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JPS5483801

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DESCRIPTION JPS5483801
Description 1, title of the invention
Automatic sound image position control device
3. Detailed Description of the Invention The present invention relates to an automatic sound
image position control apparatus by using a variable frequency oscillator and a counter. When
converting a signal having no localization information into a signal having localization
information, the output automatically localizes a sound image at a desired position in space, or
automatically moves the sound image to an arbitrary position at a recumbent position, It is an
object of the present invention to provide an automatic sound image position control device
capable of accurately controlling the movement direction of the sound image and instructing the
movement direction, speed, maximum movement position and the like of the sound image. A
pinaural signal similar to a pinaural signal obtained by a pseudo head when a signal having no
localization information (for example, a monaural signal, a signal for each multichannel channel,
etc.) is present at a position where the sound source is to be localized A signal conversion device
for converting into. Intended to localize the sound image at a distance r from this kind of 両 t (/ i,
an angle θ from the center point between both ears of H loser (normally, the front direction of
@follower is 00) In this case, the signal not providing localization information is given a damping
characteristic according to the above nr, a frequency characteristic, and a delay time according to
the above angle θ, and a frequency 'Pi characteristic so as to be listened to by the left ear By
outputting a signal and a binaural signal to be listened to by the right ear, and having the listener
listen, it is perceived that the sound image is localized at a distance r and a distance r. However, a
sound image to be localized by the above signal conversion device, or a sound image to be moved
by the localization position (a desired position in space by the output control signal of the sound
image position control device, or The trajectory to be done is indicated. FIG. 1 shows a schematic
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side view of an example of a conventional sound image position control apparatus. In the figure,
reference numeral 1 denotes a stick, one end 1a of which is rotatably supported, and the other
end 1b draws a hemispherical trajectory by freely pivoting the stick 1 with the one end 1a as a
fulcrum. A control signal representing the mapping position of the entire stick or one point
thereof with respect to the horizontal plane 2 in the vertical direction perpendicular to the
drawing of FIG. 1 of this stick 1 represents the horizontal plane 2 as an absolute position in twodimensional coordinates. It is obtained from the output of a variable resistor (not shown) whose
resistance value changes in response to the movement of the stick 1 and is supplied to the abovementioned signal conversion device. Thus, the stick 1 designates the position of the sound image
localized in space by the pinaural signal, or the movement locus of the sound image whose
localization position is moved. FIG. 2 shows a schematic front view of another example of the
conventional sound image position control apparatus.
A volume 3 controls the position of the sound image by changing the volume level ratio
generated by the left and right speakers (not shown) by turning. That is, this method is referred
to as level difference localization, but when the volume 3 indicates the center position of C, the
volume levels of the left and right speakers are both the same, and the sound image is localized
at the center in advance. When the signal being sung is reproduced, the sound image is
positioned at the center. Even in this case, as the volume 3 is turned counterclockwise in FIG. 2,
the sound level of the left speaker is reduced. The sound is gradually moved to the left toward
the listener, and the sound image position is gradually moved to the right as it rotates clockwise.
The volume 3 can perform the one-dimensional sound image localization and the movement of
the sound image localization position by the above-described level variable, and can also perform
the one-dimensional five-image localization position display described above. The apparatus
shown in FIG. 1 can also perform sound image localization, movement and display thereof by the
level difference localization method. Therefore, in the conventional apparatus shown in FIG. 1,
the imaging position of Stick-1- relative to horizontal plane 2 is represented as distance r from
the origin in the two-dimensional coordinate of horizontal plane 2 and angle θ based on a
certain direction EndPage: The distance from the origin to the infinity is divided by n (arbitrary
integer), and the angle θ is also divided by m (arbitrary integer) into 3600 and the stick The
position in space 1 was to be detected. Therefore, in order to move the sound image smoothly, it
is necessary to take KVi and the above-mentioned number of divisions large, and therefore, the
stick 1 is copied as the stick 1 approaches K perpendicular to the horizontal plane 2 (which
becomes the origin position at this time). Less I! Even if the sound image does not move rapidly,
it can not move because the sound image is moved by moving the stick 1 artificially. Met'. On the
other hand, in the case of the conventional wearing shown in FIG. 2 as well as above, as the
division number for the rotation angle must be taken as many as possible for smooth movement
of the sound image, It was awkward to move tp 7k slightly to make it turn. In addition, the
conventional devices Ijt shown in FIGS. 1 and 2 both manually control the on-the-fly status, so
the operation is complicated. The non-invention eliminates the above-mentioned drawbacks and
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will be described with reference to FIG.
□ FIG. 3 is a block diagram showing the basic configuration of the device of the present
invention. In the same □□□, it is made to be variable by the control pulse of the wave number
wax terminal 5 of the oscillation station wave number with four company variable frequency
transmitters. The output signal of the variable frequency oscillator 4 is supplied to each of the
gate circuit 6 and IK. The gate circuits 6 and 7 are controlled to open and close by means of the
gate control which is input from the terminals 8 and 9. 10.11 are gate circuits 6. It is an up /
down counter that counts or subtracts the input signal from T (the output signal of the variable
frequency oscillator 4). The up / down counter 10 displays the distances from the origin O to
infinity and large distances and each distance section where @ is previously divided and assigned
n in binary numbers (here, for convenience, 5-bit binary data is used. ). That is, the R1 point O is
DOO, O, DJ, the 14th distance section is 000 mouth 1 , the second distance section is 0
0 010, J,. When 31) / fi 11111 is displayed. Here, the origin a is taken as the central point
between the listeners' ears. Also, the nth distance section is from a certain value to infinity. On
the other hand, the angle θ based on the up / down counter 11 direction is displayed as a 5-bit
binary number for convenience, and an angle of 360 ° is divided into m to display all the
allocated angles. That is, since the up / down counter 11 displays the angle here as a 5-bit binary
BCD, it represents an angle divided by 32 ° of 360 °. ・ For example, when 00, O [1000 J is
displayed. The up / down counter 10 displays the distance r and outputs a digital 1 δ number
corresponding to the display distance section as a control signal (rl) from the output terminal 12
and the rough up / down counter 11 outputs the angle θ And the digital 1 .delta. Number
corresponding to the display angle as a control signal (.theta.,) And output from the blade
terminal 13. As shown in FIG. And 2t indicate the localization position 4rlpθj) of the sound
image represented by the polar acne. Next, one embodiment of the device of the present
invention will be described. FIG. 4 shows a block system diagram of one embodiment of the
device of the present invention, and in the figure, the same reference numerals as in FIG. 14.
Is is a voltage controlled oscillator as an example of a variable frequency oscillator, and its
oscillation frequency is variably controlled by a control voltage applied from terminals 18.17.
The oscillation frequencies of the voltage control oscillators 14 and 15 correspond to the moving
speed of the sound image. That is, by controlling each output oscillation frequency of the voltage
control oscillator 14.15, the input clock to the up / down counter 1o, z changes, and the change
rate of the distance and angle changes.
In this case, the gate circuit 6.1 is controlled by the gate control signal from the terminal 8.9, but
when any of the gate circuits 6, 7 is closed, the counting of the up / down counters 10, 11 Since
the motion stops, the sound image does not move, is stationary, and is localized at a desired
position in space. The up / down counters 10 and 11 are forcibly controlled to either the
addition counting operation or the subtraction counting operation by the up / down control
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signal which is applied from the terminals f, 8 and III and EndPage: 3. The output signal of the up
/ down counter 10 is output as a digital control signal giving information on the distance from
the origin of the sound image to be localized or moved from the output terminal 20, while the D /
A converter 21 converts it into an analog signal. The signal is converted and output as an analog
control signal that gives distance information from the origin of the output terminal 22 to the
sound image. Also, while the output signal of the up / down counter 11 is output as a digital
control signal giving information on the angle made with respect to a certain reference direction
of the sound image to be localized or moved from the output terminal 23, the DA converter The
signal is converted into an analog signal by an analog signal 24 and output from the output
terminal 25 as an analog control signal which gives information on the angle between the sound
image and a reference direction. The above output terminal 20. For example, the control signal
giving distance information from '12 and the control signal giving angle information from upper
2 output terminals 23 and '25 are, for example, the above-mentioned signals. Control ΔP, Δφ
of natural sound image localization f 'taking into account the correlation between the signal level
difference (ΔP) and phase difference (Δφ) at the positions of the listener's both ears as
described in the monthly issue It is also used as a control signal in the level difference
localization method described above. In this way, a pinaural signal obtained by using a signal
having no localization information as a control signal for converting a signal into a pinaural
signal, or a control signal in a level difference localization method, etc. It is listened to by
headphones, or the crosstalk component is canceled in advance and sound is generated from the
speaker. Or, the localization or localization position is automatically moved into space in
accordance with the distance between the sound and the output of the up / down counters 10
and 11 and the angle corresponding to the sound produced by the signal generated from the
speaker. The sound image localization method by the ΔP-Δφ method described in the above
NHK Giken monthly report, or the method of sounding a pinaural signal from a speaker to
localize the sound image at a desired position in the sound field, is shown in FIG. The left ear
entrance of the listener 26 when the listener + 26 hears that the sound image is localized at P (rtt
θ j) within the sound field of the sound produced by the speakers 27, 28 ', 29' and 30 ' Volume
level and phase at pL +?
Assuming that the volume level and phase at the L right ear inlet are p and yR, respectively, the
speaker 26 sounds such that the level difference ap (−pL−pn) and the phase difference d ψ (−,
5 / knee yR) are given to the listener 26 It is something to be pronounced from 27-30. The
operation in the case where the localization position of the sound image is automatically stopped
or moved using the output control signal of the device of the present invention as a control signal
for converting into the above-mentioned pinaural signal will be described in more detail. FIG. 6 is
a front view of the appearance of an embodiment of the device according to the present
invention, in which the localization position of the first sound image is previously set by the
preset button 31. When the start switch 32 is pressed, the circuits of FIG. 4 become operative.
When 33 is an approach switch and 34 is a far switch and neither of them is pressed, the gate
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circuits 6, 7 in FIG. 4 are both closed, and the sound image is stopped at the preset position by
the preset button 31. doing. When the access switch 33 is pressed, a signal for causing the up /
down counter 10, for example, to count down is applied from the terminal 18, and at the same
time the gate control signal from the terminal 8 opens the gate circuit 6, thereby the voltage
controlled oscillator 14 The out-force signal begins to be decremented by the up-down counter
10. This allows the listener to hear that the sound image is approaching. On the other hand,
when the remote switch 34'lr: is pressed, a signal for adding and counting the up / down counter
10 is applied from the terminal 18, and at the same time the gate circuit 6 is opened, thereby the
output signal of the voltage control oscillator 14 Is started to be added and counted by the up /
down counter 10, and the output control signal of the output terminal 20.22 is controlled to
move the sound image far from the listener. 35 is a counterclockwise switch, 36 is a clockwise
switch, and when EndPage pressed with these switches 35 or 36: 4, a signal for performing
subtraction / addition counting operation of the up / down counter 11 from the terminal 19 Is
applied to the up / down counter 11, and with this output control signal of the six output
terminals 23. 25 (the sound image moves by 11 width counterclockwise or clockwise with
respect to the listener). At this time, both of the proximity switch 33 and the far switch 34 are
pressed. When it is not, the sound image continues to rotate leftward or rightward along a
circular orbit of a certain radius centered on the listener (this radius is determined by the output
of the up-down counter 10).
On the other hand, when either the left turn switch 35 or the right turn switch 36 'is pressed, and
when any one of the access switch 33 and the far switch 34 is pressed, it is determined from the
above description. As is also apparent, the sound image draws a helical trajectory relative to the
listener and either approaches or moves far. The movement speed of the above sound 1 wall
changes the control voltage value applied to the voltage control oscillators 14 and 1.5 from the
terminal 16.17 by moving the back and forth movement speed adjustment volume 37 three
times, By varying the output oscillation frequency of the control oscillators 14, 15, it is variably
adjusted arbitrarily. The higher the oscillation frequency, the faster the moving speed of the
sound image. The movement of the sound image described above is stopped by closing the gate
circuits 6, 7 by the gate control signal applied from the terminal 8.degree. 9 by pushing the stop
switch 38, and is stopped by this, and the sound image is stopped at this stop position. become.
Since the device according to the present invention does not manually control the localization
position of the sound image as in the prior art but can automatically perform this, when moving
the sound image, at least one of the division numbers for direction and distance It is easy to set a
free localization position at any speed from a step (one division section) and at any position in
the sound field. In FIG. 6, s'39's4 ◎ is the one-step switch of Utameme that moves the sound
image in the approaching direction of the one step and the distant direction respectively, and the
41't 42 is in the left-turning direction, around 4 turns. Each is a one-step switch for moving a
one-step sound image. Also, 41L and 41RFi, left channel switch and right channel switch for
moving the sound image to the preset positions in the sound field of the left and right halves of
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the listener respectively, making this unnecessary by predetermining the circuit constants You
can also. Although the start switch 32 is provided in FIG. 6, this switch does not necessarily need
to be provided exclusively, and switches having other functions (for example, the proximity
switch 33, the far switch 34, the counterclockwise switch 35 or the like) It can also be used as
the clockwise switch 36). Further, in FIG. 4, when the digital control signal from the output
terminal 20.23 is input to a computer, for example, the localization position of the sound image
can be artificially controlled by the program. The analog control signal from the output terminal
22.25 is applied to, for example, the voltage control amplifier (vCA) in the signal converter
described above.
The above analog control signal and digital control signal do not necessarily have to be used at
the same time, and it is of course possible to selectively use either of them depending on the type
of subsequent circuit. Further, in the embodiment shown in FIG. 4, the moving speed of the
sound image is varied by controlling the output oscillation frequency of the voltage control
oscillator 14.15, but it is essential that the frequency is changed by the control signal. Anything
can be used if it is. Further, the oscillation input signal to the up / down counters 10 and 11 is
gate circuit 6. Although the configuration for passing or blocking by T has been described, the
present invention is not limited to this method. For example, the oscillation operation of the
voltage controlled oscillator ti or 15 is stopped or the counting operation of the up / down
counters 10 and 11 is stopped. You may make it Furthermore, the output control signal of the
device of the present invention has also been used as a control signal for changing the volume
level ratio of the above-mentioned level difference localization method. As described above, in the
automatic sound image position control apparatus according to the present invention, the output
signal of the counting means obtained by counting the output signal of the oscillator in the
counting means provided with the means controlled by the counting means EndPage: 5 of the
distance information between the sound image position to be expected and the listener and the
angle information with reference to a certain direction, and it has information of one side or the
other, and the signal that does not have localization information Since the sound image is
localized at the desired position in the sound field or output as a control signal for converting the
sound image to the desired position, the localization position of the sound image is automatically
shifted to an arbitrary position in the sound field. It can be moved or stopped, so that the
operation is extremely simple compared to the conventional one, and since the electronic control
is performed, the localization position of the sound image can be extremely accurately controlled
as compared to the conventional one. Also, it is possible to set in advance a slight movement of
the sound image position and a movement of a dog, and the program can control the sound
image position artificially and also by the computer, and uses a variable frequency oscillator as
the above oscillator and Since the means for changing the output oscillation frequency from the
outside is provided, it is possible to automatically and accurately change the moving speed of the
sound image moved to an arbitrary position in the sound field. It has several 4 features such as
being able to indicate the direction, speed, final movement position, etc.
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4. Brief description of the drawings. FIG. 1 is a schematic side view of an example of a
conventional automatic sound image position control apparatus, FIG. 2 is a schematic front view
of another example of the conventional automatic sound image position control apparatus, and
FIG. FIG. 4 is a block diagram showing a basic configuration of an embodiment of the invention
device, FIG. 4 is a block diagram of an embodiment of the invention device, and FIG. 5 is for
explaining the relationship between a listener and a sound image in a sound field. FIG. 6 is a front
view of the appearance of an embodiment of the device of the present invention. 1 ... stick, 3 ...
volume, 4 ... variable frequency oscillator, 10, 11 ... up-down counter, 12. . 20.22 ··· Control signal
output terminal for giving distance information, 13, 23, 25 ··· Control signal output terminal for
giving angle information, 16. 17. ··· Control voltage input terminal, 1'8. . 19 · · · · · · · down control
signal input terminal, 33 · · · approach switch, 34 · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · ·
· · · · · · · · · · · · · · switch Volume. Patent applicant Nippon Victor Co., Ltd. \, Attorney Attorney
Tadohiko Ito 'Fig.1 Fig.6 Fig.6 Fig.5 Fig.6 Fig.2EndPage: 6
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