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JPH0295100

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DESCRIPTION JPH0295100
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a
sound field variable device capable of freely changing a reproduced sound field according to a
scene (frame) of an image. 2. Related Art In recent years, development of a sound field
reproducing apparatus has been regarded as important, and a sound field variable device capable
of simulating a sound field such as a ball has been developed. FIG. 4 is a hardware block diagram
showing the configuration of a conventional sound field reproduction apparatus. In FIG. 4, 1 is a
signal input means for inputting a digital signal, 9 is a signal processing means for performing
signal processing to achieve the target sound field characteristics for the input signal, and 10 is a
signal processing means for performing signal processing in the signal processing means.
Processing instruction means for instructing the processing procedure of the system, system
control means 7 for changing the instruction content of the processing instruction means and
controlling the signal switching means, and signal output means 8 for outputting a digital signal.
The operation of the conventional sound field variable device configured as described above will
be described. In FIG. 4, the digital signal manually input from the signal output means is
subjected to signal processing in the signal processing means 9 in accordance with the
processing procedure of the processing instruction means. Next, the output from the signal
processing means 2 is outputted from the signal output means 8, converted into an analog signal
by an external digital-analog converter, and connected to an amplifier and a speaker to
reproduce the sound field characteristics to be reproduced. You can do it. When it is desired to
change the sound field to be reproduced, after the processing procedure is transferred from the
system control means 7 to the processing instruction means, the reproduction sound field can be
changed by performing the same process as described above. SUMMARY OF THE INVENTION
However, in the configuration as described above, when it is intended to change the sound field
data continuously in the scene (frame) of the image, the system control means makes all the
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processing procedures from the processing instruction means. It had to be transferred, and it
took time to transfer, and it had the problem that sound field switching at an early interval was
not possible. The present invention has been made in view of the above problems, and smoothly
changes the sound field quickly, and continuously synchronizes movement of the sound field,
sense of distance, spread confusion, movement of sound image, etc. It is an object of the present
invention to provide a sound field variable device realized in real time. Means for Solving the
Problem In order to achieve this object, the sound field variable device according to the present
invention stores first and second processing instruction means for storing processing procedures
necessary for realizing continuous sound field change. And the sound written on another medium
synchronized with the frame so as to correspond to each video scene (frame) on the same
medium on which the video signal is recorded and the selection code of the processing procedure
at the time of sound field switching Field control code C or less: System control means for
transferring this from "the code J on the medium", first and second signal processing means for
performing signal processing according to processing procedures, and outputs from the plurality
of signal processing means And signal switching means for switching smoothly.
Operation With this configuration, continuous or many processing procedures are stored in
advance in the first and second processing instruction means, and the medium is controlled by
the system control means when switching the playback sound field according to the scene
(frame) of the video. Send the code for selecting the processing procedure to realize the playback
sound field from the above code to one of the processing instruction means, and after the signal
processing has been stabilized according to the processing procedure selected by the signal
processing means, switch the signal. By switching the output while adding together the gradually
reduced amplitudes of the first and second signal processing means by means, the reproduced
sound field is continuously reproduced without switching noise in real time. Can change.
Embodiments Hereinafter, one embodiment of the present invention will be described with
reference to the drawings. FIG. 1 is a hardware block diagram of a sound field variable device
according to an embodiment of the present invention. In FIG. 1, 1 is a signal input means for
inputting a digital signal, 2 is a first signal processing means for processing a signal by
performing delay and feedback of the input digital signal according to a determined procedure, 4
is a first signal processing The second signal processing means having the same function as the
means, 3 is the first processing instruction means for instructing the signal processing means to
process the signal processing procedure, 5 is the second processing instruction means, 6 is the
first signal Signal switching means for switching the output signals of the processing means 2
and the second signal processing means 4; 7 is a code for processing procedure selection read to
the first and second processing instruction means 3.5 from the code on the medium and
transferred At the same time, system control means for controlling the signal switching means 6
and signal output means 8 for outputting a digital signal. 9 is a means for reading control code
from code on the medium. The operation of the sound field variable device configured as
described above will be described below. In FIG. 1, in the case of the normal operation, the signal
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from the signal input means 1 is processed in accordance with the processing procedure selected
by the first processing instruction means 3 in the signal processing means 2, and the signal
switch 7 The signal of the signal processing means 2 is selected and output from the signal
output means 8. At this time, the same processing procedure as that of the processing instruction
means 3 of the signal processing means 2 is selected as the processing instruction means 5 of
the second signal processing means 4. The signals from the first signal processing means 2 are
selected by the signal switching means 7 from the signals outputted from the first signal
processing means 2 and the second signal processing means 4 and are outputted from the signal
output means 8. Next, the time of sound field data switching will be described. If the hall is
projected on the screen and the position of the listening point changes continuously as if the
main character is listening to music while changing seats in the hall, then only the size of the
sound should be changed. (A continuous processing procedure with delay time and feedback
information is required.
FIG. 2 shows a memory map of the processing instruction means. Also, FIG. 3 shows a diagram
representing the listening position of a certain hole. As shown in FIG. 2, processing procedures
for realizing listening characteristics corresponding to the respective listening positions 1 to 56
in FIG. 3 are stored for each area on the memory. When the sound field data is switched, a code
for selecting an address at which a processing procedure for realizing the sound field of the
listening position moved from the system control means 7 to the second processing instruction
means 5 is transferred. For example, when moving from A to B in FIG. 3, the processing
procedure is selected in order from No. 4 to No. 11 to No. 18 and No. 25 in the memory map of
FIG. First, when the 11th processing procedure is selected and the output from the second signal
processing means 4 is stabilized, the control signal read from the code on the medium is
outputted from the system control means 7 to the signal switching means 6 as a switching signal.
Do. The signal switching means 6 gradually reduces the signal from the first signal processing
means 2 and outputs the sum of both signals while gradually increasing the signal from the
second signal processing means 4. After that, the output from the signal switching means 6
switches to the signal from the second signal processing means 4. Next, the 18th process
procedure of the first process instructing means 3 is selected again from the system control
means 8, the above operation is repeated alternately, and finally the 25th process procedure is
processed as the second process instruction The means 5 may be set. In the present embodiment,
the speed at which the processing procedure of the first processing instruction means and the
processing procedure of the second processing instruction means 5 are switched can be
arbitrarily changed. As described above, according to the present embodiment, using a plurality
of signal processing means and a plurality of processing instruction means, processing
instructions necessary for performing continuous sound field control are stored beforehand in
the processing instruction means, and system control is performed. By only sending the code for
processing procedure selection from means 7, the sound field can be changed in real time and
continuously without generating noise at the time of data switching. Further, although the
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continuous change of the listening position has been described in the present embodiment, if the
processing procedure for changing the movement of the sound image, the change of the sense of
distance, etc. is also stored in the processing instruction means It is possible to perform variable.
Effects of the Invention As described above, according to the present invention, using two signal
processing means and two processing instruction means, processing procedures for performing
continuous sound field control are stored in advance in the processing instruction means, the
sound field At the time of data switching, the system control means 7 only reads the control
signal from the code on the medium and sends the code for processing procedure selection to
reproduce the continuously changing sound field or for the rapidly changing sound field.
Reproduction can be performed in real time and without generating noise.
[0002]
Brief description of the drawings
[0003]
1 is a block diagram of hardware according to an embodiment of the present invention, FIG. 2 is
an explanatory view showing a memory map of the processing instruction means of the present
invention, FIG. 3 is an explanatory view showing a listening position of a hole, FIG. Is a block
diagram of hardware of a conventional sound field variable device.
1ииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииии
и и и и и и и и и и и и и и и и и и и и и и и и Means, 5 ииииииии Second processing instruction means, 6 иииииии Signal
switching means, иииииии System control means, 8 иииииии Signal output means, 9 ... Control signal
reading means. Name of Agent Attorney Attorney Shigetaka Hagino 1 person figure Fig. Nusesoe
area Fig.
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