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The present invention relates to a reproduction system including an audio signal distribution
server and an communicable audio reproduction terminal apparatus, and the audio reproduction
terminal apparatus, wherein the technology relating to the reproduction operation of two audio
signals, more specifically In particular, by reapplying the insufficient frequency band signal to
the original sound of the audio signal recorded on a compact disc (CD) or the like, the processing
method and apparatus for approximating the original sound and reproducing it and the use of
the method network Related to providing in a simpler way.
2. Description of the Related Art In a digital audio signal reproduction apparatus such as a CD,
frequency components can not be reproduced at more than half of the sampling frequency. For
example, the sampling frequency of the CD is 44.1 kHz, high frequency components of 20 kHz or
more are removed, and a digital audio signal converted to a digital signal is recorded on the CD.
As a result, an acoustic signal of 20 kHz or more emitted from an actual musical instrument is
removed, and the sound reproduction at the time of playing a CD gives the impression of a
characteristic closing feeling or metallic sound in terms of sound quality.
Human beings are not able to hear sounds above 20 kHz in the frequency band, and the
sampling frequency of CDs that can record up to 20 kHz came from this idea, but in recent
research, humans recognize sounds above 20 kHz And the results show that the harmonic
component has an important influence on the reproduced sound quality in the audible range.
Furthermore, based on the reflection on the impression of a sense of blockage and metallic sound
unique to CDs as mentioned above, sampling frequencies that can be recorded up to around 100
kHz, such as SACD and DVD audio, have recently been standardized. Formats etc. have appeared.
In addition, products such as regenerators, amplifiers and loudspeakers compatible with the
same format are being put on the market one after another.
However, CDs, which are standards that cut 20 kHz or more, have already been sold with billions
of copies all over the world and are being used for viewing, and to reproduce CDs more faithfully
to original sound, many people create various inventions It is carried out. Then, as described in
JP-A-9-36685 as a technology for adding a frequency band of 20 kHz or more to reproduction
sound such as CD in order to solve such a problem, an audio frequency band of reproduction
frequency band It has been proposed to add a noise component equal to or similar to the
frequency band exceeding the upper limit of the upper range of T.sub.2 in conjunction with the
reproduction frequency band for addition and reproduction.
In JP-A-9-307385, means for generating harmonics based on the signal extracted from the
reproduction acoustic signal and further generating noise to cause time delay between both
signals and add all four signals is suggesting.
The method described in the above-mentioned Japanese Patent Application Laid-Open No. 936685 is a method of adding to the original sound signal a noise component having a spectrum
approximating a spectral component of 20 kHz or more dropped for sampling at the time of
recording on a CD.
Many of the signal components in the high frequency band above the human audible range are
generated from factors such as tapping, rubbing, and blowing, and it is assumed that random
noise components similar to this are used.
Also, the method described in the above-mentioned Japanese Patent Application Laid-Open No. 9307385 creates a state where noise components are always added by further shifting the noise
components on the time axis.
However, according to the method described in Japanese Patent Laid-Open No. 9-36685, in the
music mode in which a plurality of musical instruments are played, the acoustic components of
the musical instruments are collectively combined. It is a process, and it can not be said that it is
originally an original sound, and it is a method of processing an acoustic signal.
When it comes to bringing it closer to the original sound, it is most effective to add a harmonic
component beyond the audible range to the sound or sound signal generator used for music
reproduction, that is, to musical instruments, natural sounds and human voices individually. It is
considered to be. The harmonic components include some that are emitted depending on the
type of the instrument, and some that do not emit, and even those that are emitted have spectral
components inherent to the instrument. For example, violins have spectral components of up to
60 kHz, cymbals, maracas, hi-hats, etc. up to about 100 kHz, bells, tambourines, etc. have
spectral components of 100 kHz or more. It has been confirmed that natural sounds contain
many harmonic components such as flowing water, waves, and swaying leaves. I think that
adding the harmonic component of each sound source used for music leads to faithful original
sound reproduction.
Furthermore, a method characterized by using a noise component similar to the random noise or
a random noise as a signal to be added to the original audio signal as a signal to be added to the
original sound signal described in Japanese Patent Application Laid-Open No. 9-36685
mentioned above By shifting the noise component on the time axis as described in JP-A-9307385, the noise component is always added.
However, this noise component is also the generation of a pseudo-acoustic signal similar to the
harmonics of the musical instrument sound and is not faithful to the original sound.
Therefore, in order to generate a signal that conforms to the original sound, a signal with a highfrequency component of 20 kHz or more that is lost in sampling is extracted from the master
tape when digitizing a master tape recording musical instrument performance or music to CD.
Reattach When pressing a large number of CDs, make a master tape. Although this master tape
varies depending on the recording equipment, frequency components of 20 kHz or more are also
recorded. A music signal of 20 kHz or more which is dropped when the master tape for CD
recording is created is again digitally recorded through, for example, a hard disk drive (HDD)
through a high pass filter, accumulated for each CD, and put into a database. The database is
stored in the host computer, downloaded to the HDD of the audio playback device with a storage
device using communication means such as the Internet, played back in synchronization with CD
playback, and an audio signal up to 20 kHz recorded on the CD An acoustic signal of 20 kHz or
more is simultaneously reproduced, and signal reproduction as close as possible to the sound
source recorded on the master tape including the ultra-wide range sound source is performed.
The present invention has been made in view of the above problems, and the object of the
present invention is to add a high frequency component higher than the audio band originally
present to the reproduced sound when reproducing the audio of the compact disc (CD). And
providing an audio reproduction processing method and an audio reproduction processing
apparatus capable of improving the reproduction sound quality.
SUMMARY OF THE INVENTION In order to achieve the above object, the present invention
provides a reproduction means for reproducing an audio signal of a compact disc, and a
communication for connecting to an external host computer using a public line. A connecting
means, a reproducing apparatus for reproducing a compact disc, a storage device for storing
acoustic signals, a signal generator for synchronizing a plurality of acoustic signals, and the
plurality of synchronized acoustic signals into one acoustic signal A mixer unit is provided, and a
signal path for outputting an acoustic signal from the mixer unit.
Further, according to the present invention, the high-band sound signal of the sound signal
recorded on the compact disc is accumulated in the storage device by the communication
connection means, synchronized with the reproduction of the compact disc by the signal
generator, and the storage A broadband acoustic signal stored in the device is reproduced.
BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be
described below with reference to the drawings.
FIG. 1 shows an outline of the entire audio signal distribution system according to the present
This audio signal distribution system basically allows digital transmission via a public
communication network such as the public telephone network 3, CATV network 4 or satellite
broadcasting circuit 5 connected to the external host computer 2 at a large capacity at high
speed at home. It is performed by the sound reproducing apparatus 1 used by connecting to a
The host computer 2 can be considered as a form in which all the data are collected into one
server, or, for example, a form in which a plurality of servers are provided for each copyright
holder (for example, a record company) (2 ', 2 ").
The sound reproducing device 1 is connected to the amplifier 6 and the speaker 7 and amplifies
the sound signal.
FIG. 2 is a block diagram showing the configuration of the sound reproducing apparatus 1.
The sound reproducing apparatus 1 according to the present invention includes a controller 8, a
communication interface 9, a CPU 10, a ROM 11, an input / output interface (I / O interface) 12,
an operation unit 13, a display 14, a CD drive 15, a DA converter 16, A hard disk drive (HDD) 17,
a DA converter 18, a signal generator 19, a digital mixer 20, and a mixer 21 are included.
The controller 8 connects to the host computer 2 via a public communication network such as
the public telephone network 3, the CATV network 4 or the satellite broadcasting circuit 5.
The following description will be given in a form in which the sound reproducing device 1 is
connected to the host computer 2 via the public telephone network 3.
The controller 8 controls the entire sound reproducing apparatus. A control unit for executing
the process according to the present invention, which is communication means, a communication
interface 9, a CPU 10, a ROM 11, an I / O interface 12, a display 14, and a signal generator 19
are connected via a bus 22.
The communication interface 9 transmits / receives data to / from the host computer 2
connected via the public telephone network 3, transmits a request for ultra-wide area music
information to the host computer 2, and transmits a request CD downloaded from the host
computer 2. Receive wide area music signals and information.
The CPU 10 controls the entire controller 8, controls the CD drive 15, stores and reads ultrawide-area music signals in the HDD 17 by the I / O interface 12, and communicates with the
communication interface 9 based on operation information input from the operation unit 13. The
host computer 2 is accessed via the public telephone network 3, and download of the ultra-wide
area music signal corresponding to the CD inserted in the CD drive 15 is controlled.
The ROM 11 is a read only memory that stores programs for the CPU 10 to execute various
The I / O interface 12 controls input of operation information from the operation unit 13, and
controls storage and readout of the ultra-wide-area music signal to the HDD 17.
The operation unit 13 is an input means having operation keys for inputting various operation
information such as an operation transmission instruction for capturing a very wide area signal
by the user, an operation of a cancellation instruction, and character information of a CD to the
display 14. is there.
The HDD 17 is storage means for writing and reading out ultra-wide area music signals on a
medium such as a hard disk or an optical disk.
The display 14 displays character information such as the song title of the CD inserted into the
CD drive 15 and the playing time.
The CD drive 15 reproduces a normal music CD.
Also, it can be a DVD drive or SACD drive that can play music CDs.
Two digital audio output signals from the CD drive are output, one of which is input to the DA
converter 16 and one of which is input to the digital mixer 20.
The DA converter 16 converts the digital signal of the CD drive 15 into an analog signal and
outputs it.
The DA converter 18 converts the digital ultra-wide-area acoustic signal stored in the HDD 17
into an analog signal and outputs it.
The signal generator 19 synchronizes the playing time signal of the CD reproduced by the CD
drive 15 with the playing time signal of the ultra-wide area music signal stored in the HDD 17.
The digital mixer 20 combines two systems of a signal output from the CD drive 15 and a digital
audio signal output from the HDD 17 into one system, and outputs a digital audio signal.
The mixer 21 combines two systems of an analog audio signal output from the CD drive 15 via
the DA converter 16 and an analog audio signal output from the HDD 17 via the DA converter 18
into one system, and converts the analog audio signal Output.
A bus 22 is a data communication line for exchanging various data between the above-described
The host computer 2 stores, for each CD, ultra-wide-area music signals of CDs already produced
and sold.
Character information on the music shown in FIG. 3 is stored.
The user inserts the compact disc owned by the CD drive of this device, selects the ultra-wide
mode from the operation unit when the ultra-wide signal is desired, and when acquiring a new
ultra-wide signal, the host via the communication interface It is connected to a computer, the
data of the corresponding ultra-wide area music signal is retrieved, the download is executed,
and the ultra-wide area music signal is accumulated in the HDD.
The flow of the whole process of this embodiment is shown by FIG.
First, the CD owned by the CD drive 14 is loaded (S10).
The display 13 displays a message as to whether or not reproduction in a very wide area is
desired. If the user does not desire reproduction, the CD is reproduced as it is.
When desired is selected, the communication interface 7 is activated, and a connection screen for
designating URL input of the host computer 2 storing the ultra-wide area music signal is
displayed, and the URL is input there (S12).
In order to receive this service, complete user registration and membership registration in
advance, and make it a membership system.
When connection with the host computer 2 is established, the host computer 2 requests
confirmation of the membership number and password, and the membership number and
password are input (S13).
Once the membership number and password have been authenticated, the ultra-wide-area music
signal data, track number and music playing time information corresponding to the loaded CD
are automatically downloaded (S14).
After the download is completed, the end of download is displayed on the display 13. By playing
back the CD, the playing time information of the CD and the playing time information of the
ultra-wide area music signal are synchronized, and the two music signals are played back at the
correct timing. (S15).
As described above, according to the present invention, an ultra-wide-area audio signal of 20 kHz
or more, which is not recorded on the existing CD but greatly contributes to the improvement of
the audibility, is added to the hand-held CD. Enables high-quality sound reproduction easily.
If you want high-quality playback of CD or more, you must purchase a new media that complies
with SACD and DVD audio standards, but with the present invention, users can use high-quality
audio playback with a hand-held CD. It will be realized.
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