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JP2007052373

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DESCRIPTION JP2007052373
PROBLEM TO BE SOLVED: To provide an acoustic transmission device capable of determining
and transmitting an arrival direction of sound collected by two sound collection means.
SOLUTION: From the magnitude relationship between the arrival phase difference and / or
arrival level difference of two sound collecting means having directivity capable of collecting
sound signals, and the respective sound collection signals collected by each sound collecting
means, Arrival direction determination means for determining the arrival direction of the
acoustic signal in at least four directions of front, rear, left, and right of the person, and whether
or not a predetermined acoustic signal is included in each of the collected sound signals collected
by each sound collection means When it is determined that the predetermined acoustic signal is
included in at least one of the respective collected sound signals by the filter means and the filter
means, the direction of arrival of the acoustic signal determined by the arrival direction
determination means is presented to a person The directionality of the directionality of each of
the sound collection means is approximately diagonally left rear and approximately diagonal
right rear of the person. [Selected figure] Figure 3
Sound transmission device
[0001]
The present invention relates to a sound transmission device that informs a person of the
direction of arrival of sound and its presence.
[0002]
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For example, a hearing impaired person is a sensory organ other than a hearing (for example, an
eye) because it is difficult to hear or hear sounds in daily life.
You must recognize your own surrounding environment by relying on). In order to eliminate
such inconvenience for the hearing impaired and the like, the microphone is picked up, and
information other than vibration, light and other sounds is generated based on the collected
acoustic signal, and this is sent to the hearing impaired etc. Devices to be presented (sound
transmission devices) have been proposed (see, for example, Non-Patent Documents 1, 2, 3 and
4).
[0003]
All of these devices employ a structure in which a microphone is placed near a sound source to
be notified and a vibration or light is generated when a volume above a threshold is generated. In
addition to these, sound transmission devices have also been developed that register in advance
the sound that you want to be notified, compare the input sound, and recognize the desired
sound that is matched, and present the recognition result by vibration or text. (For example, refer
nonpatent literature 5 and 6).
[0004]
Furthermore, a sound transmission device has also been developed that transmits a vibration
corresponding to a collected sound to a deaf person when it is determined to be the same sound
by comparing the collected sound with a sound registered in advance for recording (for example,
Patent Document 1).
[0005]
These conventional techniques can not detect the arrival direction of the desired sound.
That is, it is not possible to determine the sound coming from any direction and to convey the
arrival direction to the hearing impaired person and the like.
[0006]
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As this solution, in addition to the above-mentioned prior art, three or more channels of
microphones are used as in microphone array technology etc., and the arrival time difference of
the desired sound is extracted by extracting the arrival time difference between the channels.
There is a conceivable method of determining after, left, right, etc. (see, for example, Non-Patent
Document 7). Independent master company's alert master [August 9, 2005 search], Internet
<URL: http://www.jiritsu.com/> System Co., Ltd. assist five [August 9, 2005 search], Internet
<URL: http: //www3.ocn.nejp/~assisthp/> Information of Lion Corporation [searched August 9,
2005], Internet <URL: http://www.rion.co. jp / シ ル Tokyo Nobutomo Sill Watch [August 9, 2005
search], Internet <URL: http://www.shinyu.co.jp/> Tsugemoto Sakae, Ito Kenzo, "Support for the
Deaf" On life sound discrimination methods for the purpose of communication, "Technical Report
on Signal Science, WIT 2002-69, 2002. Shinya Ando, 4 others, “Identification of Warning
Sounds for Hearing Impaired Persons,” Technical Report, EA 2001-119, 2002. Oga Juro,
Yamazaki Yoshio, Kanada Yutaka, "Sound system and digital processing", Corona Co., Ltd., p. 197209 JP-A-11-120468
[0007]
In an acoustic transmission device, emphasis is placed on quick transmission to such an extent
that the direction of arrival of sound is not misunderstood, although it is a simple device, rather
than determining and transmitting the direction of arrival of sound extremely accurately.
Therefore, it is important that the apparatus configuration be as small as possible, and that the
amount of calculation for determining the direction of arrival of sound is not large.
[0008]
However, in the above conventional method of estimating the direction of arrival of sound,
analysis of acoustic signals picked up from three microphones requires the provision of three or
more microphones, which increases the cost and the size of the device. The problem is that a
considerable amount of computation is required.
[0009]
Then, the problem which this invention tends to solve is providing the acoustic transmission
apparatus which can determine and transmit the arrival direction of the sound collected by two
sound collection means in view of the said problem. It is.
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[0010]
In order to solve the above problems, the present invention provides two sound pickup means
having directivity capable of picking up an acoustic signal, and an arrival phase difference and /
or each sound pickup signal picked up by each sound pickup means. Arrival direction
determination means for determining the arrival direction of the sound signal at least about four
directions of front, rear, left, and right based on the magnitude relation of the arrival level
difference, and predetermined sound signals as sound collection signals collected by each sound
collection means Sound signal determined by the arrival direction determination means when it
is determined that the predetermined sound signal is included in at least one of the respective
collected sound signals by the filter means for determining whether or not Sound transmitting
device characterized in that the directionality of the directivity of each of the sound collecting
means is approximately diagonally left rear and approximately diagonally right rear of the
person. .
With such a configuration, it becomes a small-scale acoustic transmission device, and the cost
can be reduced.
[0011]
The sound transmission device according to the present invention comprises sound source
separation means for separating each sound collection signal collected by each of the above
sound collection means into sound signals from the direction of directivity of each of the above
sound collection means and outputting the sound signal. The filter means may be configured to
determine whether each of the sound signals output by the sound source separation means
includes a predetermined sound signal.
With such a configuration, it is possible to improve the determination accuracy as to whether or
not a predetermined acoustic signal is included in the filter means.
[0012]
In the sound transmission device according to the present invention, the respective sound
collecting means and the presenting means are mounted on different parts of a person, and the
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relative directionality of the directivity of each sound collecting means and the front, rear, left,
and right directions in the presenting means Sound detection means for detecting an angle
difference, and the arrival direction determination means is an audio determined from the
magnitude relation of the arrival phase difference and / or arrival level difference of the
respective collected signals picked up by the respective sound collecting means The direction of
arrival of the sound signal may be determined by correcting the direction of arrival of the signal
according to the angle difference detected by the angle detection means. By adopting such a
configuration, it is possible to reduce the erroneous determination of the direction of arrival of
the acoustic signal accompanying the movement of the human body.
[0013]
Further, in the sound transmission device of the present invention, the presentation means
comprises at least two excitation devices, and the presentation means is provided to the person
so that each excitation device is positioned on the left body side and the right body side of the
person. The vibration intensity of each vibration applying apparatus may be different depending
on whether the arrival direction is determined to be approximately forward or approximately
after by the arrival direction determination unit. With such a configuration, the acoustic
transmission device can be further reduced in size and cost.
[0014]
Furthermore, in the sound transmission device according to the present invention, the vibration
intensity of each of the excitation devices is stronger when it is determined to be approximately
after that when the arrival direction determination means determines that the arrival direction is
approximately forward. It may be a thing. With such a configuration, it is possible to strongly
draw human attention to the acoustic signal from behind.
[0015]
According to the present invention, since two sound collecting means are provided and the
direction of arrival of the acoustic signal is presented by at least about four directions of front,
rear, left, and right, the acoustic transmission device can be provided with less equipment and
cost compared to the prior art. realizable.
[0016]
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Further, according to the present invention, the following effects can also be obtained.
That is, since two sound collecting means are provided, the weight of the entire acoustic
transmission device can be reduced, and the device volume can be reduced. Furthermore, the
amount of calculation for analysis of the sound signal collected from the two sound collection
means is the amount of calculation for analysis of the sound signal collected from three or more
sound collection means as in the prior art. Therefore, the operation can be performed by a small
and lightweight arithmetic processing unit. In addition, since such a small and lightweight
arithmetic processing device consumes less power, the power supply device (for example,
battery) of the acoustic transmission device can be small and light, and the power supply device
in the prior art can be used. In the case of using a power supply device of the same size as the
above, the sound transmission device can be operated for a long time.
[0017]
Hereinafter, embodiments of the present invention will be described with reference to FIGS. 1 to
11, but corresponding parts in the respective drawings are denoted by the same reference
numerals and redundant description will be omitted. In the present embodiment, the sound
transmission device (A) according to the present invention is attached to a person as an example
(see FIG. 3 and FIG. 4), and by using two microphones, the direction of arrival of sound is 4 It is
possible to divide and divide into directions and transmit.
[0018]
As illustrated in FIGS. 1 and 2, the sound transmission device (A) according to the present
embodiment includes a sound collection output unit (a), a general control unit (b), and a
presentation unit (c).
[0019]
The hardware configuration of the control unit (b) will be described.
The general control unit (b) is an input unit (100) to which a microphone or a gyro sensor of a
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sound collection output unit (a) described later can be connected, and an output unit (101) to
which an excitation device of a presentation unit (c) described later can be connected. , DSP
(Digital Signal Processor) (102) [a cache memory and the like may be provided. Memory (RAM)
(Random Access Memory) (103), ROM (Read Only Memory) (104), and their input unit (100),
output unit (101), DSP (102), RAM (103), ROM (104) A transmission path (105) and the like are
connected so as to enable exchange of data between them. Instead of the DSP (102), a CPU
(Central Processing Unit) may be used.
[0020]
The ROM (104) of the general control unit (b) stores and stores a program for enabling sound
transmission and data required for processing the program. Further, data and the like obtained
by the processing of these programs are appropriately stored and stored in the RAM (103) or the
like.
[0021]
More specifically, the ROM (104) has a program for converting a collected sound signal picked
up by a microphone into a discrete signal (in the time domain), and is for cutting out a frame
with an appropriate length from the discrete signal. Program, program for converting time
domain frame to frequency domain signal (discrete Fourier transform), program for calculating
arrival phase difference / arrival level difference from signals collected by a plurality of
microphones, microphone pointing region A program for selecting frequency components of an
acoustic signal from a sound source present in the computer, a program for converting a
frequency domain signal into a time domain signal (inverse discrete Fourier transformation), an
acoustic signal from a sound source present in a directional region of a microphone Program for
determining whether or not the target contains an acoustic signal, target phase difference /
target level Programs for determining the direction of arrival of sound, a program for controlling
the driving of the vibrating device of the presentation unit (c) is stored stored from. In addition,
control programs for controlling processing based on these programs are also stored
appropriately.
[0022]
In the general control unit (b) of the sound transmission device (A) according to the present
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embodiment, each program stored in the ROM (104) and data necessary for the processing of
each program are read into the RAM (103) as necessary. Are interpreted and executed by the
DSP (102). As a result, the DSP (102) has predetermined functions (A / D conversion unit, frame
extraction unit, frequency analysis unit, arrival phase difference / arrival level difference
calculation unit, selection unit, signal combining unit, filter unit, arrival direction determination
Unit, drive control unit).
[0023]
The sound collection output unit (a) and the general control unit (b), the presentation unit (c) and
the general control unit (b) are respectively connected via the electric wire (60). More
specifically, the input unit (100) of the general control unit (b) and the microphones of the sound
collection output unit (a) described later are connected via the electric wire (60), and the output
unit of the general control unit (b) (101) and each excitation apparatus of the presentation part
(c) mentioned later are connected via an electric wire (60).
[0024]
The sound pickup output unit (a) of the sound transmission device (A) includes a directional twochannel microphone (12L) and a microphone (12R) for picking up ambient sound, and can be
worn on the head of a person It is a structure. Specifically, the sound pickup output section (a)
has microphones (12L) and (12R) attached to predetermined positions of a belt (11) which can
be wound around the head, for example. . Of course, the present invention is not limited to the
belt (11). For example, the microphones (12L) (12R) may be attached to a hat. In other words,
any microphone can be used as long as the microphones (12L) and (12R) can be held near the
head.
[0025]
Although there is no absolute limitation on the type of directivity of each of the microphones
(12L) and (12R), generally, omnidirectional (nondirectional) microphones are used in view of
determining the direction of arrival of sound. Is not preferred. In the present embodiment, single
directivity (narrow directivity, sharp directivity) is included. In the example of FIG. 5, a
unidirectional microphone is used.
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[0026]
The position where the microphones (12L) and (12R) are attached to the belt (11) is the direction
of the microphones (12L) and (12R) when the sound pickup output unit (a) is attached to the
head of a person (each microphone The directionality of the direction of the person) is the front
and back direction of the person (with the face front and the back of the head behind. It is
preferable to position them so as to be approximately symmetrical with respect to each other
(see angles α and β in FIG. 5). Note that, although directivity generally has main lobes and side
lobes, these are omitted in FIG. 5 and are schematically illustrated. ). In addition, the
directionality (approximately in the vertical plane) of the directivity of each of the microphones
(12L) and (12R) is approximately about when the person looks straight at the front with the
sound collection output unit (a) mounted on the head. It is good to be horizontal. However, since
the head also moves along with human behavior, there is no particular limitation in attaching
each microphone so as to be approximately horizontal, and the directivity of each microphone
(12L) (12R) is directed to the ground It is supposed to be approximately horizontal, assuming
that it is not common to aim at the sky or to the sky. In addition, the directionality
(approximately in the horizontal plane) of the directivity of each of the microphones (12L) and
(12R) is oblique when a person looks straight at the front with the sound pickup output unit (a)
mounted on the head. It is good to be left backward and diagonally right backward.
[0027]
On the other hand, the directionality (approximately in the horizontal plane) of the directivity of
each of the microphones (12L) and (12R) may be arranged so as to be diagonally left front and
diagonally right front. In the present embodiment, the sound information is, for example, warning
notification sound and the like on the rear left and right which are hard to enter the field of view.
In view of the fact that in many cases it is important to rapidly transmit), in order to further
improve the detection accuracy of the rear sound, the diagonal left rear and the diagonal right
rear are arranged. Of course, the directionality (approximately in the horizontal plane or in the
vertical plane) of the directivity of each of the microphones (12L) and (12R) may be
appropriately changed in accordance with the use situation of the acoustic transmission device
(A), etc. .
[0028]
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The sound collection output unit (a) outputs the surrounding sound collected by each of the
microphones 12 L and 12 R as a sound collection signal L and a sound collection signal R (step S
1). These collected sound signals are input to the A / D conversion unit (2) in the general control
unit (b).
[0029]
The general control unit (b) of the sound transmission device (A) is directed to each of the
microphones (12L) and (12R) from the sound collection signal L and the sound collection signal
R output from the sound collection output unit (a). Region (hereinafter referred to as "pointing
region". The sound signal of the sound source present in FIG. 5) is separated and extracted (step
S2).
[0030]
As means for separating and extracting an acoustic signal from a sound source present in such a
directional area, a description will be added taking a zone separation and sound collection
technique (patent 3355598) owned by the applicant as an example. Of course, such means is not
intended to be limited to the zone separation sound collecting technique, and the means is not
limited as long as an acoustic signal from a sound source present in the directional region can be
separated and extracted.
[0031]
Hereinafter, an outline of the zone separation sound collection technology in the present
embodiment will be described with reference to FIG. 6, FIG. 7, FIG. 8, and FIG. See reference 1 for
details of the zone separation sound collection technology. (Reference 1) Patent No. 3355598
[0032]
The A / D conversion unit (2) in the general control unit (b) samples each of the sound collection
signal L and the sound collection signal R output from the sound collection output unit (a) at a
sampling rate of 11,025 Hz, for example The signal is appropriately quantized and converted
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into a discrete signal L and a discrete signal R. In addition, since the A / D conversion from the
collected signal to the discrete signal is achieved in the same manner as in the known art, the
detailed description will be omitted. The A / D converter (2) outputs these discrete signals. These
discrete signals are input to the frame cutout unit (3) in the general control unit (b).
[0033]
The frame cutout unit (3) cuts out discrete signals of a predetermined time length as a frame L
and a frame R from the discrete signal L and the discrete signal R while moving the start point
with a fixed time width in the time axis direction. For example, an acoustic signal having a length
of 512 sample points is cut out while moving the starting point by 256 sample points. To cut out
each frame, a known window function (for example, a Hamming window, a Gaussian window)
may be applied to the discrete signal. The cutting out of the frame by application of the window
function is achieved in the same manner as in the prior art, and thus the detailed description will
be omitted. The frame cutout unit (3) outputs each of the cut out frames. Each of these frames is
input to the frequency analysis unit (41) in the general control unit (b).
[0034]
The frequency analysis unit (41) performs discrete Fourier transform on each of the frame L and
the frame R, and obtains each discrete spectrum. The frequency analysis unit (41) outputs a
discrete spectrum L and a discrete spectrum R for each of the frame L and the frame R. The
discrete spectrum L and the discrete spectrum R are input to the arrival phase difference / arrival
level difference calculation unit (42) and the selection unit (43).
[0035]
The arrival phase difference / arrival level difference calculation unit (42) in the general control
unit (b) is an arrival level difference and / or for each frequency between the discrete spectrum L
and the discrete spectrum R output by the frequency analysis unit (41). The arrival phase
difference (arrival time difference) is calculated.
[0036]
The selection unit (43) in the general control unit (b) outputs the arrival level difference and / or
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for each frequency between the discrete spectrum L and the discrete spectrum R output by the
arrival phase difference / arrival level difference calculation unit (42) Based on the arrival phase
difference, frequency components for each frequency are selected from the frequency
components of each discrete spectrum.
This selection is made, for example, when it is determined that the arrival phase difference at a
certain frequency corresponds to the arrival phase difference of the acoustic signal from the
sound source present in the directional region of the microphone (12L). Is weighted by a value
close to 1 to 1 as a weight, and the frequency component at that frequency of the discrete
spectrum R is multiplied by a value close to 0 to 0. By such selection, the selection unit (43)
outputs a discrete spectrum La composed of frequency components selected as frequency
components of the acoustic signal from the sound source present in the directional region of the
microphone (12L). The discrete spectrum La is an input of the signal synthesis unit (44L) in the
general control unit (b). Further, the selection unit (43) also outputs a discrete spectrum Ra
composed of frequency components selected as frequency components of an acoustic signal
from a sound source present in the directional region of the microphone (12R). The discrete
spectrum Ra is input to the signal synthesis unit (44R) in the general control unit (b).
[0037]
The signal synthesis unit (44L) performs inverse Fourier transform on the discrete spectrum La
and outputs an acoustic signal L from a sound source present in the directional region of the
microphone (12L). In addition, the signal synthesis unit (44R) performs inverse Fourier
transform on the discrete spectrum Ra, and outputs an acoustic signal R from a sound source
present in the directional region of the microphone (12R). The acoustic signal L and the acoustic
signal R output from the signal synthesis units (44L) and (44R) are input to the filter unit (5) in
the generalization unit (b).
[0038]
The filter unit (5) determines whether or not each of the acoustic signal L and the acoustic signal
R includes a target acoustic signal under predetermined conditions, and outputs this
determination result (step S3). ). The determination result is input to the drive control unit (7) in
the general control unit (b). As the "targeted acoustic signal", for example, an impact sound
generated when an object contacts an object, a sound generated suddenly such as a car horn or
siren, a car no. There are notification sound etc. The “predetermined condition” may be set by
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focusing on the acoustic features of such an acoustic signal. For example, when it is determined
whether the sound signal L or the sound signal R includes a sound generated suddenly, "the
sound pressure level of the sound signal L or the sound signal R is equal to or higher than a
predetermined sound pressure level" It is possible that the sound pressure level of the sound
signal L to the sound signal R has a predetermined difference or more compared with the sound
pressure level of the background noise, or the sound signal L to the sound signal R. In the case of
determining whether or not the notification sound etc. is included, note that the notification
sound etc. contains the characteristic frequency and pattern as standardized in JIS S 0013 of the
Japan Standards Association. It may be set on condition that “the frequency included in L to the
acoustic signal R is concentrated at a predetermined frequency” or the like. Also, by combining
a plurality of conditions, it may be determined whether or not the acoustic signal L to the
acoustic signal R include a target acoustic signal. There are various specific processing methods
of these, one example of which is disclosed in Reference 2. (Reference 2) Japanese Patent LaidOpen No. 2004-240855
[0039]
The selection unit (43) and the signal combining units (44L) and (44R) are components for
separating and extracting acoustic signals from sound sources present in the directional region
(these are collectively referred to as a sound source Described as a separation part (d). Therefore,
when the sound source direction is known in advance, the sound source separation unit (d)
becomes unnecessary, and the sound collection signal L and the sound collection signal R output
from the sound collection output unit (a) It becomes input of). In this case, the filter unit (5)
determines whether each of the collected signal L and the collected signal R includes a target
acoustic signal under predetermined conditions, and determines the result of the determination.
Output.
[0040]
The arrival direction determination unit (6) in the generalization unit (b) determines the arrival
level difference for each frequency between the discrete spectrum L and the discrete spectrum R,
which is output by the arrival phase difference / arrival level difference calculation unit (42)
Based on the arrival phase difference, the arrival direction of the target acoustic signal is divided
into four directions and determined, and the determination result is output (step S4). An example
of a method of determining in four directions will be described below. First, it is determined that
one of the discrete spectra is larger in the arrival level difference for each frequency between the
discrete spectrum L and the discrete spectrum R output by the arrival phase difference / arrival
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level difference calculation unit (42). Rate (hereinafter referred to as “band rate”. Is
determined over the entire frequency band, and the band ratio is set to a predetermined
threshold value μ (eg, μ = 0.7). It is determined whether or not it exceeds (step S41). Next,
when the band ratio determined that the discrete spectrum L is larger exceeds the predetermined
threshold value μ, “left” is set as the arrival direction of the target acoustic signal (step S42).
On the contrary, when the band ratio determined that the discrete spectrum R is larger exceeds
the predetermined threshold value μ, the “right” is set as the arrival direction of the target
acoustic signal (step S43). If the band ratio determined that one of the discrete spectra is larger
does not exceed the predetermined threshold μ, the directional microphone has a high ability to
pick up sound in the directional region and each microphone Focusing on the positional
relationship of (12L) and (12R), the sound pressure level of the sound collection signal collected
by the microphone (12L) or the microphone (12R) is a predetermined threshold value τ (eg, τ =
0.6). Do. If it is larger, "after" is the arrival direction of the target sound (step S44), and if it is
smaller, "front" is the arrival direction of the target sound (step S45). The “predetermined
threshold value τ” is determined in accordance with the characteristics of the microphone and
the use environment. The determination result output by the arrival direction determination unit
(6) is input to the drive control unit (7) in the general control unit (b).
[0041]
In addition, based on the feature that the microphones having directivity have high ability to pick
up sound in the directional region and the positional relationship between the microphones (12L)
and (12R), the modified example of the arrival direction determination method described above
is described below. explain. In this modification, steps S41, S44, S45, and S46 are the same as the
above-described determination method, and thus the description thereof is omitted. In the abovedescribed direction-of-arrival determination method, in step S42, when the ratio of bands in
which the discrete spectrum L is determined to be larger exceeds the predetermined threshold
value μ, the “left” is used as the arrival direction of the target acoustic signal. . In this
modification, when the band ratio determined that the discrete spectrum L is larger exceeds the
predetermined threshold value μ, the sound pressure level γ of the sound collection signal
collected by the microphone (12L) is appropriately normalized. It is assumed that And
predetermined thresholds ξ1 and ξ2 (eg, ξ1 = 0.4, 42 = 0.6). (Step S42a). If the sound
pressure level γ of the collected signal collected by the microphone (12L) is ξ2 <γ, then “left
rear” is set as the arrival direction of the target acoustic signal (step S42b). If the sound
pressure level γ of the sound collection signal collected by the microphone (12L) is γ <ξ1,
then the “right front” is set as the arrival direction of the target sound signal (step S42c). If the
sound pressure level γ of the collected signal collected by the microphone (12L) satisfies ξ1 ≦
γ ≦ ξ2, then the “left” is taken as the arrival direction of the target acoustic signal (step
S42d). Further, in the above-described arrival direction determination method, the arrival
04-05-2019
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direction of the sound signal for which the “right” is the target is determined when the band
ratio determined that the discrete spectrum R is larger exceeds the predetermined threshold μ in
step S43. It was. In this modification, when the band ratio determined that the discrete spectrum
R is larger exceeds the predetermined threshold value μ, the sound pressure level γ of the
sound collection signal collected by the microphone (12R) is appropriately normalized. It is
assumed that And predetermined thresholds ξ1 and ξ2 (eg, ξ1 = 0.4, 42 = 0.6). (Step S43a). If
the sound pressure level γ of the sound collection signal collected by the microphone (12R) is
ξ2 <γ, then “right rear” is set as the arrival direction of the sound signal targeted (step S43
b). If the sound pressure level γ of the collected signal collected by the microphone (12R)
satisfies γ <ξ1, then the “right front” is set as the arrival direction of the target acoustic
signal (step S43c).
If the sound pressure level γ of the sound collection signal collected by the microphone (12R)
satisfies ξ1 ≦ γ ≦ ξ2, then the “right” is taken as the arrival direction of the target sound
signal (step S43d).
[0042]
In the determination method of the arrival direction as described above, for example, an
erroneous determination in the front-rear direction occurs when a large (predetermined) sound is
generated in front of a person or a small (predetermined) sound is generated behind a person.
Sometimes. However, since the determination of the arrival direction by the arrival direction
determination unit (6) is a determination of the arrival direction for a frame having a relatively
short time width cut out by the frame cut out unit (3), some erroneous determinations In the case
of an acoustic transmission device, it is more important to transmit the presence and the
direction of arrival of the target acoustic signal to a person faster than in the case of accurate
determination of the direction of arrival. Since recognition of the surrounding situation is usually
performed by a sensor other than the auditory sense, even if there are some misjudgments, it
does not pose a major problem.
[0043]
Before describing the operation of the drive control unit (7), the presentation unit (c) of the
sound transmission device (A) will be described. The presentation unit (c) of the sound
transmission device (A) includes four vibration devices and is configured to be attachable to the
waist of a person. Specifically, the presentation unit (c) mounts each of the excitation devices
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(72L) (72R) (72F) (72B) at a predetermined position of the belt (71) that can be wound around
the waist, for example. It has become a thing. Of course, the present invention is not limited to
the belt (71) but may be any one capable of holding the respective excitation devices (72L) (72R)
(72F) (72B) in the vicinity of the waist.
[0044]
The position at which each vibration exciter (72L), (72R), (72F) and (72B) is attached to the belt
(71) is that when the presentation unit (c) is attached to the waist, each vibration exciter (72L)
(72R) (72R) 72F) (72B) is preferably positioned in front of, behind, to the left, and to the right of
a person. In other words, the excitation device (72F) at the waist (front) of the person, the
excitation device (72B) at the waist (rear) of the person, the excitation device (72L) at the waist
(left) of the person, A vibration exciter (72R) is provided on the (right) side.
[0045]
The drive control unit (7) controls the drive of the excitation device of the presentation unit (c)
by using the determination result output by the filter unit (5) and the determination result output
by the arrival direction determination unit (6) as input. (Step S5). Specifically, the drive control
unit (7) first determines the determination result output by the filter unit (5). If the determination
result is not "the target acoustic signal is included", the drive of the excitation device of the
presentation unit (c) is not performed. On the other hand, when the determination result is that
"the target acoustic signal is included", the appropriate excitation device is driven based on the
determination result output by the arrival direction determination unit (6). . For example, in the
case where the determination result output by the arrival direction determination unit 6 is
“right”, the vibration device (72R) provided on the waist (right) is driven to vibrate. This
vibration is transmitted to the person, who perceives the vibration and thus the presence of the
intended sound and its direction of arrival (in this case, right). ) Can be recognized.
[0046]
Further, in the case of the determination method as described in the modification of the arrival
direction determination method described above, for example, when the determination result
output by the arrival direction determination unit (6) is “right rear” The excitation apparatus
(72R) provided in the right) and the excitation apparatus (72B) provided in the lower back (rear
part) may be driven together and vibrated.
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[0047]
Note that the drive control unit (7) vibrates the acoustic signal as it is a vibration, as the filter
unit (5) outputs not only the determination result but also the acoustic signal output from the
signal combining unit (44L) (44R). May be converted to a perceivable frequency, and the vibrator
of the presentation unit (c) may be driven to vibrate at this frequency.
[0048]
Also, the number of vibration devices in the presentation unit (c) may be two.
An example of a method of distinguishing four directions by two vibration exciters is as follows.
Here, it is assumed that two excitation devices (72R) (72L) are provided at the lumbar (right) and
the lumbar (left). For example, when the direction of arrival is left or right, the excitation device
(72L) provided on the waist (left) or the excitation device (72R) provided on the waist (right) is
driven to vibrate. When the direction of arrival is forward or backward, the left and right exciters
(72L, 72R) are driven together, and when the direction of arrival is forward, weak vibration, and
when the direction of arrival is later, strong vibration and Do. Conversely, if the direction of
arrival is earlier, strong vibration may be considered, and if the direction of arrival is later, weak
vibration may be considered, but the sound from the front that can be visually judged to some
extent for the hearing impaired person etc. Since sound information from the rear and left and
right sides where visual judgment is relatively difficult is more important than that, it is
preferable to set strong vibration when the direction of arrival is a later sound.
[0049]
The presentation method of the presentation unit (c) is not limited to the presentation method of
vibration as long as it is possible to present the presence of the sound and its arrival direction to
a person. For example, it may be a method of visually displaying the presence of the sound and
its arrival direction on a portable display instead of the above-described vibration excitation
apparatus, and as one example, the arrival direction of the sound centering on the position of a
person Is displayed by arrows or letters.
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[0050]
In the present embodiment, as shown in FIGS. 3 and 4, the sound collection output unit (a) is
attached to the head, and the presentation unit (c) is attached to the waist. In this case, for
example, when looking back in response to a sound from behind (that is, the vibration of the
vibration device (72B)), the head may rotate horizontally with the position of the waist being
approximately unchanged. As a result, there is a possibility that the arrival direction of the sound
picked up by the sound collection output unit (a) may not be accurately grasped because it does
not match. As a method of coping with such a possibility, the sound collection output unit (a) and
the presentation unit (c) may be used instead of mounting the sound collection output unit (a)
and the presentation unit (c) on different parts. And there is a method of attaching to the same
part. That is, for example, each microphone (12L) (12R) may be provided on the belt (71).
Alternatively, a sensor capable of detecting a position or an angle, for example, a gyro sensor, in
the case where the sound collection output unit (a) and the presentation unit (c) are mounted on
different parts as described in the above embodiment (80) is provided in the sound collection
output unit (a) (there is no limitation on the mounting position of the gyro sensor (80) in the
sound collection output unit (a)), and the gyro sensor (80) To output this (see FIG. 2, FIG. 4, FIG.
8, and FIG. 9). The rotation angle θ output by the gyro sensor (80) is input to the arrival
direction determination unit (6). Then, the arrival direction determination unit (6) rotates the
arrival direction determination reference in the same direction (angle θ) by the rotation angle θ
output by the gyro sensor (80), and determines the arrival direction based on this reference You
may do so. By doing this, for example, when the head is turned horizontally 90 degrees to the
right, the intended sound is temporarily behind the head (that is, to the left of the waist. Even if
the problem occurs, the arrival direction determination unit (6) determines that the arrival
direction is "left", and the presentation unit (c) drives the left vibration device (72L).
[0051]
The present invention is capable of transmitting the presence of sound and the direction of its
arrival to the human being, so that the hearing is limited like a person who works with a hearing
impaired person or wearing a helmet that covers both ears. It is useful for the substitution and
assistance of the hearing of
[0052]
The hardware structural example of an acoustic transmission apparatus (A).
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The hardware structural example of the sound transmission apparatus (A) provided with the gyro
sensor (80). The figure which showed the example which mounted | worn the sound
transmission apparatus (A) on the person. The figure which showed the example which equipped
the person with the sound transmission apparatus (A) provided with the gyro sensor (80) to a
person. The figure which illustrated the directivity of each directional microphone (12L) (12R).
FIG. 2 is a functional block diagram of an acoustic transmission device (A). The functional block
diagram of the sound transmission apparatus (A) which is not provided with a sound source
separation part (d). The functional block diagram of the sound transmission apparatus (A)
provided with the gyro sensor (80). The functional block diagram of the sound transmission
apparatus (A) which is equipped with the gyro sensor (80) but without the sound source
separation part (d). The figure which shows the processing flow in a sound transmission
apparatus (A). The figure which shows the processing flow of arrival direction determination in
arrival direction determination part (6). The figure which shows the modification of the
processing flow of arrival direction determination in an arrival direction determination part (6)
(the 1). The figure which shows the modification of the processing flow of arrival direction
determination in an arrival direction determination part (6) (the 2). The figure which shows the
modification of the processing flow of arrival direction determination in the arrival direction
determination part (6) (the 3).
Explanation of sign
[0053]
A sound transmission device a sound collection output unit b generalization unit c presentation
unit d source separation unit 12 L directional microphone 12 R directional microphone 2 A / D
conversion unit 3 frame cutout unit 41 frequency analysis unit 42 arrival phase difference /
arrival level difference Calculation unit 43 Selection unit 44L Signal synthesis unit 44R Signal
synthesis unit 5 Filter unit 6 Arrival direction determination unit 7 Drive control unit 72F
Vibration device 72B Vibration device 72L Vibration device 72R Vibration device 80 Gyro sensor
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