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JPH03157099

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DESCRIPTION JPH03157099
[0001]
FIELD OF THE INVENTION The present invention relates to an audio reproduction device of an
audio O visual software reproduction device. 2. Related Art Recent developments in audio and
visual equipment in recent years are remarkable, and along with the increase in size of monitor
screens by projection TVs, the spread of laser disks, and the enhancement of VTR performance,
audio signal reproduction is also Dolby Pro Logic decoder (The decoder system described in JPA-61-251400) is combined with a high-performance, high-output audio component to achieve
movie theater-like sound quality, audio visual software such as movies as a sound field at home
The need for enjoying home theater is increasing. In addition, audio and visual software can be
upgraded from conventional monaural recording to stereo second channel recording and further
to Dolby surround recording mixed with surround components, and development can be
expected from both sides of software hardware . When audio / visual software is to be
reproduced on a home theater, as shown in FIG. 4, a screen 11 for image reproduction at the
center, 7L for Lch, 7R for Rch and a center ah (hereinafter referred to as Cch) 7C are disposed,
and the surround speakers 10L and 10R are disposed at the left and right of the operator. FIG. 3
is a block diagram for reproducing the audio signal of FIG. In FIG. 3, 1 indicates an audio second
channel signal. Dolby Pro Logic decoder for separating into C and R signals and surround S
signals, 4 is a front Lah playback power amplifier, 5 is a front Cch playback power amplifier, 6 is
a front Rch playback power amplifier, 7L, 7G, 7R Front LCR playback speakers, 8 is a surround
signal processing block, 9 is a surround playback power amplifier, 10L. ???????????
??????? The operation of the audio signal reproduction apparatus configured as
described above will be described. A video signal reproduced by an audio / visual reproduction
device such as a laser disk or a VTR is visualized by the image reproduction screen 11 shown in
FIG. 4 so that a large screen can be enjoyed. On the other hand, the audio signal is shown in FIG.
3 (Lt times signal Rt times signal Dolby Pro Logic Decoder 1 is divided into four signals of front
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signal, C, R and surround signal S, and for front LCR reproduction At the same time as the front
side is reproduced by the front LCR reproduction nuplicators 7L, 7C and 7R via the power
amplifier 4 and 5.6, the surround signal is subjected to a predetermined delay and noise by the
surround signal processing block 8. After the reduction processing, the surround speakers 1oL
and 10R are reproduced via the surround reproduction power amplifier 9.
However, in the configuration and installation described above, the sound on the front side is
reproduced in a planar manner. For example, when the image serving as the sound source is at
the center of the video reproduction screen 11, the reproduced sound is reproduced by the front
Cch reproduction speaker, but generally the front Cch reproduction speaker 7C reproduces the
line, The front LR reproduction speakers 7L and R reproduce the sound effects. In this case, as
shown in FIG. 4, the sound to be reproduced can be heard from the front LCR reproduction
speakers 7L, 7C and 7R placed parallel to the image reproduction screen 11, without any sense
of front and back of the sound and flat It becomes a sound. As means for solving the problem, the
front LR reproduction speakers 7L and 7R may be installed behind the image reproduction
screen 11, but the degradation 9 of the sound image localization due to the influence of the
image reproduction screen 11 occurs. It is not common. As described above, at the time of audiovisual software reproduction, there is a problem that the unnaturalness and lack of effect due to
the planar reproduction of the sound image determined by the installation of the front speakers
remain. SUMMARY OF THE INVENTION In view of the above problems, the present invention
provides an audio signal reproduction apparatus that controls sound image localization by time
delay processing of front L and R signals and reproduces them using a speaker to improve the
feeling of the front sound image It is. Means for Solving the Problem In order to achieve this
object, the audio signal reproduction device of the present invention has separated fronts L, C.
Among the R signals, a delay unit for delaying the L and R signals in time is provided in series
after the Dolby Pro Logic decoder, and the center signal of the Dolby Pro logic output and the
delayed L and R signals are placed in front of the screen. It is configured to be reproduced from
the front reproduction speaker. In the present invention, the sound image localized in the front
horizontal row by the above-described configuration and installation can be localized behind the
video reproduction screen by reproducing the delayed L and R signals using the front LR
reproduction speaker. It becomes possible. That is, it is possible to localize the sound image on
the front and back of the screen only by adding a simple circuit for audio reproduction on the
front side where sound image localization was performed parallel to the screen, and audio /
visual software reproduction with front and back feeling in front sound image is possible. It
becomes. Embodiments Hereinafter, one embodiment of the present invention will be described
with reference to the drawings. In FIG. 1, audio signals Lt and Rt of left and right channels
reproduced by an audio visual apparatus such as a laser disk or VTR are applied to a Dolby Pro
Logic decoder 1.
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Dolby Pro Logic Decoder 1 separates audio signal Lt, Rt times signal, C, R signal and surround S
signal recorded by Dolby encoder, and the output C signal is the power for front Cch
reproduction. It is given to the amplifier 5. The front Cch reproduction power amplifier 5
performs power amplification, and the output thereof is given to the front Cch reproduction
nuhica 5C. Of the outputs of the Dolby Zolo logic decoder 1, L and R signals are applied to the
delay unit 2.3. The delay unit 2.3 is for independently performing time delay on the R signal, and
its output is given to the front LR reproduction power amplifiers 4 and 6. The front LR
reproduction power amplifier 4.6 delays or amplifies the power of the R signal, and its output is
given to the front speakers 7L and 7R. The surround S signal separated by the Dolby Pro Logic
decoder 1 is supplied to a surround signal processing block 8. The surround signal processing
block 8 performs predetermined delay and noise reduction processing, and its output is given to
the surround reproduction power amplifier 9. The surround reproduction power amplifier 9
amplifies the power of the surround signal, and its output is the surround speaker 10L. It is given
to 10R. FIG. 2 is a plan view of a trial listening room in the home for explaining the installation
method of the front LCR reproduction nuvy forces esL, 5C, SR of FIG. 1 and the sound image
localization position. In FIG. 2, 11 is a screen for image reproduction, 1 or, and 10R are surround
speakers. The operation of the audio signal reproduction device of this embodiment will be
described below. In FIG. 1, the input audio signal Lt, Rt signal is separated into front L, C, R
signals and surround S signals by the Dolby Pro Logic decoder 1, and C of the front L, C, R
signals, C The signal is power-amplified through the front Cch reproduction power amplifier 5,
and the noise is reproduced from the front Cch reproduction speaker 7C. Further, the surround S
signal separated by the Dolby Pro Logic decoder 1 is subjected to predetermined delay and noise
reduction processing by the surround signal processing block 8, and power amplified by the
surround reproduction power amplifier 9, and the surround speaker 10L. The sound is
reproduced from each of 10R. The above is the same as the configuration and operation of the
conventional example, but after the front L and R signals separated by the Dolby Pro Logic
decoder 1 are all delayed independently through time delays of 2.degree. The power is amplified
through the front LR reproduction power amplifiers 4 and 6, and the sound is reproduced from
the front LR reproduction speakers 7L and 7R.
Here, the front L, C, and R signals are each Lo (t). Let Co (t) and Ro (t), let the time delay of the
delay unit 3 be ?, and let Lout, Cout and Rout be the signals reproduced from the front LCR
reproduction speakers 5L, 5C and 5R, respectively. Lout = Lo (t + r)--------(1) Cout = Co (t)-------------- (T + r)-----------------------(3) The front Lout and Rout signals are regenerated behind the front
Cout signal by the time delay ?. In the arrangement of the front LCR reproduction speakers 6L,
5C, and SR installed as shown in FIG. 2, the sound image of Lout and Rout reproduced from the
front is 7L 'indicated by a broken line due to the delay ?. The sound image is localized as a
virtual sound source at the position of 7R. Front LCR playback speakers 7L and 7C. The
conventional planar sound image localization reproduced from 7R delays the L and R signals by
time delay, the LR signal is easily localized backward, and the C signal emits sound from the front
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of the image reproduction screen 11 As a result, it is possible to improve the planarity of the
front sound image. As described above, according to the present embodiment, it is possible to
freely control the sound image localization simply by adding a circuit for delaying the front LR
times signal time and performing LCR signal signal front reproduction by the power amplifier
and the front speaker.? Improvement of front and rear sense of the front sound image can be
realized for visual software reproduction. Effect of the Invention The present invention focuses
on the installation state of speakers in audio / visual software reproduction and the naturalness
of images and sound images, and reproduces from the front speakers a signal that is subjected to
LR time delay processing among the front audio signals. Thus, the present invention is an audio
signal reproduction device capable of arbitrarily controlling sound image localization and capable
of easily improving the sense of flatness of a front side sound image.
[0002]
Brief description of the drawings
[0003]
FIG. 1 is a block diagram showing the configuration of an audio signal reproducing apparatus
according to an embodiment of the present invention, FIG. 2 is a plan view of a listening room in
a home for explaining the speaker installation method and sound image localization position of
FIG. 3 is a block diagram showing the configuration of a conventional audio signal reproduction
apparatus, and FIG. 4 is a plan view for explaining the speaker installation and sound image
localization position of FIG.
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и и и и и и и и и и и и и и и. ... Front Cch playback power amplifier 6, ..... Front Rch playback power
amplifier, 7L ..... Front Lch playback speaker, 7C ..... Front Cch playback speaker, 7R и и и и и и и и и и и и
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Surround speaker (5), 11 ... old ... Screen for image reproduction.
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