparatus for automatically setting a
sound field reproduction environment capable of automatically setting optimum characteristics
according to the speaker using the characteristics of the configuration filter. And the speaker
device can be provided.
[0046]
Brief description of the drawings
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[0047]
1 is a diagram showing an embodiment of the present invention.
[0048]
2 is a configuration explanatory view of a speaker device according to an embodiment of the
present invention.
[0049]
3 is a flowchart shown to explain the operation of the device of the present invention.
[0050]
4 is an explanatory view of a speaker system in the DVD player.
[0051]
FIG. 5 is a diagram showing type A of the configuration filter.
[0052]
6 is a diagram showing the type B of the configuration filter.
[0053]
FIG. 7 is a diagram showing types C1 and C2 of the configuration filter.
[0054]
FIG. 8 is a diagram showing types D1 and D2 of the configuration filter.
[0055]
9 is a diagram showing an example of the type of configuration filter and the corresponding
speaker system.
[0056]
Explanation of sign
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[0057]
DESCRIPTION OF SYMBOLS 100 ... Configuration filter, 101 ... Formatter, 103 ... Network
interface, 104 ... Deformatter, 105 ... Microcomputer, 106 ... Key input part, 200 ... Transmission
line, 201-205 ... Speaker apparatus.
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