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JPH0884400

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DESCRIPTION JPH0884400
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a
sound image control apparatus for controlling sound emitted from a two-channel speaker based
on the position of a sound source with respect to a virtually formed listener.
[0002]
BACKGROUND OF THE INVENTION Prior to the present invention, in the specification and
drawings of Japanese Patent Application No. 6-80052, distance information for supplying
distance information indicating a virtual distance between a listener and a sound source is
provided. Distance control of sound image based on the above distance information and supply
means, direction information supply means for supplying a virtual positional relationship
between a listener and a sound source as direction information on a circumference in a
horizontal plane centering on the listener, and We propose a sound image control device that
includes a perspective control unit that performs a two-channel stereo sound signal output from
the perspective control unit and a horizontal sound image control unit that controls the direction
of the sound image based on the direction information. did.
[0003]
However, in the above-mentioned conventional apparatus, the distance and direction information
with respect to the sound source are directly sent as they are to the perspective control unit and
the in-horizontal-plane sound image control unit as they are. Many were complex and time
consuming.
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[0004]
Furthermore, in the perspective control unit and the in-horizontal-plane sound image control
unit, there is a problem that the processing becomes very complicated in order to select the
control parameter and control the sound image.
The present invention has been made in view of the problems of the prior art, and it is an object
of the present invention to reduce the amount of control information transmitted to the control
unit to speed up processing.
[0005]
SUMMARY OF THE INVENTION According to the present invention, there is provided a sound
source coordinate output means for outputting position coordinates of a sound source, and code
information for controlling a sound source position based on the position coordinates of the
sound source outputted from the output means. And a transfer characteristic processing circuit
for generating an acoustic signal for controlling the sound image position of the sound source
signal based on the code information output from the generator.
[0006]
The code information generator divides the sound space into a plurality of small areas, assigns a
code corresponding to each of the divided small areas, and outputs the code, and the transfer
characteristic processing circuit generates a sound source signal. It comprises: a variable
coefficient filter to be converted; and a coefficient memory setter for setting the coefficient of the
filter according to the code information output from the code information generator.
[0007]
Since the position coordinates of the sound source are coded in a small area into which the space
having the sound source is divided and transmitted to the transfer characteristic processing
circuit, the amount of transmission can be reduced.
[0008]
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT A sound image control apparatus
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2
according to an embodiment of the present invention will be described in detail with reference to
the drawings.
Although the case of controlling a sound image on a two-dimensional plane is considered here,
the control of a sound image in a three-dimensional space can be considered similarly.
[0009]
FIG. 1 is a block diagram of a basic circuit of the sound image control apparatus.
In the figure, reference numeral 1 denotes sound source signals of the original left and right two
channels to be reproduced, and 2 denotes sound source coordinate output means for inputting
the position of the sound source signal in the sound reproduction space and outputting its
coordinate value.
[0010]
The sound source coordinate output means 2 uses, for example, a personal computer equipped
with a keyboard, a mouse and a monitor to display an audio reproduction space on the monitor,
and to an appropriate position by key input or mouse input to this monitor. By setting the sound
source signal, the coordinate value of the position of the sound source signal input automatically
can be output.
[0011]
A code information generator 3 converts output coordinate values of the sound source
coordinate output means 2 into code information and outputs the code information.
Reference numeral 4 denotes a transfer characteristic processing circuit, which receives the
sound source signal 1 and code information, adjusts the amplitude of the sound source signal of
2 channels and the balance of the left and right according to the position of the sound source
signal 1 to be reproduced. It is an output.
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[0012]
Reference numerals 51 and 52 denote amplifiers for appropriately amplifying the control signal
outputs 1 and 2 of the two channels of the main transfer characteristic processing circuit 4, and
reference numerals 61 and 62 denote speakers driven by the outputs of the respective amplifiers
51 and 52.
[0013]
In the sound image control apparatus having the above configuration, two-dimensional
coordinate data (X1, Y1) of the sound source signal output from the sound source coordinate
output means 2 is transmitted to the code information generator 3.
[0014]
The code information generator 3 converts the coordinate data into code information as follows.
That is, as shown in FIG. 2, the screen of the monitor is divided into horizontal (X) direction and
vertical (Y) direction to create n × m matrices, and 11-nm codes are made to correspond to the
blocks on each matrix. .
Then, the code number of the corresponding block is selected from the two-dimensional
coordinate data, and the code number is transmitted to the transfer characteristic processing
circuit 4.
[0015]
The transfer characteristic processing circuit 4 corresponds to the first and second variable
coefficient filters 41 and 42 for filtering the source signal of two channels as shown in FIG. The
coefficient memory setting unit 43 extracts the corresponding coefficient from among the stored
coefficients based on the code information stored together with the plurality of filter coefficients
and sets the coefficients in the filters 41 and 42. It is configured.
[0016]
The filters 41 and 42 convolute the set filter coefficients with the sound source signal 1 to create
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an acoustic reproduction control signal, which is output to the amplifiers 51 and 52.
The amplifiers 51 and 52 drive the speakers based on the sound reproduction control signal to
realize a sound image as if sound is being reproduced from the position of the sound source
signal set first.
[0017]
Within the block of the matrix generated by the transfer characteristic processing circuit, the
control of the position of the sound source signal does not change even if there is some
positional fluctuation, and only the same sound image is obtained.
[0018]
Therefore, in order to correspond to a slight positional change of the sound source signal, a
method of designating a block of the sound source signal and a block next to it and interpolating
between them is shown in FIG.
In this case, assuming that the designated area by the coordinate value of the sound source
signal is, for example, the areas 22 and 23 in FIG. It will be added through.
[0019]
The transfer characteristic processing circuit 4 comprises two variable coefficient filters 411 and
412 for the first region, two variable coefficient filters 421 and 422 for the second region, a
coefficient memory setting unit 43, and the filters 411 and 421, respectively. Four multipliers 71
to 74 corresponding to 412 and 422, a multiplication coefficient setting unit 75 for storing
multiplication coefficients and extracting and setting appropriate coefficients for the respective
multipliers 71 to 74, and these multipliers The adders 81 and 82 add the outputs 71, 72 and 73
and 74, respectively, to generate an audio reproduction control signal of each channel.
[0020]
Then, filter coefficients corresponding to the two regions are selected by the coefficient memory
setting unit 43 and sent to the filters 411, 421, 412 and 422 according to the above code
information, and the acoustic signal is divided into the regions 22 and 23 by the coefficients.
Process separately.
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[0021]
Next, coefficients are selected by the multiplication coefficient setting unit 75 based on the
interpolation code information and sent to the multipliers 71-74.
The multipliers 71 to 74 multiply the outputs of the filters 411, 421, 412, and 422 based on
these coefficients, respectively, and the results are added to create a reproduction control signal
of two channels.
[0022]
With this configuration, it is possible to produce subtle changes in the sound source position in
the block by means of the reproduced acoustic signal.
[0023]
According to the present invention, since the coordinate position of the sound source signal is
converted into a code and transmitted to the transfer characteristic processing circuit as
described above, it is possible to transmit rather than transmit the information of the coordinate
position as it is. Since the amount of data can be small, the processing becomes faster and the
responsiveness of the reproduced signal to the sound source signal becomes better.
[0024]
In addition, correction processing of the sound source signal corresponding to the transmitted
code may be performed in the transfer characteristic processing circuit, and the effect of
simplifying the processing can be expected.
[0025]
Brief description of the drawings
[0026]
1 is a circuit block diagram of an embodiment of the sound image control apparatus of the
present invention.
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[0027]
2 is a diagram for explaining the method of region segmentation and coding of the acoustic
space.
[0028]
3 is a circuit block diagram for explaining an embodiment of the transfer characteristic
processing circuit.
[0029]
4 is a circuit block diagram for explaining another embodiment of the transfer characteristic
processing circuit.
[0030]
Explanation of sign
[0031]
1 sound source signal 2 sound source coordinate output means 3 code information generator 4
transfer characteristic processing circuit 41, 42 filter 43 coefficient memory setter
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