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JP2010226244

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Notice
This translation is machine-generated. It cannot be guaranteed that it is intelligible, accurate,
complete, reliable or fit for specific purposes. Critical decisions, such as commercially relevant or
financial decisions, should not be based on machine-translation output.
DESCRIPTION JP2010226244
An object of the present invention is to provide a sound emission and collection device that can
be easily switched when switching directivity at the time of sound emission. SOLUTION: A
loudspeaker 1 according to an embodiment of the present invention is a wide directivity mode in
which a loud voice is emitted when the user's voice collected is large, and a narrow directivity
mode in which a loud voice is emitted when the voice is small. As, sound spread angle can be
changed. Therefore, if the user makes a small voice such as a whisper and directs the direction of
the loudspeaker 1 to a specific person while conveying the contents of the utterance to a wide
range of people, the user does not have to perform any other operation. The utterance content
can be conveyed to a specific person within a narrow range reached by the sound. [Selected
figure] Figure 2
Sound emission device
[0001]
The present invention relates to a technique for controlling directivity when emitting a collected
sound.
[0002]
In loudspeakers, there is a technology that emits noise with a very narrow directivity when it is
desired to announce in a specific area, while it emits noise with a wide directivity when it is
desired to announce in a wide area ( For example, Patent Document 1).
[0003]
09-05-2019
1
Unexamined-Japanese-Patent No. 2007-267368
[0004]
Although the directivity at the time of sound emission can be switched by using such a technique,
an operation for switching is required at the time of switching, which is complicated.
[0005]
The present invention has been made in view of the above-described circumstances, and it is an
object of the present invention to provide a sound emission and collection device that can be
easily switched when switching directivity at the time of sound emission.
[0006]
In order to solve the above-mentioned problems, the present invention picks up sound in the
vicinity and generates an audio signal indicating the contents of the picked up sound, and gives
directivity to the sound relating to the audio signal for release. A sound emitting means for
producing sound, an extracting means for analyzing an audio signal generated by the sound
collecting means, and extracting a feature amount indicating a specific feature of the audio
signal, and a feature amount extracted by the extracting means Accordingly, the sound emission
control means is controlled to control directivity provided by the sound emission means, and to
change directivity angle of sound emitted by the sound emission means. Provide an apparatus.
[0007]
In another preferred embodiment, the directivity control means changes the sound spread angle
in two steps depending on whether the feature quantity extracted by the extraction means
satisfies a specific condition. Do.
[0008]
Further, in another preferable aspect, when changing the spread angle of the sound by the
control by the directivity control means, the sound control system further comprises direction
indication means for visually indicating the sound emission direction of the sound. Do.
[0009]
According to the present invention, it is possible to provide a sound emission and collection
device that can be easily switched when switching the directivity at the time of sound emission.
09-05-2019
2
[0010]
It is a figure explaining the control aspect of the appearance and directivity of a loudspeaker
concerning an embodiment of the present invention.
It is a block diagram showing composition of a loudspeaker concerning an embodiment of the
present invention.
It is a figure which shows an example of a change of the feature-value information output from
the sound collection part which concerns on embodiment of this invention.
It is a figure explaining the external appearance of the loudspeaker concerning the modification
9. FIG.
[0011]
Hereinafter, an embodiment of the present invention will be described.
[0012]
<Embodiment> FIG. 1: is explanatory drawing which shows the control aspect of the external
appearance of the loudspeaker 1 which concerns on this embodiment, and the directivity of
sound emission.
First, the outline of the configuration of the loudspeaker 1 will be described with reference to
FIG.
In the loudspeaker 1, a microphone unit 111 is provided at one end of a cylindrical casing 100,
and a speaker array unit 121 and a light emitting element 161 are provided at the other end.
In addition, the housing 100 is provided with a support portion 200 which is a handle for
09-05-2019
3
supporting the loudspeaker 1 with the hand of the user.
Note that the support unit 200 may be provided with an operation unit such as an operation
button for controlling the power supply of the loudspeaker 1.
[0013]
When the user's voice is collected by the microphone unit 111 of the loudspeaker 1, the user's
voice is emitted from the speaker array unit 121.
In this example, the emitted sound has directivity, and a wide directivity mode in which the
sound is emitted in a wide range (the range between the solid lines W1 and W2 in FIG. 1) by the
processing described below. The spread angle of sound is controlled so as to be any of the
narrow directivity modes in which sound is emitted in a narrow range (range between broken
lines T1 and T2 in FIG. 1).
Note that, in FIG. 1, the spread angle of sound is described as a figure from the side direction of
the loudspeaker 1, but the same control of the spread angle of sound is performed even when
viewed from the top.
[0014]
Further, in the case where the narrow directivity mode is emitted, the laser light is emitted from
the light emitting element 161, and the irradiation direction is the same as the direction of the
emitted sound.
That is, the direction of the sound emitted in the narrow directivity mode can be visually
indicated to the user by pointing visually by irradiating the laser light. The detailed configuration
of the loudspeaker 1 will be described below with reference to FIG.
[0015]
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4
FIG. 2 is a block diagram showing the configuration of a loudspeaker 1 which is a sound emission
and collection device according to an embodiment of the present invention. The loudspeaker 1
includes a sound collection unit 11, a sound emission unit 12, an extraction unit 13, a storage
unit 14, a directivity control unit 15, and a light emission unit 16.
[0016]
The sound collection unit 11 includes a microphone unit 111 that collects surrounding sounds,
and outputs an audio signal indicating the collected sound.
[0017]
The sound emitting unit 12 has a speaker array unit 121 in which a plurality of speakers are
arranged along the circumferences of concentric circles having a plurality of different diameters.
The speaker array unit 121 may have a plurality of speakers, and is not limited to the above
arrangement as long as the directivity can be controlled.
[0018]
The sound emitting unit 12 acquires the audio signal output from the sound collecting unit 11,
and performs acoustic processing such as directivity imparting processing such as delay
processing and level adjustment processing and amplification processing on this audio signal,
The signal is output to each of the plurality of speakers of the speaker array unit 121. As a result,
the sound related to the audio signal output from the sound collection unit 11 is emitted as a
sound to which directivity is added.
[0019]
The sound output unit 12 is controlled by the directivity control unit 15 to be described later to
either the wide directivity mode or the narrow directivity mode described above, and the spread
angle of the sound to be emitted corresponds to each mode. Perform audio processing on the
audio signal. In the wide directivity mode, the sound output unit 12 outputs the sound to the
09-05-2019
5
speaker array unit 121 because the decrease in sound pressure at a distance from the speaker
array unit 121 is larger than that in the narrow directivity mode. The amplification process may
be performed to increase the output level of the audio signal.
[0020]
The extraction unit 13 acquires an audio signal output from the sound collection unit 11, and
analyzes the audio signal to extract a feature amount indicating a specific feature of the audio
signal. In this example, the extraction unit 13 extracts the volume level of the audio signal as the
feature amount. The extraction of the volume level may be performed, for example, by detecting
the envelope of the waveform of the audio signal and smoothing through a low pass filter. Then,
feature amount information indicating the extracted feature amount is output.
[0021]
The storage unit 14 is a storage unit such as a ROM (Read Only Memory) or a non-volatile
memory, and stores a control table in which the feature quantities extracted by the extraction
unit 13 are associated with the contents of directivity control. There is. In this example, as shown
in the correspondence relationship, the wide directivity mode is obtained when the feature
quantity is equal to or greater than a specific threshold Lth, and the narrow directivity mode is
obtained when the feature quantity is less than the specific threshold Lth. A control table in
which the feature amount indicating the volume level is associated with the content of directivity
control is stored in the storage unit 14.
[0022]
The directivity control unit 15 acquires the feature amount information output from the
extraction unit 13 and refers to the control table stored in the storage unit 14 to select either the
wide directivity mode or the narrow directivity mode. Control the sound emitting unit 12
according to the selected mode. In addition, the directivity control unit 15 controls the light
emitting unit 16 described later as either the selected wide directivity mode or the narrow
directivity mode.
[0023]
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The light emitting unit 16 includes a light emitting element 161 that emits a laser beam, and
emits light when the directivity control unit 15 controls the narrow directivity mode. The
irradiation direction of the laser light is substantially the same as the direction in which the
sound emitted from the sound emitting unit 12 in the narrow directivity mode is directed, and
the sound arrives by confirming the position where the laser light is irradiated. You can visually
confirm the rough range to do.
[0024]
Note that the irradiation period of the laser light is not limited to the entire period controlled to
the narrow directivity mode, but irradiation or irradiation stop may be periodically repeated
during the entire period, and the laser beam is controlled to the narrow directivity mode It may
be only the first predetermined period. In addition, if the support unit 200 is provided with the
operation unit, the irradiation may be stopped by the operation. Further, the light emitting
element 161 is not limited to one emitting a laser beam, and emits as a beam-like light (for
example, light like a spotlight) optically using an LED (Light Emitting Diode), a light bulb or the
like. It may be That is, it is only required that the sound emission direction is visually indicated
when the sound spread angle is changed due to the narrow directivity mode. The light emitting
unit 16 may not be present as a configuration. The above is the description of the configuration
of the loudspeaker 1. Next, an example of the operation of the loudspeaker 1 will be described
with reference to FIG.
[0025]
FIG. 3 is a diagram illustrating an example of time change of feature amount information output
from the extraction unit 13. The vertical axis in FIG. 3 is the sound volume level indicated by the
feature amount information, and the horizontal axis indicates the progress of time. As shown in
FIG. 3, since the volume level is less than the threshold Lth until time t1, the sound emitting unit
12 is controlled to the narrow directivity mode.
[0026]
Then, at time t1, the volume level indicated by the feature amount information becomes equal to
09-05-2019
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or higher than the threshold Lth, and the sound emitting unit 12 is controlled to the wide
directivity mode. As described above, when the size of the user's voice (the level of the collected
sound) becomes equal to or greater than a specific size, the sound is made to reach a wide range.
Thereafter, at time t2, the sound volume level indicated by the feature amount information
becomes less than the threshold Lth, and the sound emitting unit 12 is controlled to the narrow
directivity mode. In this way, when the loudness (voiced level) of the user's voice is less than a
specific magnitude, the sound is made to reach a narrow range. Then, at time t3 again, the sound
volume level indicated by the feature amount information becomes equal to or higher than the
threshold Lth, and the sound emitting unit 12 is controlled to the wide directivity mode.
[0027]
As described above, the loudspeaker 1 according to the embodiment of the present invention is a
wide directivity mode that emits sound in a wide range when the voice of the user who picks up
the sound is large, and narrow when emitting small. As the directivity mode, the spread angle of
sound can be changed. Therefore, if the user makes the voice of a small voice such as a whisper
and directs the direction of the loudspeaker 1 to a specific person while conveying the contents
of the utterance to a wide range of people, the user does not need to perform any other
operation. The utterance content can be transmitted to a specific person in a narrow range where
the sound reaches.
[0028]
Although the embodiments of the present invention have been described above, the present
invention can be implemented in various aspects as follows.
[0029]
<Modification 1> In the embodiment described above, the extraction unit 13 analyzes the
acquired audio signal and extracts the volume level as a feature amount. However, another
feature amount may be used.
For example, the frequency distribution of the audio signal may be calculated by FFT (Fast
Fourier Transform) processing or the like, and the formant frequency may be extracted as the
feature amount from the result. In this case, the control table stored in the storage unit 14
associates the feature quantity indicating the formant frequency of “whisper voice” with the
09-05-2019
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content of directivity control (in this case, narrow directivity mode) I assume. In this control
table, the feature amount indicating the formant frequency of “normal voice” may be further
associated with the content of directivity control (wide directivity mode).
[0030]
Then, the directivity control unit 15 compares the feature quantity indicating the formant of
“whisper voice” in the control table with the formant indicated by the feature quantity
information output from the extraction unit 13, and the sound related to the audio signal
becomes “whisper voice”. Determine if applicable.
[0031]
Then, the directivity control unit 15 controls the sound emission unit 12 as the narrow directivity
mode when it determines that it is a "whisper voice", and controls the sound emission unit 12 as
a wide directivity mode when it determines that it is not a "whisper voice". do it.
[0032]
Here, since the formant frequency differs depending on each vowel, a control table
corresponding to each vowel may be stored.
Then, as to which vowel the control table to be compared with the feature amount information
uses, a plurality of formants such as the first, second, and third formant frequencies indicated by
the control table and the feature amount information The identification may be made possible by
comparing the frequencies.
In this case, the directivity control unit 15 may identify which vowel corresponds to the formant
frequency indicated by the feature amount information, and may refer to the control table
corresponding to the vowel.
[0033]
In addition, since formants may differ depending on the voice quality of the user, even if
formants of “whisper voice” and “normal voice” are acquired from the user's pronunciation,
09-05-2019
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the control table associated with each user is used. Good. When a control table corresponding to
a plurality of users exists, the user who is currently speaking from the feature amount
information is identified with reference to the control table corresponding to each user. May be
[0034]
In addition, “Whistling voice” is the frequency at which the first formant frequency of
“normal voice” becomes high, and only formants of “normal voice” are acquired, and
“whispering voice” or “whistling voice” is determined from the relative change of the first
formant. It may be determined whether it is a normal voice. The formant of "whispering voice" is
described in detail in reference 1 below. (Reference 1: "Formant structure of whisper vowels"
Journal of the Acoustical Society of Japan 56, 7 (2000), pp. 477-487)
[0035]
In this way, the user can switch between the wide directivity mode and the narrow directivity
mode by selectively using the “normal voice” and the “whisper voice”.
[0036]
Further, as another aspect, the extraction unit 13 calculates the frequency distribution of the
audio signal by FFT processing or the like, performs speech recognition processing from the
result, and recognizes the word spoken by the user and recognizes the word You may extract as a
feature-value.
In this case, the control table stored in the storage unit 14 indicates the feature amount
indicating a specific word (for example, “Mr.”, “Say”, etc.) for the narrow directivity mode
and the wide directivity mode. It shall correspond.
[0037]
When the directivity control unit 15 determines that the word indicated by the feature amount
information output from the extraction unit 13 corresponds to the specific word associated with
the narrow directivity mode in the control table, the sound emission unit 12 Control as a narrow
09-05-2019
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directivity mode. On the other hand, when it is determined that the specific words associated
with the wide directivity mode correspond to each other in the control table, the sound emitting
unit 12 is controlled as the wide directivity mode.
[0038]
When the wide directivity mode is defined as the normal mode, the directivity control unit 15
recognizes the volume level of the audio signal output from the sound collection unit 11, and the
sound emission unit 12 The sound emitting unit 12 may be controlled to be in the wide
directivity mode if a state in which it can be considered as silence for a certain period of time (a
state where the volume level is below a threshold) continues while being controlled to the narrow
directivity mode. .
[0039]
In this way, the user can switch between the wide directivity mode and the narrow directivity
mode by uttering a specific word.
[0040]
As described above, the extraction unit 13 can set the feature amount extracted from the
acquired audio signal as the feature amount indicating various features, and the directivity
control unit 15 responds to the feature amount extracted by the extraction unit 13. The sound
emitting unit 12 may be controlled by selecting either the wide directivity mode or the narrow
directivity mode.
As for the feature amount, not only a single type of feature amount but also a combination of a
plurality of types of feature amounts as described above may be used to switch between the wide
directivity mode and the narrow directivity mode. It may be stored in the storage unit 14 as a
control table as to whether to switch based on such criteria.
[0041]
<Modification 2> In the embodiment described above, the directivity control unit 15 controls the
sound emitting unit 12 in two steps by selecting either the wide directivity mode or the narrow
directivity mode. However, the spread angle may be changed more finely to control in multiple
09-05-2019
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steps.
In this case, the control table may be divided into a range of volume levels by a plurality of
threshold values, and each range may be associated with the content of directivity control (in this
case, the spread angle of sound). In addition, the storage unit 14 stores not a control table but a
relational expression between the sound volume level and the spread angle, and the directivity
control unit 15 calculates the characteristic level from the sound volume level which is the
feature amount using this relational expression. The sound emitting unit 12 may be controlled by
the spread angle of the sound. In this way, the spread angle of the sound emitted from the sound
emitting unit 12 can be controlled more finely.
[0042]
<Modification 3> In the embodiment described above, the control table may have hysteresis. For
example, the threshold Lth1 is set by making the threshold Lth1 for switching from the wide
directivity mode to the narrow directivity mode different from the threshold Lth2 for switching
from the narrow directivity mode to the wide directivity mode. It may be made lower than the
threshold value Lth2. In this way, frequent switching between the wide directivity mode and the
narrow directivity mode can be prevented.
[0043]
<Modification 4> In the embodiment described above, the speaker array unit 121 having a
plurality of speakers is used to impart directivity to the sound emitted by the sound emitting unit
12, but another configuration may be used. You may make it have sex. For example, a plurality of
horn speakers capable of emitting directional sound may be provided, and directions of the
sound may be different. Then, in the wide directivity mode, sound may be emitted from all the
horn speakers, and in the narrow directivity mode, sound may be emitted from one horn speaker.
[0044]
Also, the directivity may be controlled by a mechanical configuration. For example, with regard to
a plurality of horn speakers as described above, the direction of the horn speaker can be
09-05-2019
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controlled so that the direction of sound emission can be changed, and in the narrow directivity
mode, the sound emission direction of the horn speaker is made uniform. May be
[0045]
Further, as another aspect, an ultrasonic speaker as described in Patent Document 1 (Japanese
Patent Application Laid-Open No. 2007-267368) described in the prior art is used to emit sound
as directivity sound. It is also good. As described above, the configuration of emitting sound as
directivity can be made into various configurations.
[0046]
<Modification 5> In the embodiment described above, the user visually indicates the direction of
the sound emitted in the narrow directivity mode by the irradiation of the laser light by the light
emitting element 161 of the light emitting unit 16. Although it was made to confirm, as long as it
shows visually, it may be by another structure. For example, a photographing means such as a
CCD (Charge Coupled Device) camera for photographing the direction of the emitted sound may
be provided, and a display means for displaying the photographed image may be provided. Also
in this case, when the mode is changed to the narrow directivity mode, it is possible to visually
indicate to the user the direction of the sound to be emitted.
[0047]
Further, in this case, the imaging range of the imaging means may be changed by zoom
processing or the like. Thus, when the sound emitting unit 12 is controlled to the wide directivity
mode, the photographing means shoots a wide range corresponding to the wide range to be
emitted, and the sound emitting unit 12 is controlled to the narrow directivity mode. When the
camera is in motion, the photographing means can perform zoom processing to photograph a
narrow area corresponding to the narrow area to be emitted. In this way, the user can easily
confirm the direction in which the sound is emitted in the narrow directivity mode, and can also
confirm the change in the spread angle of the sound.
[0048]
09-05-2019
13
Modified Example 6 In the above-described embodiment, the laser irradiation of the light
emitting element 161 of the light emitting unit 16 is performed in the narrow directivity mode,
but the irradiation may be performed in the wide directivity mode. At this time, by expanding the
range to be emitted, the irradiation mode may be changed so as to visually indicate the range. In
addition, light may be optically diffused to expand the irradiation range. In this way, even when
the narrow directivity mode is changed to the wide directivity mode, the user can easily confirm
the change in the sound spread angle.
[0049]
<Modification 7> In the embodiment described above, the microphone unit 111 of the sound
collection unit 11 and the speaker array unit 121 of the sound emission unit 12 are provided at
both ends of the housing 100, but can be separated. It is good also as composition. Then, signals
may be transmitted and received by wire or wireless between the separated components. In this
way, the microphone unit 111 can be fixed close to the user's mouth (headset, pin microphone,
etc.), and the sound emission from the sound emitting unit 12 without changing the user's voice
direction You can change the direction freely.
[0050]
<Modification 8> In the embodiment described above, the sound emission direction when the
sound output unit 12 is controlled to the narrow directivity mode and the sound emission
direction when the sound emission unit 12 is controlled to the wide directivity mode are spread
angles. In the narrow directivity mode, control may be performed in another direction in the
sound emission direction. In this case, the sound emission direction to be controlled is associated
with the control table, and the directivity control unit 15 also controls the sound emission
direction in the narrow directivity mode for the sound emission unit 12 with reference to this
control table. You should do it. Further, an operation unit may be provided on the housing 100 or
the support unit 200 so that the user can change the sound emission direction by operating the
operation unit.
[0051]
<Modification 9> In the embodiment described above, one microphone unit 111 of the sound
09-05-2019
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collection unit 11 and one speaker array unit 121 of the sound emission unit 12 are provided,
respectively, but a plurality may be provided. In this case, the loudspeaker 1A may be configured
as shown in FIG.
[0052]
FIG. 4 is a view for explaining the appearance of a loudspeaker 1A according to the present
modification. In the loudspeaker 1A, as shown in FIG. 4, a support 200A is provided on the
bottom of a rectangular parallelepiped casing 100A. In addition, the loudspeakers 1A face the
surfaces provided with the microphones 111A-F and 111A-R (and 111A-B and 111A-L: 111A-F
and 111A-R, respectively, on the side surface of the rectangular parallelepiped casing. 4 and
speaker arrays 121A-F, 121A-R (and 121A-B, 121A-L: 121A-F, 121A-R, respectively) are
provided. 4 and the light emitting elements 161A-F, 161A-R (and 161A-B, 161A-L: 161A-F,
161A- respectively). Since R is a surface opposite to the provided surface, it is disposed on a
surface not visible in FIG.
[0053]
In the loudspeaker 1A having such a configuration, an audio signal collected by a microphone
unit (for example, 111A-F) provided on one side is a speaker array unit provided on the opposite
side (in this case) , The sound is emitted from 121A-B). In this way, the user is made to emit
sound in the direction in which the user utters, and even if the support 200A is fixedly connected
to another device or the like, various changes can be made by changing the position where the
user utters. It is possible to emit sound in the direction.
[0054]
Although the case 100A has a rectangular parallelepiped shape in this modification, it may have
a cylindrical shape. In this case, a plurality of speaker arrays 121 may be provided along the side
of the cylinder, and a plurality of microphones 111 may be provided. In this way, the sound
collecting direction and the sound emitting direction can be controlled more finely.
[0055]
<Modification 10> In the embodiment described above, the function of the sound collection unit
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11 excluding the microphone unit 111, the function of the sound collection unit 12 excluding the
speaker array unit 121, the function of the extraction unit 13, and the function of the directivity
control unit 15. The functions of the light emitting unit 16 except the light emitting element 161
are realized on hardware, respectively, but the central processing unit (CPU) reads and executes
the control program from the ROM storing the control program. The respective functions of may
be realized on software.
[0056]
The control program in such a case is provided in the state of being stored in a computer
readable recording medium such as a magnetic recording medium (magnetic tape, magnetic disk,
etc.), an optical recording medium (optical disc, etc.), a magneto-optical recording medium, or a
semiconductor memory. It can.
In addition, it is also possible to provide a communication unit connectable to the network and
download it via the network such as the Internet.
[0057]
DESCRIPTION OF SYMBOLS 1, 1A ... Loudspeaker, 11 ... Sound collection part, 111, 111A-F,
111A-R ... Microphone part, 12 ... Sound emission part, 121, 121A-F, 121A-R ... Speaker array
part, 13 ... Extraction part 14, storage unit 15, directivity control unit 16, light emitting unit 161,
161A-F, 161A-R light emitting element, 100, 100A housing, 200, 200A support unit
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