JPS5417001

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DESCRIPTION JPS5417001
Specification 10 Title of Invention
Sound image position control device
3. Detailed Description of the Invention The present invention relates to a sound image position
control apparatus, wherein signals without localization information are output from two two-ride
n [variable resistors whose resistance value is simultaneously changed by one stick. The distance
between the position of the stick and the sound image instructed and controlled by a human ear
stick to hear the noealal signal from the position of the stick by converting EndPage: 1 into a
signal as control No. 48 to EndPage: 1. An object of the present invention is to provide a sound
image position control apparatus for detecting a time difference. A signal (for example, a
monaural signal, each channel signal of multiple channels, etc.) which does not have localization
information recorded by microphones (so-called on microphones) arranged at a position close to
each sound source A signal conversion device is known in the prior art that converts into a
pinaural signal similar to the pinaural signal obtained when a pseudo head is present at a
position to be localized. In this type of device, localization information is intended when the
sound image is intended to be localized at an angle θ (usually, the front direction of the listener
is 0 °) and a distance r from the center point between the listeners' ears. To the signal that does
not have an attenuation amount according to the distance r, a frequency characteristic, and a
delay time according to the angle θ, a frequency characteristic, etc. By outputting a pinaural
signal to be listened to by the listener, the listener is made to hear as if the sound image is
localized at the angle 彦, the distance r by making the listener listen. Thus, the sound image to be
localized by the signal conversion device is instructed by the output of the sound image position
control device to a specific position in space or a trajectory to be moved. Tenth is a schematic
side view of an example of a conventional sound image position control device, and FIG. 2 is a
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circuit of an example to be applied to the first illustrated device proposed by Japanese Patent
Application No. 52-47585 by the present 811 IwA. Figure shows. In FIG. 1, reference numeral 1
denotes a stick, one end 1a of which is rotatably supported, and the free rotation of the stick 1
with the one end 1a as a fulcrum, the a end 1b has a hemispherical locus Draw. The resistance
values of the rotation variable resistors VR and VR2 are changed according to the amount of
change of the movement of the stick 1. In order to change the amount of resistance of the
variable resistor corresponding to the movement of the stick 1 so as to represent the mapping of
the entire stick or one point of that to the horizontal plane of the stick 1 as a position in
coordinates where the horizontal plane is a two-dimensional orthogonal coordinate. The rotation
variable resistor VR1VR2 is configured as shown in FIG.
In the figure, VR is a rotary variable resistor indicating the position of the stick 1 in the X
coordinate of the horizontal plane, and VR2 is a rotary variable resistor indicating the position of
the stick 1 in the X coordinate of the horizontal plane. One end of each of the rotation variable
resistors VR4 and VR2 is connected in common and connected to the positive DC power supply
voltage input terminal B, while the other end is connected to the negative DC power supply
voltage -B input terminal. , The above-mentioned origin (0, 0) of the two-dimensional rectangular
coordinates of X, Y is defined as the imaging position of the stick 1 when the stick 1 is in the
vertical state with respect to the horizontal plane, and at this time, the rotation variable resistor
'VR ,. The sliders of VR2 are set to come to their respective midpoint positions. Therefore, when
the stick 1 is in a vertical state with respect to the horizontal plane, the rotation variable resistor
VR ,. The DC voltages led to the output terminals 2 and 5 from the respective sliders of VR2 both
become Ov. Other than the vertical movement of the stick 1, the above X. The resistance values
of the rotation variable resistors VR1 and VR2 are changed so as to be represented as a change
in mapping position in the two-dimensional rectangular coordinate system of Y, and signals of
corresponding levels and polarities are taken out. Therefore, in order to detect the position
information of the sound image in the space intended to be localized, the sound image position
control device detects the <x, y> point shown in the X-Y rectangular coordinates and detects the
x, y points. The y signal must be converted by electrical circuitry into a distance and an angle
from the origin. For example, FIG. 5 shows a schematic WI schematic diagram of an example of a
circuit for converting the distance and angle as proposed by the present applicant in Japanese
Patent Application No. 52-47585. In the figure, the direct current from the output terminals 2
and 5 [IE indicates that the sliding variable is changed according to the movement of the stick 1;
The level and polarity correspond to the movement of the mapping of Stick 1 in the X coordinate,
and represent points of (s, y) in X, X coordinates. These DC voltages are supplied to the voltagedistance signal conversion circuit 4 where, After being converted to a signal representing / l, it is
converted to a signal representing x4-y and output as an analog signal (r,) representing a square
r2 of a distance rEndPage: 2 from the output terminal 6 . On the other hand, the DC voltage of
the upper ge output terminals 2 and 3 is also supplied to a voltage-angle signal conversion
circuit 5 which converts it into a signal representing x / y by a divider and further converts it into
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a signal representing tan-. And is introduced to the output terminal 7 as an analog signal (θ,)
representing an angle θ based on one direction. As described above, the sound image position
control device shown in FIG. 1 moves the sound image to an arbitrary place, and in order to
localize the sound image, the circuit as shown in FIG. 6 uses (rj) and (θ2) The phase difference
between the left and right ears must be obtained only after obtaining an analog signal: This
signal must be controlled according to the distance, and in particular, the voltage-distance signal
conversion circuit 4 and the Den-Ak-angle signal conversion circuit 5 have complicated
configurations. The circuit is large in size and expensive.
The present invention solves the above-mentioned problems, and the respective embodiments
will be described with reference to FIG. FIG. 4 ^, @ show a partial longitudinal sectional side view
and a plan view of the first embodiment of the device of the present invention, respectively. In
the same figure fA, '81 8 is a stick, one end of which is fixed to the sliding portion 8α. The
sliding portion 8α is configured to slide on the panel surface 10a on the base 10 provided in the
chassis 9. The sliding portion 8α is fixed by the shaft 12 (, via the U-shaped connecting portion
11). The shaft 12 is displaced integrally with the stick 8 by moving the stick 8 up the panel
surface. The shaft 12 or one end thereof is fixed to the slider of the slide variable resistor 15, and
the other end is fixed to the slider of the slide variable resistor 14. The slide variable resistor 16
is configured so as to be rotatable in the direction perpendicular to the paper surface of FIG. 4
around the fulcrum shaft 15 fixed to the base 10 inserted into the end thereof. Similarly, the slide
variable resistor 14iJ is configured so as to be rotatable in the direction perpendicular to the
sheet of the drawing in (2) around the fulcrum shaft 16 (fixed to the base 10) inserted at its end. .
The fulcrum shaft 15.16, as shown in the fifth Japanese, is cast so as to be spaced apart from the
panel surface 10α by a predetermined distance in parallel so as to correspond to the positions
of the human ears. In the drawing of stick 8 and stake 5 and FIG. FAJ, the slide variable resistor
15.14 is also moved in an arbitrary direction and the slide variable resistor is moved linearly
along with this, so that the fulcrum shaft 15.16 is moved. In the same figure (the part shown by a
dotted line is a place where the stick 8 can not physically move. When the stick 8 is in the
position as shown in FIG. 5, the distance r1 between the fulcrum shaft 15 and the stick 8, ie, the
shaft 12 (slider of the slide variable resistor 16) is a sound image from the listener's left ear The
distance τ2 between the fulcrum shaft 16 and the shaft 12 (slider of the slide variable resistor
14) represents the distance from the listener's right ear to the sound image. That is, a
predetermined voltage is applied to slide variable resistors 15 and 14 in advance, respectively,
and an electric current E of a value corresponding to the resistance value that changes according
to the position of the slider is slide variable resistor 15.14. Each output is output, this output is a
distance r1. It corresponds to r2 respectively. FIG. 6 is a circuit diagram of a first embodiment of
a circuit for obtaining a signal heart sound position detection signal detected by the device of the
present invention. In the figure, reference numerals 17 and 18 denote output voltage input
terminals of the slide variable resistors 13.14, respectively. The voltage of the level according to
the value of r2 is supplied to the IJ box circuit 19 where the operations of r and r2 are
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performed, while the voltage is applied to the movable contact of the switch SW1 ° SW2
constituting the switching circuit 21. .
The output difference signal of the matrix circuit 19 is supplied to the positive determination
circuit 20, where it is determined whether the polarity is positive or distorted. When the input
signal is positive or zero, the positive decision circuit 20 switches the switch sw1. The switch sw2
is switched to the contact afa, and when it is negative, a switch sw, and a switching signal for
switching the sw2 to the contact btl [l] is applied to the switching circuit 21. Thus, the distance
ymr1. A signal of a shorter distance of r2 is output from the output terminal 22 as a distance
signal r. Further, an output difference signal of the matrix circuit 19 is outputted from the output
terminal 23 EndPage: 3 as a signal Δφ representing a time difference of arrival from the sound
image to both ears. Now, assuming that the stick 8 is at the position indicated by P in FIG. 7, a
signal of a distance r2 ° corresponding to the distance from the listener's right ear to the sound
image is selected and output. . Also, assuming that the stick 8 is at the position indicated by Q in
the same figure, the signal of the difference between the fulcrum shaft 15 ° 16 and the distance
r1 / r21 from the point Q is negative, and at this time it is defined as the left half plane. The time
difference signal Δφ and the output signal of the slide variable resistor 15 representing r as the
distance signal r are respectively output. In this case, the right and left planes are determined on
the basis of the perpendicular bisector of the line connecting the fulcrum axes 15 ° 16 and the
distance and the time difference to both ears are determined so as to be symmetrical. There is no
problem. When stick 8 is positioned at point R in FIG. 7 which is extremely close to this
perpendicular bisector, the distance from fulcrum shaft 15 ° 16 to point R; r; is approximately
equal, and time difference Δφ is also approximately equal. It is zero. However, it is extremely
rare for the stick 8 to be located at the correct vertical bisector, which is usually the case where
Δφ is approximately zero and the two distances are approximately equal, so the distance r, ′ ′
or r2 is used as the distance. It will be selected either '. Therefore, the time difference and the
distance from the ear can be detected as well as the P and Q points. In this way, the localization
position of the sound image is clearly displayed by the stick 8, and the time difference from the
sound image to both ears, the distance, the plane of the stick 8, the resistance value along with
the movement of the brow without complicating the circuit configuration It can be detected
directly by the output of the variable slide variable resistor 15.14. FIG. 8 is a partially
longitudinal side view of a second embodiment of the device according to the present invention,
and FIG. 9 is a schematic view of one embodiment of the main part of FIG. The same reference
numerals as in FIG. 4 denote the same parts in FIG. 8 as in FIG. 4 (B), and a description thereof
will be omitted. In the first embodiment, it is not necessary to distinguish whether the sound
image is C ··, which is the left half plane or the right plane of the listener.
In this embodiment, two fulcrum axes, that is, the back and forth judgment can be performed on
the listener's both ears. That is, in FIG. 8, the fulcrum shaft 16 is fixed to the slider of the rotation
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variable resistor 24 and fixed to one end of the slide variable resistor 14. Thus, along with the
movement of the stick 8, the sliders of the slide variable resistors 15.14 move linearly, and the
sliders of the fulcrum shaft 16 and the rotation variable resistor 24 integrally rotate. . Therefore,
the resistance value of the rotation variable resistor 24 is varied according to the position of the
stick 8. Here, as shown in FIG. 9, the rotary variable resistor 24 has terminals 25 and 26.27
attached to the chassis 28, and power supply voltages of 10 B and -B are applied to the terminals
25 and 27, respectively. The slider 24α is connected to the terminal 26. When the slider 24α is
located at the point 29 of the resistor, the output voltage of the terminal 26 is 0 volts and none,
and when the slider in FIG. 9 is located above the point 29, it is positive. When the output voltage
is also on the lower arc, the negative output voltage lE is picked up at terminal 26 respectively.
Therefore, by assigning the side where the positive voltage is output as the front half and the side
where the negative voltage is output as the rear half, it is possible to determine the back and
forth according to the polarity of the output variable of the rotation variable resistor 24. . FIG. 10
is a block diagram of a second embodiment of a circuit for obtaining a sound image position
detection signal from a signal detected by the device of the present invention. The same
reference numerals as in FIG. I omit it. In FIG. 10, 26 is the output terminal of the rotary variable
resistor 24 shown in FIGS. 8 and 9, is the voltage received from this positioned in the front or in
the rear of the listener whether the sound image is located? The output terminal 30 is led to the
subsequent stage circuit as the front / rear judgment signal S for judging the The time difference
detection signal Δφ output from the distance signal r1 output terminal 26 output from the
output terminal 22 of FIG. 6 or 10 da and the front / rear determination signal output from the
output terminal 50 in FIG. For example, the natural sound image localization device considering
the correlation between the level difference (.DELTA.P) and the phase difference (.DELTA..phi.) Of
the signals at the positions of both ears of the listener as described in the NHK Giken Gazette
Dec. 50 issue. Are used to control ΔP and Δφ of By this, according to the movement of the stick
8, the sound image in the sound field of EndPage: 4 is moved to an arbitrary position by an
especially 4 channel's pinaural signal, and the natural sound image is moved to an arbitrary
position determined by the stick 8. Can be localized.
As described above, in the sound image position control device according to the present
invention, the first and second variable resistors are supported on one end of each of the first
and second variable resistors to which the slider is moved linearly. The whole is configured to be
rotatable, and the fulcrum is spaced apart so as to correspond to the positions of the listener's
ears, and the sliders of the first and second variable resistors are arranged in a plane. Because it
is configured to move together with the stick that can be freely moved at the same time, the time
difference between the two ears until the signal reaches the listener's ears from the sound image
necessary to obtain a pinaural signal is a complicated configuration It is possible to detect
directly from the outputs of the first and second variable resistors without using the above
circuit, and the distance from the sound image to the listener can be detected by the first or
second circuit without the need for a circuit with a complicated configuration. Directly from the
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output of the variable resistor Therefore, the circuit configuration is simple and inexpensive, and
the display device for displaying the conventional sound image position and the circuit necessary
for the display are located on the front, rear, left and right on the plane by the above-mentioned
stick position. Can be omitted because it can be clearly displayed, and a rotation variable resistor
is provided to allow the slider to be rotated integrally with rotation of at least one of the first and
second variable resistors. It has many features, such as being able to clearly determine whether
the position of the rotary variable resistor must be before or after the listener, especially when
obtaining multi-channel pinaural signals. It is a thing.
4. Brief Description of the Drawings FIG. 1 is a schematic side view of an example of a
conventional sound image position control device, and FIGS. 2 and 3 are respectively applied to
the device shown in FIG. 1 previously proposed by the present applicant. Fig. 4 (2), fBl is a partial
longitudinal sectional view of the first embodiment of the device according to the present
invention, and a circuit diagram of a circuit for converting the output of the first illustrated
device into a distance and an angle. Side view, plan view, FIG. 5 and ta + are plan views of the
main parts of the first embodiment of the device of the present invention, and a view
schematically showing the movable range, and FIG. 6 is FIG. 4 (4) (The circuit according to the
first embodiment of the circuit for obtaining the sound image position detection signal from the
signal detected by the device of the present invention shown in FIG. FIG. 7 is a diagram showing
the positional relationship between the stick and the fulcrum of the variable resistor, FIG. 8 is a
partial longitudinal sectional view of the second embodiment of the device of the present
invention, and FIG. FIG. 10 is a block diagram of a second embodiment of a circuit for obtaining a
sound image position detection signal from the signal detected by the device of the present
invention shown in FIG. 1.8 ··· Stick, 12 ··· 1L 15.14 · · · Slide variable resistor, 15.16 · fulcrum
shaft, 17 ° 18 · · · Slide variable resistor output signal Sword terminal 22 · · · Distance signal
output terminal 23 Time difference signal output terminal 24 Rotation variable resistor. Patent
Applicant Nippon Victor Co., Ltd. Attorney Attorney Tadahiko Ito 'EndPage: 5
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