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JPH0220999

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DESCRIPTION JPH0220999
[0001]
[Outline] For example, a source reproduction unit that outputs a sound field code in
synchronization with a source of an audio device, a sound field code decoding unit that decodes
the sound field code and outputs it as a sound field data signal for setting a sound field A sound
field control device comprising: a sound signal processing unit that changes a source side sound
signal reproduced from a source according to the sound field data signal and outputs the sound
signal as an optimum sound signal corresponding to a desired sound field; It becomes possible to
automatically set the sound field adapted to the source according to the change of the scene of
the source. BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention
relates to a sound field control device for setting a desired sound field. For example, if it is
desired to listen in the room (if it is desired to make the reproduced sound of the audio device as
if it were being heard in a concert hall, church, etc., the above-mentioned sound field control
device is required. PRIOR ART FIG. 4 is a block diagram showing a conventional sound field
control means. For example, compact discs in audio devices, laser discs (hereinafter referred to as
CDs). An audio signal Sm electrically reproduced from a source such as an LD) is generally
amplified by the amplifier 5 and then transmitted from the speaker 6 to space as audio. Although
the space from when voice is transmitted to reach the viewer's ear is generally referred to as the
sound field, when the audio device is set in the room, the viewer only uses the room sound field
regardless of the source scene. I can only taste it. Therefore, conventionally, a digital signal
processor (hereinafter referred to as a DSP) 1 is provided, and various parameters such as delay
constants in the DSP 1 are reset and the source side speech signal Sm is calculated and adapted
to the source. The optimum audio signal Sm 'corresponding to the sound field has been sent to
the amplifier 5. In this way, since the sound field can be controlled according to each scene of the
source, it is possible to enjoy a realistic sound that matches the source even in the room. For
example, the well-known Dolby Surround method is one of the representative methods for
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obtaining this realistic sound. [Problems to be Solved by the Invention] As described above,
conventionally, whenever the scene of the source changes, various parameters in the DSPI, for
example, are manually set to generate the sound field adapted to the source. Therefore, the
following problems occur. That is, it takes time and effort to reset various parameters in the DSPI
according to the source, that is, to change many parameters one by one.
Therefore, it is difficult to apply the conventional sound field control means to a source in which
each scene changes every moment. The present invention has been made in view of the above
problems, and it is a sound field control device that allows the viewer to enjoy a realistic sound
even when each scene of the source changes in a short time And the sound to be output as the
optimum audio signal Sm 'corresponding to the provision of. A voice signal processing unit 4 is
provided. [Means for Solving the Problems] FIG. 1 is a block diagram showing the principle of the
present invention. In addition, description of the amplifier 5 and the speaker 6 (all are FIG. 4) is
abbreviate | omitted. The same components as those described above are denoted by the same
reference numerals. In the sound field control apparatus of the present invention, the source
reproduction unit 2 which reproduces a source such as a CD or LD and outputs a source side
audio signal Sm simultaneously specifies a sound field code which designates a desired sound
field parameter adapted to the source. Output Sc in synchronization with the source. The source
reproduction unit 2 is preferably provided integrally with the sound field code transmitter.
Furthermore, a sound field code decoding unit 3 that decodes the sound field code Sc and
outputs it as a sound field data signal Sd for desired sound field setting, and a source from the
source reproduction unit 2 according to the sound field data signal Sd. Desired sound field by
changing the side audio signal Sm [Operation] In the present invention, the sound field code
stored in advance in the source reproduction unit 2 is synchronized with the source at the time
of source reproduction to the sound field code decoding unit 3. After being sent out and further
decoded in the sound field code decoding unit 3, the sound signal processing unit 4 is sent out as
a sound field data signal Sd. Since the above-mentioned decoding is performed very quickly, in
the audio signal processing unit 4, the source side audio signal Sm is changed according to the
change of each scene of the source by the sound field data signal Sd to obtain the optimum audio
signal Sm '. Can. Thus, according to the present invention, even if each scene of the source
changes, only by sending out the sound field code, a sound field adapted to the source can be
automatically generated. This makes it possible to experience the realism without taking time and
effort. FIG. 2 is a block diagram showing an embodiment of the present invention. Here, a sound
field control apparatus using an LD as a source is shown as a representative example. In this
case, the series of sound field codes Sc are preferably recorded in advance in the LD together
with the series of source side audio signals Sm and the video signal Sv. The above three types of
signals are collectively reproduced simultaneously from the source reproduction device 20
formed integrally with the LD and output as an electric signal.
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In the above series of sound field codes Sc, data corresponding to each scene of the source is
recorded as a code in index numbers etc. In order to send out the sound field codes Sc into the
sound field code decoding unit 3, It is practically preferable to input to the sound field code
storage unit 21 composed of ROM and the like. Further, a sound field data converter 30 is
provided which converts sound field data signals Sd having sound field parameters respectively
corresponding to the series of sound field codes Sc. Furthermore, the audio signal processing unit
4 changes the source side audio signal Sm according to the magnitude of the analog voltage of
the sound field data signal Sd, or the source type audio signal according to the code data of the
sound field data signal Sd. A digital type audio signal processor 40 such as a DSP that changes
Sm, and a source side and amplifier side switching switch that selects whether to process the
source side audio signal Sm according to the presence or absence of the sound field data signal
Sd 41 and 42. It is desirable that the switching control of the changeover switches 41 and 42 be
performed by a switching control signal Ss simultaneously output from the sound field data
converter 30 with the sound field data signal Sd. In addition, the display part 22 which displays
each scene of a source by video signal Sv is provided here. FIG. 3A is a flow chart showing the
source reproduction operation of this embodiment, and FIG. 3B is a flow chart showing the sound
field control operation. The operation of the present embodiment will be described according to
these flowcharts. In FIG. 3A, first, the power switch of the entire sound field control device is
turned on (step a). Next, the source reproducing unit 20 is operated to reproduce the source side
audio signal Sm, the video signal Sv and the sound field code Sc from the LD (step b, step c3 step
C ?, step C ? ?). Among these signals, the video signal Sv is sent to the display unit 22 and
immediately displayed as a video (step d), while the source side audio signal Sm and the sound
field code Sc are the audio signal processing unit 4 and the sound field code storage unit 21 are
sent (step e1 step e L). In FIG. 3B, the sound field code Sc is input to the sound field code storage
unit 21 (step f). Further, the sound field code Sc temporarily stored in the sound field code
storage unit 21 is extracted and input to the sound field data converter 30. Sound field
parameters are recorded in advance in the sound field data converter 30, and sound signals are
converted one after another into sound field data signals Sd having sound field parameters
respectively corresponding to the respective codes of the sound field codes Sc It sends to the
processor 40 (step g).
At the same time, according to whether or not the sound field data signal is output (step h), the
switching control signal Ss is sent from the sound field data converter 30 to the source side and
the amplifier side switching switches 41, 42. If the sound field data signal 4Sd is output, the
switching control signal Ss is also output, and the switching switch 41, 42 is connected to the a
side (the audio signal processor 40 side) (step i). After setting the sound field parameters
automatically in the inside, the source side audio signal Sm is calculated and synthesized to
generate a sound field suitable for the source (step k), and the sound field data signal sd must be
output. For example, the switching control signal Ss is not output, and the source side audio
signal Sm, which is connected to the switch b and not processed at all, is output as it is, and the
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sound field control is not performed. Further, it is determined whether the process has been
completed to the end depending on whether the audio signal Sm is output (step e). While the
source side audio signal Sm is being output, the above-described source reproduction operation
and sound field control operation are repeated. When the output of the audio signal Sm stops, all
operations are completed at this point. Here, the source-side audio signal Sm, the video signal Sv
and the sound field code signal Sc are all reproduced simultaneously, and the processing time for
generating the sound field of the audio signal Sm is very fast. It is sufficiently possible to
generate a sound field adapted to the image. [Effects of the Invention] As described above,
according to the present invention, a sound field control system capable of automatically setting
a sound field adapted to each scene of a source such as an audio apparatus can be realized. The
viewer can have a realistic sound for all scenes of the source without spending extra setup time.
[0002]
Brief description of the drawings
[0003]
FIG. 1 is a block diagram showing the principle configuration of the present invention, FIG. 2 is a
block diagram showing an embodiment of the present invention, FIG. 3A is a flowchart showing
source reproduction operation, and FIG. 3B shows sound field control operation. FIG. 4 is a block
diagram showing a conventional sound field control means.
2 иии Source reproduction unit, 3 и и и Sound field code decoding unit и и и Audio signal processing
unit, 201 и и и Sound field code storage unit Converter, 0 ... audio signal processor. Source
regeneration device
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