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DESCRIPTION JP2005265480

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DESCRIPTION JP2005265480
An object of the present invention is to provide a field measurement system capable of
suppressing the amount of calculation involved in calculation of the distribution of the object to
be calibrated while adopting a free scan sensor system. A main sensor (12) capable of arbitrarily
moving within a test site, and fixed at a position at which the test site can be photographed, the
main sensor (12) A video camera (13) for detecting coordinates in a plane perpendicular to the
optical axis (AX), and fixed to the video camera for detecting the coordinates of the main sensor
in the optical axis direction toward the examination site In a field measurement system including
a transmitter (13c) for transmitting a measurement wave, a wave source of the transmitter (13c)
is set on an optical axis (AX) of the video camera (13). [Selected figure] Figure 1
Field measurement system, wave source search method, and wave source search program
[0001]
The present invention relates to a field measurement system for measuring the distribution of the
object to be calibrated in the examination site, a method of searching for a wave source for
identifying a wave source of the wave to be detected based on a complex amplitude distribution
of wave to be detected It relates to a wave exploration program to be run.
[0002]
There is a growing demand for quietness in office automation equipment and home appliances
because of a comfortable living environment.
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1
These devices are subjected to sound field measurement (sound pressure distribution
measurement) before shipment. If the distribution of the complex sound pressure is measured,
and the technique of sound source search such as phase shift method (beam former, beam
forming) or acoustic holography is applied to the measurement result, the parts or members
serving as the sound source are identified It can also be done.
[0003]
The conventional sound field measurement system detects the sound pressure at each position
by arranging the microphones in an array or scanning the inside of the test sound field with the
microphones using a precision stage. The present inventors have proposed introducing a "free
sensor system" to this sound field measurement system (non-patent document 1 etc.). In this
sound field measurement system, the measurement person can hold the microphone and scan
arbitrarily. Instead, on the system side, the sound field of the test is video-captured by the
camera, the position coordinates of the microphone are automatically recognized by the
computer from the shooting data of the camera, etc., and the position coordinates are correlated
with the output of the microphone Determine pressure distribution.
[0004]
Incidentally, in this free scan sensor system, an ultrasonic wave transmitter is provided on the
front of the camera, and an LED marker is provided on the front of the microphone. The
ultrasonic pulse transmitted from the ultrasonic wave transmitter is used to increase the
recognition accuracy of the coordinate in the optical axis direction of the microphone, and the
microphone is labeled by the LED marker to be perpendicular to the optical axis of the
microphone Coordinate recognition accuracy is improved. Yoshiteru Natsuteru, Nakamura
Kentaro, Ueha Hajime, "Real-time sound field visualization system with free-scan microphone (2)Three-dimensional position detection of microphone-," Proceedings of the Acoustical Society of
Japan, The Japan Acoustical Society, March 2003 , Item 2-11-6, P 1367-1368.
[0005]
However, in this sound field measurement system, the computation load on the computer is large
in order to automatically recognize the coordinates of the microphone, and the measurement
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2
time tends to be extended. Although the method of sound source search is known, the
measurement data obtained by the free scan sensor system is data of sound pressure at random
coordinates, so even if the method of sound source search is applied as it is, the sound source
can not be specified well.
[0006]
Therefore, an object of the present invention is to provide a field measurement system capable of
suppressing the amount of calculation involved in the calculation of the distribution of the object
to be calibrated while adopting a free scan sensor system. Another object of the present
invention is to provide a method of detecting a wave source which can reliably perform a sound
source search while adopting a free scan sensor system. Another object of the present invention
is to provide a wave source scanning program for causing a computer to execute the wave source
searching method of the present invention.
[0007]
The field measurement system according to claim 1 can move arbitrarily in the examination site,
and is fixed at a position at which the examination site can be photographed, and a main sensor
that detects the calibration object. A video camera for detecting coordinates in a plane
perpendicular to the optical axis of the sensor; and a measuring wave fixed to the video camera
for detecting coordinates in the optical axis direction of the main sensor toward the examination
site In a field measurement system comprising a wave transmitter, the wave source of the wave
transmitter is on the optical axis of the video camera.
[0008]
The field measurement system according to claim 2 is the field measurement system according to
claim 1, wherein the transmitter includes a vibrator for generating a sound wave for detecting
the coordinate, and the vibrator is It is characterized in that it is a cylindrical vibrator whose
central axis coincides with the optical axis of the video camera.
The field measurement system according to claim 3 is the field measurement system according to
claim 2, wherein the main sensor is a microphone that detects sound pressure as the subject of
calibration, and receives the sound wave for coordinate detection. It is characterized in that the
sensor doubles as a sensor that detects the coordinates of the main sensor in the optical axis
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direction by wave.
[0009]
The field measurement system according to claim 4 can move arbitrarily in the examination site,
and is fixed at a position at which the examination site can be photographed, and a main sensor
that detects the calibration object. A field measurement system comprising: a video camera for
detecting coordinates in a plane perpendicular to an optical axis of a sensor; and a light emitter
fixed to the main sensor for a sign for the video camera, wherein The arrangement pattern is
characterized in that the arrangement pattern is symmetrical with respect to the sensor unit of
the main sensor.
[0010]
The field measurement system according to claim 5 can move arbitrarily in the examination site,
and is fixed at a position at which the examination site can be photographed, and a microphone
for detecting a sound pressure as the examination object, A video camera for detecting
coordinates in a plane perpendicular to the optical axis of the microphone, and a sound wave for
detecting the coordinates of the optical axis direction of the microphone fixed to the video
camera and directed to the examination site. Measuring system, the microphone also serves as a
sensor that receives the sound wave for detecting the coordinates and detects the coordinates in
the direction of the optical axis, and the microphone and the video camera In the above, a singaround method in which the transmission timing and the reception timing of the sound wave for
coordinate detection are associated with each other is applied.
[0011]
The sound source searching method according to claim 6 can move arbitrarily in the examination
site, and the main sensor detects the complex amplitude of the detection based on the
predetermined position in the examination site; A source search method applied to a field
measurement system comprising a detection means for detecting position coordinates of the
main sensor in a checkup site, wherein data of the detected complex amplitude is detected at the
same timing. A procedure for associating with the position coordinates, a procedure for
performing interpolation and / or thinning processing of the data associated with the position
coordinates so as to become data of each coordinate regularly arranged in the examination site,
and the processed data And a procedure for searching for a wave source in the examination site
based on the above.
[0012]
The sound source searching program according to claim 7 can move arbitrarily in the
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examination site, and the main sensor detects the complex amplitude of the detection based on
the predetermined position in the examination site, and the subject It is a sound source search
program for a computer applied to a field measurement system comprising a detection means for
detecting the position coordinates of the main sensor in a checkup site, wherein the detected
complex amplitude data is given at the same timing. A procedure for correlating the detected
position coordinates, a procedure for interpolating and / or thinning out data associated with the
position coordinates so as to become data of each coordinate regularly arranged in the
examination site, and the process And e. Searching for a wave source in the examination site
based on the data.
[0013]
According to the present invention, it is possible to realize a field measurement system capable of
suppressing the amount of calculation necessary for calculation of distribution while adopting a
free scan sensor system.
Further, according to the present invention, a source search method is realized which can reliably
perform source search even while adopting a free scan sensor system.
Further, according to the present invention, a wave source search program for making a
computer execute the wave source search method of the present invention is realized.
[0014]
First Embodiment A first embodiment of the present invention will be described with reference to
FIG. 1, FIG. 2, FIG. 3, and FIG.
The present embodiment is an embodiment of a sound field measurement system in which a free
scan sensor system is adopted.
The present system measures the sound field (sound pressure distribution measurement) around
the sound source 11 as shown in FIG. A sound wave of a predetermined wavelength range
emitted from the sound source 11 (hereinafter referred to as an audible sound wave). ) Is the test
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sound wave.
[0015]
First, the overall configuration of the present system will be described. As shown in FIG. 1, the
system includes a main microphone 12, a video camera 13, a reference microphone 14, a
computer 16, and the like. The main microphone 12 has a size and weight that can be supported
by the measurer, and is freely scanned within the sound field by the measurer, for example, as
indicated by the arrows in FIG.
[0016]
At this time, the main microphone 12 repeatedly receives the test sound wave at a predetermined
sampling cycle, and repeatedly outputs a signal (sound pressure signal) indicating the complex
sound pressure P. The value of the complex sound pressure P is expressed by the amplitude A of
the test sound wave and the value of the phase φ, and hence the complex sound pressure is
hereinafter referred to as “P (A, φ)”. The video camera 13 is fixed at a position where the
entire sound field including the main microphone 12 can be captured, and continuously outputs
a signal (image signal) indicating an image of the sound field. For the video camera 13, for
example, a CCD camera is used.
[0017]
The reference microphone 14 is fixed at a predetermined position in the sound field to be
detected, repeatedly receives the sound wave to be detected at the predetermined position at the
same timing as the main microphone 12, and indicates the phase (reference phase) φ0
(reference phase signal Output). In the vicinity of the lens barrel 13 b of the video camera 13,
sound waves of wavelengths outside the wavelength range of the test sound wave (hereinafter
referred to as ultrasonic waves). ) Is repeatedly provided. As the transmitter 13c, for example, an
air ultrasonic transducer with a resonance frequency of 40 kHz is used.
[0018]
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The ultrasonic waves transmitted from the transmitter 13 c are received by the main microphone
12 together with the test sound wave. The main microphone 12 outputs a signal (distance signal)
indicating the coordinate Z of the main microphone 12 in the optical axis AX direction with
reference to the video camera 13 at the received timing. An LED marker 12 b is provided near
the sound receiving unit 12 a of the main microphone 12. For example, a super bright LED is
used as the LED marker 12 b. The LED marker 12 b serves to mark the main microphone 12.
[0019]
Next, processing in the computer 16 will be described. The computer 16 sequentially takes in the
sound pressure signal from the main microphone 12, the distance signal, the reference phase
signal from the reference microphone 14, and the image signal from the video camera 13. The
complex sound pressure P (A, φ) is recognized from the sound pressure signal, and the reference
phase φ0 is recognized from the reference phase signal.
[0020]
The phase φ of the complex sound pressure P (A, φ) is converted into a difference value Δφ
from the reference phase φ0 detected at the same timing. Hereinafter, the complex sound
pressure represented by the difference value Δφ is represented as P (A, Δφ). Further, from the
distance signal, the coordinate Z in the direction of the optical axis AX of the main microphone
12 is recognized. Further, the coordinates (X ', Y') of the main microphone 12 on the image are
recognized from the image signal (however, the coordinate origin: the center of the image).
[0021]
At this time, the computer 16 recognizes the coordinates on the image of the LED marker 12b
(however, the coordinate origin: the center of the image), and the coordinates are determined by
the positional relationship between the LED marker 12b and the sound receiving unit 12a of the
main microphone 12. Based on the coordinates (X ′, Y ′) of the main microphone 12 (where
the coordinate origin is the image center). Further, the position coordinates (X, Y, Z) of the main
microphone 12 are recognized from the coordinates (X ′, Y ′) and the coordinates Z described
above.
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[0022]
At this time, the computer 16 corrects the coordinates (X ′, Y ′) according to the coordinates
Z, and obtains coordinates (X, Y) in a plane perpendicular to the optical axis AX of the main
microphone 12. The combination (X, Y, Z) of the coordinates (X, Y) and the coordinates Z is the
position coordinates (X, Y, Z) of the main microphone 12. Furthermore, the computer 16 detects
the complex sound pressures P (A, Δφ) sequentially recognized and the position coordinates (X,
Y, Z) sequentially recognized, which are detected at the same timing. It matches and memorizes.
[0023]
Hereinafter, data of a certain complex sound pressure P (A, Δφ) associated with a certain
position coordinate (X, Y, Z) is represented by “Pi” (where i is a coordinate). Each data P1, P2,
P3... Indicate the distribution of complex sound pressure in the sound field to be measured. The
computer 16 displays a video-captured image on the screen 16a, and draws the locus of the main
microphone 12 as a curve on the image. The locus is obtained from the coordinates (X, Y) of the
main microphone 12 which are sequentially recognized.
[0024]
This allows the measurer to visually confirm how the main microphone 12 has been scanned.
The computer 16 can also display the amplitude A of the test sound wave together on the screen
16a. For example, the magnitude of the amplitude A is displayed by the color of the curve. This
allows the measurer to visually confirm where on the screen a strong sound is being produced.
[0025]
For example, a notebook computer having a clock frequency of 2.2 GHz and an A / D converter
sampling frequency of 100 kS / s is used as such a computer 16. For example, from the image
signal of the image of the area within 0.4 m perpendicular to the optical axis AX at a distance of
0.5 m, the computer 16 measures the coordinates (X ′, Y ′) of the main microphone 12 five
times a second. Automatic recognition can be made sequentially with an error of 7 mm.
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[0026]
Next, the transmitter 13c of the video camera 13 will be described in detail. As shown in FIG. 2,
the wave transmitter 13c comprises a cylindrical piezoelectric vibrator 13c-1 and a skirt-like
reflection plate 13c-2. The inner diameter of the piezoelectric vibrator 13 c-1 is slightly larger
than the outer diameter of the lens barrel 13 b of the video camera 13. The piezoelectric vibrator
13c-1 is fixed to the camera body 13a of the video camera 13 so as to cover the lens barrel 13b
in a posture in which the center line thereof is aligned with the optical axis AX.
[0027]
The inner diameter of the reflection plate 13c-2 is slightly larger than the outer diameter of the
piezoelectric vibrator 13c-1. The reflection plate 13c-2 is fixed to the camera body 13a of the
video camera 13 so as to cover the piezoelectric vibrator 13c-1 in a posture in which the center
line thereof is aligned with the optical axis AX. The direction of the reflection plate 13 c-2 is a
direction in which the widening portion faces the front (object side) of the video camera 13 and
the narrowing portion faces the rear (image side) of the video camera 13.
[0028]
In such a transmitter 13c, when the piezoelectric vibrator 13c-1 is driven, as shown in FIG. 3, the
piezoelectric vibrator 13c-1 vibrates in the direction of expanding and contracting its diameter,
and ultrasonic waves are generated. generate. The ultrasonic waves travel in the normal direction
from the outer surface of the piezoelectric vibrator 13c-1. The ultrasonic wave is reflected by the
inner wall of the reflection plate 13c-2, and then travels in front of the video camera 13
substantially parallel to the optical axis AX. That is, the wave source O of the transmitter 13c
exists on the optical axis AX behind the video camera 13, and the ultrasonic wave travels as if
generated from there.
[0029]
Next, the LED marker 12b of the main microphone 12 will be described in detail. Three LED
markers 12b are provided as shown in FIG. The three LED markers 12 b surround the sound
receiving unit 12 a of the main microphone 12 and are arranged in a symmetrical positional
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relationship with respect to the sound receiving unit 12 a. In the arrangement plane of the three
LED markers 12b, their average position coincides with the center position of the sound
receiving unit 12a.
[0030]
The three LED markers 12b are disposed on the same surface as the sound receiving unit 12a or
on the rear surface of the sound receiving unit 12a so as not to block the test sound wave
incident on the sound receiving unit 12a. The three LED markers 12b are fixed to the sound
receiving unit 12a via an arm or the like. Next, the effects of the present system will be described.
In the present system, since the ultrasonic wave source O of the transmitter 13c is present on the
optical axis AX (see FIG. 3), the origin of the coordinate Z is also on the optical axis AX. Further,
since the image center of the video camera 13 corresponds to the optical axis AX, the origin of
the coordinates (X ′, Y ′) is also on the optical axis AX.
[0031]
Therefore, when recognizing the position coordinates (X, Y, Z), the computer 16 of the present
system does not need to adjust the origin of the coordinate Z and the coordinates (X ', Y'). Thus,
the computational load on the computer 16 can be reduced. Further, in the present system, the
arrangement pattern of the three LED markers 12b is a symmetrical arrangement pattern with
respect to the sound receiving unit 12a of the main microphone 12 (see FIG. 4).
[0032]
Therefore, the calculation for the computer 16 to convert the coordinates of the three LED
markers 12 b into the coordinates (X ′, Y ′) of the main microphone 12 is only the coordinate
average of the three coordinates. Thus, the computational load on the computer 16 can be
reduced. Second Embodiment A second embodiment of the present invention will be described
with reference to FIG.
[0033]
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The present embodiment is an embodiment of a sound field measurement system in which a free
scan sensor system is adopted. Here, only differences from the sound field measurement system
of the first embodiment will be described. The difference is that a single-around method is
applied between the video camera 13 and the main microphone 12 in which the transmission
timing and reception timing of ultrasonic waves are associated. First, the circuit configuration of
the video camera 13 and the main microphone 12 to which the single-around method is applied
will be described.
[0034]
As shown in FIG. 5, the main microphone 12 is provided with a trigger circuit 12d, a frequency
counter 12e and the like. The trigger circuit 12d is disposed downstream of the filter 12c that
separates the signal of the ultrasonic wave and the signal of the test sound wave. An ultrasonic
signal is input to the trigger circuit 12d. The trigger signal generated by the trigger circuit 12d is
input to the LED marker 12b and the frequency counter.
[0035]
On the other hand, the video camera 13 is provided with a light receiving unit 13 d that detects
the light emission timing of the LED marker 12 b. The detection signal of the light receiving unit
13d is input as a trigger signal to the drive circuit 13e that drives the piezoelectric vibrator 13c1. Next, the operation of the video camera 13 and the main microphone 12 to which the singlearound method is applied will be described.
[0036]
When the drive circuit 13e drives the piezoelectric vibrator 13c-1, an ultrasonic pulse is
generated once. The ultrasonic pulse is received by the sound receiver 12 a of the main
microphone 12. The received ultrasonic pulse is separated from the sound wave to be detected
(here, an audible sound wave) in the filter 12c and is input to the trigger circuit 12d. The trigger
circuit 12d generates a trigger signal at the timing of the input and causes the LED marker 12b
to emit light once.
[0037]
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Light emitted from the LED marker 12b is detected by the light receiving unit 13d of the video
camera 13, and a detection signal from the light receiving unit 13d is supplied to the drive circuit
13e as a trigger signal. At this timing, the drive circuit 13e drives the piezoelectric vibrator 13c1. In response to this, a second ultrasonic pulse is generated from the piezoelectric vibrator 13c1. Such an operation is repeated between the camera 13 and the main microphone 12.
[0038]
If such an operation is repeated, the next ultrasonic pulse will be generated after the time until
the ultrasonic pulse is received after the generation of the ultrasonic pulse. The generation cycle
of the ultrasonic pulse indicates the distance between the video camera 13 and the main
microphone 12. In order to signal this distance, the frequency counter 12e of the main
microphone 12 counts the frequency at which the trigger signal is generated from the trigger
circuit 12d. This count value is output to the computer 16 as a distance signal.
[0039]
Next, the effects of the present system will be described. In the present system, since the singlearound method is applied, the main microphone 12 outputs a distance signal (here, the
generation frequency of the trigger signal) directly indicating the distance between the video
camera 13 and the main microphone 12. . Therefore, unit conversion performed when the
computer 16 recognizes the coordinate Z from the distance signal is extremely simple. For
example, if the unit of the distance signal is the frequency f, the conversion equation is 1 / f.
Thus, the computational load on the computer 16 can be reduced.
[0040]
If this conversion is performed by a circuit in the main microphone 12, the computational load
on the computer 16 can be further reduced. Third Embodiment A third embodiment of the
present invention will be described with reference to FIG. The present embodiment is an
embodiment of a sound source tracking method applied to a sound field measurement system in
which a free scan sensor system is adopted.
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12
[0041]
The present sound source searching method is applied to the system of the first embodiment and
executed by the computer 16. The “sound source search program” is installed in advance on
the computer 16. The computer 16 executes the following procedure in accordance with the
program. The computer 16 stores data P1, P2, P3... Measured by the system of the first
embodiment.
[0042]
Since the main microphone 12 is freely scanned in the system of the first embodiment, the
coordinates 1, 2, 3, ... of each data P1, P2, P3, ... are on the left side of Fig. 6A. As shown, they line
up randomly in each direction. Since the scanning speed is not always constant, the intervals
between adjacent coordinates are also different. In order to specify a sound source from these
data P1, P2, P3, ..., a phase shift method is applied. However, in this sound source searching
method, the following processing is performed before its application.
[0043]
First, data P 1, P 2, P 3,... Of coordinates 1, 2, 3,... Randomly arranged in the vicinity of a
predetermined plane S 1 are regularly arranged on the plane S 1 as shown in FIG. The data is
converted (projected) into data P1 ′, P2 ′, P3 ′,... Of coordinates 1 ′, 2 ′, 3 ′,. Data P1 ′
is data of coordinates existing in a predetermined area centered on coordinate 1 ′ among data
P1, P2, P3,... (Data P1, coordinate 2 of coordinate 1 in FIG. It is determined by interpolation
processing based on the data P2, etc.).
[0044]
Data P2 ′ is, among the data P1, P2, P3,..., Data of coordinates existing in a predetermined area
centered on the coordinate 2 ′ (eg, data P2 of the coordinate 2 in FIG. 6A). It is obtained by
interpolation processing based on the above. Similarly, the data P3 ', P4', ... are also determined
by interpolation processing based on any of the data P1, P2, P3, ....
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[0045]
Unnecessary data is thinned out when, for example, more than the necessary number of data
exist in the predetermined area. The computer 16 applies the phase shift method to the data P1 ',
P2', P3 ', ... obtained as described above. That is, the computer 16 phase shifts the data P1 ′, P2
′, P3 ′,... By the shift amounts δ1, δ2, δ3... And inclines from the plane S1 as shown in FIG. ..
Converted to data P1 ′ ′, P2 ′ ′, P3 ′ ′,... Of coordinates 1 ′ ′, 2 ′ ′, 3 ′ ′,.
[0046]
Further, the same transformation (projection) is performed by changing the inclination direction
or the position of the plane S1 ', and the change of the data P1', P2 ', P3', ... is referred to. The
position of the sound source 11 is specified based on the change. Next, the effect of this sound
source search method will be described. According to the present sound source searching
method, data P1, P2, P3, ... of coordinates 1, 2, 3, ... aligned randomly are regularly aligned with
coordinates 1 ", 2", 3 ", ... Since the data P1 ′ ′, P2 ′ ′, P3 ′ ′,... Of the data, it is possible to
reliably specify the position of the sound source 11 by applying the known phase shift method
with certainty.
[0047]
[Others] In the third embodiment, data P1, P2, P3,... Are subjected to interpolation and thinning
processing and then phase shift is performed. However, the phase is performed on data P1, P2,
P3,. Shifting, interpolation and decimation may be performed simultaneously. In that case, the
phase shift amounts δ1, δ2, δ3... Are corrected with different correction amounts.
[0048]
In the third embodiment, the phase shift method is applied. However, acoustic holography may
be applied instead of the phase shift method. In the first embodiment, the three LED markers 12b
in which the XY coordinates of the position of the center of gravity coincide with the XY
coordinates of the position of the sound receiving unit 12a are used. You may use four or more
LED markers 12b which corresponded to XY coordinate. However, it is desirable to use three,
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because the number of LED markers 12b can be minimized.
[0049]
Further, in the first embodiment or the second embodiment, although the main microphone 12 is
provided with only a single sound receiving unit 12a, the main microphone 12 is provided with a
plurality of plural sound receiving units 12a. "" May be scanned freely. In this case, it is possible
to measure the distribution of the acoustic intensity of the sound source 11 as follows and to
obtain the total acoustic radiation power of the sound source 11. The measurer scans the sound
receiving unit group so as to surround the sound source 11. The sound pressure signal
repeatedly output from the sound receiving group at this time represents not only the sound
pressure P but also the particle velocity v.
[0050]
The computer 16 obtains the distribution of the sound pressure P and the particle velocity v in
the same manner as the distribution of the sound pressure P in the first embodiment. Then, the
distribution of the time integral value of P · v is determined as the distribution of acoustic
intensity. Furthermore, the computer 16 divides the acoustic intensity into areas to obtain the
total acoustic radiation power of the sound source 11. Also, in the first embodiment or the
second embodiment, the sound field measurement using a microphone as the main sensor has
been described, but the present invention is similarly applicable to the measurement of fields
other than the sound field. For example, it is applicable also to measurement of the field of smell
using an odor sensor.
[0051]
Further, in the third embodiment, the sound source searching method has been described, but
the present invention is similarly applicable to a method of searching for a wave source other
than the sound source. For example, it can be applied to a light source search method.
[0052]
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BRIEF DESCRIPTION OF THE DRAWINGS It is a whole block diagram of the sound field
measurement system of 1st Embodiment. FIG. 7 is an exploded view of a transmitter 13 c of the
video camera 13; It is a figure which shows the general | schematic cross section which cut |
disconnected the video camera 13 in the surface containing the optical axis AX, and the
advancing direction of an ultrasonic wave. It is the figure which looked at the main microphone
12 from the position which faces the sound receiving part 12a. It is a circuit block diagram of the
video camera 13 and the main microphone 12 to which the single-around method of 2nd
Embodiment was applied. It is a figure explaining the sound source search method of 3rd
Embodiment. (A) is a conceptual diagram showing a state of conversion of random data P1, P2,
P3,... Into regular data P1 ′, P2 ′, P3 ′,. It is a conceptual diagram which shows the mode of a
phase shift.
Explanation of sign
[0053]
11 sound source 12 main microphone 12a receiver 12b LED marker 12c filter 12d trigger circuit
12e frequency counter 13 video camera 13a camera body 13b lens barrel 13c transmitter 13c-1
piezoelectric vibrator 13c-2 reflector 13c drive circuit 13d light receiver 14 Reference
Microphone 16 Computer 16a Screen AX Optical Axis O Source
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