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JPH0564898

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DESCRIPTION JPH0564898
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a
DSP reproduction control apparatus improved to reduce the sense of incongruity in hearing at
the time of switching the sound field reproduction mode.
[0002]
2. Description of the Related Art A conventional digital signal processor (DSP) reproduction
control apparatus has a configuration shown in FIG. In the figure, 1 is an A / D converter, 2 is a
DSP processing unit, 3 is a microcomputer, 4 is a keyboard unit, 5 and 6 are D-RAMs as
memories, 7 and 8 are D / A converters, 9 and 10 Is an electronic volume.
[0003]
An input stereo reproduction sound signal (analog signal) is converted into a digital signal by an
A / D converter 1 and input to a DSP processing unit 2. Data such as programs and coefficients
sent from the microcomputer 3 are stored in D-RAMs 5 and 6 incorporated in the DSP processing
unit 2 according to a predetermined reproduction sound field mode set or switched by the
keyboard unit 4 ing. Therefore, the DSP processing unit 2 performs DSP processing on the digital
signal so as to obtain a direct sound, an initial reflection sound and a reverberation sound
according to the reproduction sound field mode according to the program and coefficient data,
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Get The DSP-processed digital signal is converted into an analog signal by the D / A converters 7
and 8 and output to an ordinary audio reproduction unit (not shown) through the electronic
volume control 9 and 10.
[0004]
The problem with the above-described conventional DSP regeneration control apparatus is that,
since DSP processing must download programs and coefficients to the RAM, the DSP The point is
to mute the signal. That is, first, when power is supplied to the device at the time of setting the
reproduction sound field mode, it is necessary to download the program and coefficients of the
initial mode or the mode being backed up to the RAM. The time playback output sound will be
interrupted.
[0005]
Next, when the playback sound field mode is switched, for example, the room mode is switched
as "Disco" → "Hall" → "Church" → "Stadium" → "Surround" → "Hall". In the process of
downloading, it is necessary to carry out the process of downloading each time, but during the
process of downloading, since the DSP signal contains noise etc., the electronic volume 9, The
muting process of the above signal is performed by sending muting signals S1 and S2 to step
S10. For this reason, although the input reproduction sound signal is added from the tape player
or the CD player, the mute processing is performed during the download, the reproduction sound
is interrupted, and the interruption time of the reproduction sound is compared Because it is
long, listening to the playback sound is quite uncomfortable in hearing.
[0006]
An object of the present invention is to propose a DSP reproduction control apparatus having a
configuration for reducing the sense of incongruity in hearing caused by performing mute
processing at the time of setting or switching of such reproduction sound field mode.
[0007]
SUMMARY OF THE INVENTION In order to achieve the above object, the present invention has a
function of setting or switching a predetermined reproduction sound field mode, and at the time
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of the switching, a sound field which outputs a mute signal for a predetermined time. A mode
setting switching means, and a DSP processing means for outputting a sound field corrected DSP
signal for generating a direct sound, an initial reflection sound and a reverberation component
from an input reproduction sound signal according to the reproduction sound field mode; And a
voice reproduction means for playing the voice of the DSP signal or interrupting the voice
reproduction in response to the mute signal. At the time of setting or switching, output control
means is provided to control the input reproduction sound signal to be reproduced directly from
the sound reproduction means without passing through the DSP processing means. It is
characterized in.
Further, in the above apparatus, when the input reproduction sound signal is directly output
from the sound reproduction means at the time of switching the reproduction sound field mode
by the output control means, the sense of incongruity in the aural sense is reduced. Attenuating
means may be provided for attenuating to a level as desired. Alternatively, in each of the abovedescribed devices, activation detection control means may be provided for detecting activation of
the DSP processing means and activating the output control means at the time of activation
detection.
[0008]
In the DSP reproduction control apparatus of the present invention, the input reproduction sound
signal is directly reproduced without mute processing from the sound reproduction means
without the DSP processing means at the time of setting or switching the reproduction sound
field mode. . Therefore, there is no interruption of sound associated with the muting process, and
the sense of incongruity in hearing is reduced. In this case, if the level attenuation means is
provided, the level of the reproduced sound is attenuated so as to be appropriate. Furthermore,
when the activation detection control means is provided, the input reproduction sound signal can
be directly reproduced when the activation of the DSP processing means is detected.
[0009]
Embodiments of the present invention will be described below with reference to the drawings.
FIG. 1 shows an embodiment of a DSP regeneration controller according to the present invention.
6, the same reference numerals as in FIG. 6 denote the same or similar circuits, and in the
present embodiment, the analog switch 11 is provided on the input side of the A / D converter 1,
and two switches 11a and 11b are provided. The microcomputer 3 is controlled to be interlocked
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and switched, and the output thereof is switched to the A / D converter 1 when switched to the a
side, and is switched to the electronic volume 9, 10 via the bypass circuit 12 when switched to
the b side. Configured to be connected to
[0010]
Now, as shown in FIG. 2, when the reproduction sound field mode of the DSP processing unit 2 is
switched when the input reproduction sound signal S3 is applied, for example, the room mode is
"hall" to "church". On the way, while the program and coefficient are being downloaded, the
electronic volumes 9, 10 are muted, and the DSP-processed audio output signal S4 is interrupted
as described above. Will occur.
[0011]
Therefore, at this time, the analog switch 11 is switched from the a side to the b side by the
switching signal S5 from the microcomputer 3, and the input reproduction sound signal S3
passes through the bypass circuit 12 without passing through the DSP processing unit 2. Direct
sound S4b is output in addition to the electronic volume 9, 10, and when the program,
coefficients, etc. are downloaded to the DSP processing unit 2 (during mute processing), it is
output as voice to reduce the sense of discomfort in hearing
[0012]
Furthermore, in order to reduce the sense of incongruity in the sense of hearing, at the time of
the playback sound field mode switching of the DSP processor 2, as shown in FIG. 3, the
electronic volume 9, 10 is controlled by the level control signal S6 from the microcomputer 3. To
reduce the volume of the direct sound S 4 b output without passing through the DSP processing
unit 2,
[0013]
FIG. 4 shows signal waveforms S3 and S4 at the time of setting the reproduction sound field
mode of the DSP processing unit 2, that is, when the power is turned on. Initial data and data
backed up in the section d are shown. Since (program and coefficients) are transferred, mute
processing is performed in this section d, and a break in sound S4a occurs, so that the direct
sound S4b which does not pass through the DSP processing unit 2 is output as described above,
and downloaded. After the processing is completed, the analog switch 11 is switched to the DSP
processing unit side.
[0014]
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FIG. 5 is a flow chart showing the control operation of the microcomputer 3 in the above
embodiment.
In FIG. 5, first, the power of the apparatus is turned on, and the analog switch 11 is switched to
the side b not passing the DSP processing unit 2 in step ST1. In steps ST2 and ST3, the
microcomputer 3 programs the DSP processing unit 2 respectively. Transfer coefficients, set
playback sound field mode.
[0015]
Next, at step ST4, the analog switch 11 is switched to the DSP processing unit a side.
In step ST5, it is checked from the keyboard unit 4 whether there is an input, for example,
switching of the reproduction sound field mode. If YES, the microcomputer attenuates the signal
not passing through the DSP processing unit 2 in step ST6. The level control signal is sent to the
electronic volume 9, 10 from 3 to increase the attenuation amount.
[0016]
Next, at step ST7, the analog switch 11 is switched to the side b where the DSP processing unit 2
is not passed.
In steps ST8 and ST9, after transferring the program and the coefficients from the
microcomputer 3 to the DSP processing unit 2, the analog switch 11 is switched to the DSP
processing unit side a in step ST10.
[0017]
As described above, according to the DSP reproduction control apparatus of the present
invention, it is possible to hear on the audibility resulting from the interruption of the output
sound due to the mute processing at the time of the reproduction sound field mode switching or
setting of the DSP processing unit. The effect of reducing discomfort can be obtained.
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