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DESCRIPTION JPH07231499

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DESCRIPTION JPH07231499
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a
sound image position control method for electrically controlling the direction in which sound is
heard in the field dealing with sound, such as a stage or a broadcast site, and in particular, any
sound image up and down direction. It is configured to be able to control at the position.
[0002]
2. Description of the Related Art An apparatus described in Japanese Patent Application LaidOpen No. 60-248099 is known as an apparatus for controlling sound effects on the stage. This
apparatus, as shown in FIG. 4, includes a plurality of microphones 26a to 26m, amplification
devices 25a to 25m for amplifying audio signals, an adder / distributor 30 for adding and
distributing amplified signals, and delay necessary for audio signals. Delay devices 29a to 29d for
adding the signals, an adder / distributor 24 for adding and distributing the delayed audio signal
again, speakers 23a to 23n for emitting the sound toward the audience seat, amplification
amount of the amplifying device, delay time of the delay device, An adjustment control device 28
is provided which adds and synthesizes the sound signals collected by the microphones and
adjusts the ratio of distribution to the speakers.
[0003]
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The microphones 26a to 26m and the speakers 23a to 23n are installed at various places on the
stage, as shown in FIG. Of these microphones, 26a and 26b are microphones carried by solo
performers, and serve as sound sources for solo performers.
[0004]
The acoustic signals collected by the microphones 26a to 26m are amplified to the required size
by the amplifying devices 25a to 25m, passed through the adding and dividing device 30, and
given the necessary delay time by the delaying device 29, and then added and added. The sound
is emitted from the speakers 23a to 23n through 24.
[0005]
If the solo performer carrying the microphones 26a and 26b moves, the sound source moves in
the same manner.
In the adjustment control device 28, a large number of key switches are arranged in a matrix by
imitating the geometric shape of the performance area 21, and when the key switch
corresponding to the position of the solo performer is pressed, the microphone 26a of the solo
performer The sound pressure level is adjusted to the level corresponding to the position and the
delay time corresponding to the position is added to the sound collected at step. When the sound
adjusted in this way is emitted from each of the speakers 23a to 23n, the spectator in the
passenger seat 22 feels that the voice of the performer is heard from the position where the
performer is present.
[0006]
As described above, by adjusting the sound pressure level ratio and the time difference of the
sound flowing from the plurality of speakers, the position of the sound image can be arbitrarily
controlled. This is because the audience recognizes the direction (sound image position) of the
sound by the difference in sound reaching the left and right ears, and changes the sound
pressure level ratio and time difference of the sound flowing from the multiple speakers to the
left and right ears. This is because when the sound to be reached has a difference, the sound
image position seems to move.
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[0007]
However, although the conventional sound image position control device can control the lateral
position of the sound image, it controls the height of the sound image, that is, changes the
position of the sound image in the vertical direction. You can not move the sound image up or
down. When the sound source moves in the lateral direction, differences occur in the volume and
arrival time of the sound reaching the listener's left and right ears, and the conventional sound
image position control device simulates this difference by artificially creating this difference.
Control the position. However, when the sound source is moved in the vertical direction in front
of the listener or moved directly behind the listener, there is no difference in the volume and the
arrival time of the sound reaching the listener's left and right ears. Therefore, vertical control of
the sound image position can not be performed by the conventional method.
[0008]
The present invention is intended to solve such conventional problems, and it is an object of the
present invention to provide a sound image position control method capable of arbitrarily
changing the vertical position of a sound image.
[0009]
Therefore, in the present invention, in order to control the vertical position of the sound image in
the sound field, the measurement signal is emitted to the sound field, and the dummy disposed at
the listening position of the sound field. The relative sound pressure level of the critical band in
the sound field is measured by the head microphone, and the difference between the measured
value and the data of the relative sound pressure level at a predetermined position in the vertical
direction of the sound image created by experiment in advance is determined. The characteristics
of the frequency equalizer are adjusted so as to eliminate the problem, and the frequency
characteristics of the listening signal radiated to the sound field are corrected by this frequency
equalizer.
[0010]
Also, white noise or impulse is used as the measurement signal.
[0011]
For this reason, by correcting the relative sound pressure level of the critical band to the relative
sound pressure level when the sound image is at the predetermined position in the vertical
direction, the listener actually has the sound image at that position. You can listen to
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[0012]
First Embodiment In the present invention, the vertical position of the sound image is controlled
based on the following principle.
As described above, even if the sound source located in front of the listener is moved up and
down, there is no difference in the sound that enters the listener's left and right ears.
However, even in that case, we can recognize whether the sound is coming from the top or the
bottom, and we can also identify the sound coming from behind.
This is because the transfer frequency characteristic from the sound source to the ear changes
under the influence of the head and pinnae in accordance with the upper and lower direction of
the sound source, and the listener recognizes this change in frequency to (This point is
suggested, for example, in J. Blauert, "Sound Localization in the Median Plane", Acustica, vol. 22,
pp. 205-213 (1967/1970)).
Therefore, in the present invention, by giving a predetermined frequency change according to
the vertical position of the sound image to be set to the sound to be heard by the listener, the
listener can hear the sound from that position. Make me feel.
[0013]
In this specification, not only the height of the sound image in front of the listener, but also the
height in the back and top are expressed as "the vertical direction of the sound image".
[0014]
Also, masking is a phenomenon in which one sound becomes inaudible due to the presence of
another sound, but our ears divide the frequency band into several widths, and each masking is
uniform for each frequency bandwidth. Filter processing.
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That is, our ear can be viewed as a band-pass filter group with variable center frequency, and the
frequency band of each width is called a critical band. The loudness of the broadband spectrum
that can be heard by the ear can be determined by adding the loudness of each critical band.
[0015]
Now, the apparatus of the first embodiment for implementing the sound image position control
method of the present invention is, as shown in FIG. 1, a measurement white noise generator 2
for outputting white noise for measurement, and this measurement has been completed. A sound
source signal generator 11 for outputting sound to be heard to a listener later, a sound source
signal switching device 3 for switching and outputting a signal from the sound source for
measurement and a signal from the sound source for listening, and Amplifier 4, a speaker 5 for
emitting sound to the sound field 1, a dummy head microphone 6 disposed opposite to the
speaker 5 in the sound field 1, and critical bands for sounds heard by the dummy head
microphone 6. Critical band filter 7, which divides the frequency band, sound pressure level
measuring instrument 8 for measuring sound pressure level, up and down direction control
database 9 of sound image created by previous experiments, measured sound pressure level and
up and down direction of sound image Control database It includes the difference calculation unit
10 for calculating a difference between data, and a frequency equalizer 12 to correct the
frequency characteristic of the listening sound signal.
[0016]
The sound image vertical direction control database 9 is obtained from the measurement of the
head related transfer function using a dummy head.
This measurement is performed in an anechoic chamber, with the dummy head microphone and
the speaker facing each other in the anechoic chamber, and the speaker is held so that the
elevation angle to the dummy head microphone can be varied. Next, white noise is emitted from
the speaker while keeping the elevation angle constant. At this time, the sound measured by the
dummy head microphone is divided into bands by the critical band filter, and the relative sound
pressure level in each critical band is measured. Record. These measurements are repeated while
changing the elevation angle by a constant angle to create a vertical control database of the
sound image.
[0017]
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The position of the sound image in the vertical direction is controlled as follows using this device.
The speaker 5 and the dummy head microphone 6 are disposed to face each other in the sound
field 1 whose sound image position is to be controlled, and the white noise generator 2 for
measurement generates white noise for measurement. The white noise is amplified by the
amplifier 4 and then emitted from the speaker 5 into the sound field 1 as a source signal. The
emitted measuring sound source signal is received by the dummy head microphone 6 placed at
the listening position of the sound field 1, and the dummy head microphone 6 measures the
sound to be input to the left and right ears of human being at the listening position. Do. The
signal measured by the dummy head microphone 6 is output to the critical band filter 7, where
the signal is divided into the respective critical bands, and then the relative sound pressure level
of each critical band is calculated by the sound pressure level measuring device 8.
[0018]
The relative sound pressure level of each critical band calculated by the sound pressure level
measuring device 8 is output to the difference calculator 10. The difference calculator 10 reads
out the data of relative sound pressure level of each critical band at the designated elevation
angle from the vertical direction control database 9 of the sound image, and the difference
between this value and the value inputted from the sound pressure level measuring device 8 And
outputs the result to the frequency equalizer 12. The frequency equalizer 12 adjusts its equalizer
characteristics so as to make this difference 0, and stores the adjusted value.
[0019]
Next, the listener is seated at the position of the dummy head 6 of the sound field 1 (or in the
vicinity of the dummy head) and the sound source signal switching device 3 is switched to the
sound source signal generator 11 side for listening. A sound source signal for listening is
generated from the unit 11, and the frequency characteristic of the sound source signal for
listening is corrected by the frequency equalizer 12.
[0020]
The signal of the listening sound source whose frequency characteristic has been corrected is
amplified by the amplifier 4 and then emitted from the speaker 5 into the sound field 1.
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The listener who listens to this sound can feel that the sound image is at the position of the set
elevation angle.
[0021]
As described above, in the sound image position control method of the first embodiment, the
white noise signal measured by the dummy head microphone 6 is divided into bands by the
critical band filter 7, and the sound pressure level measuring device 8 compares the relative
sound pressure of each critical band. The level is calculated, the difference between the sound
image and the data in the vertical control database 9 is calculated by the difference calculator 10,
the result is output to the frequency equalizer 12, and the correction characteristic
corresponding to the predetermined elevation angle is output to the frequency equalizer 12.
Then, the frequency equalizer 12 corrects the frequency of the listening sound source signal
generated from the listening sound source signal generator 11. By doing so, the sound image
position felt by the listener can be arbitrarily controlled.
[0022]
Second Embodiment As shown in FIG. 2, in the apparatus of the second embodiment, the impulse
response received by the dummy head microphone 6 is Fourier-transformed by using the
impulse generator 13 for measurement that generates impulses as a measurement signal. And a
Fourier transformer 14 for frequency conversion. The other configuration is the same as that of
the first embodiment.
[0023]
In this device, the impulse generated from the measurement impulse generator 13 is amplified
by the amplifier 4 and then radiated into the sound field 1 through the speaker 5. The dummy
head microphone 6 measures this impulse response and outputs it to the Fourier transformer 14.
The Fourier transformer 14 performs Fourier transform on the input signal to obtain its
frequency spectrum, and the sound pressure level measuring unit 8 The relative sound pressure
level in each critical band of the signal output from the Fourier transformer 14 is calculated. The
subsequent operation is the same as in the first embodiment.
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[0024]
As described above, in the second embodiment, it is possible to control the positions of the upper
and lower positions of the sound image by using an impulse as the measurement signal.
[0025]
As is apparent from the above description of the embodiment, the sound image position control
method of the present invention can set the sound image to any position in the vertical direction,
and handles the sound such as a stage or a concert hall. The range of sound effects can be
broadened in various fields.
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