close

Вход

Забыли?

вход по аккаунту

JP2013162212

код для вставкиСкачать
Patent Translate
Powered by EPO and Google
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 JP2013162212
Abstract: PROBLEM TO BE SOLVED: To provide a technical means for preventing the speech
sound from being heard by another person other than the speaker without disturbing the other
person's voice and one's own voice in the conversation. SOLUTION: In a space where speakers 1a
and 2a talk, speech sounds are collected by a sound collection unit 10a. The speech sound
collected by the sound collection unit 10a is wirelessly transmitted to the sound emission unit
30a installed on the ceiling 40 of the conversation space. The sound emitting unit 30a has a
directional speaker 20a. The directional speaker 20a emits speech sound only in the direction in
which the speakers 1a and 2a exist. As a result, the speakers 1a and 2a can listen to the
conversation well and will not naturally speak loudly. Furthermore, since the speech sound is
emitted only in the direction in which the speakers 1a and 2a exist, it becomes difficult for others
except the speaker to hear the conversation. [Selected figure] Figure 1
Conversational information leak prevention device
[0001]
The present invention relates to a conversation information leak prevention device which does
not leak conversation information which is the content of a conversation to the surroundings
other than a speaker.
[0002]
Patent documents 1 and 2 are documents concerning this kind of technology.
03-05-2019
1
The technique disclosed in Patent Document 1 makes a patient wear headphones, picks up a
doctor's voice with a microphone, and listens to the patient through the headphones at a medical
site. In addition, Patent Document 2 discloses a conversation information leakage prevention
technology using a partition. In the technology disclosed in Patent Document 2, in the
conversation space partitioned by partitions, a masking sound is emitted from the upper end of
the partition to the periphery of the conversation space to prevent leakage of the contents of the
conversation.
[0003]
JP-A-2004-120496 JP-A-6-175666
[0004]
By the way, in the technique disclosed in Patent Document 1, there is a problem that the patient's
ear becomes blocked by the headphones, so that it is difficult for the patient's voice to be heard.
In addition, in this technology, there is a problem that the patient must wear headphones, which
is troublesome for the patient.
[0005]
According to Patent Document 2, leakage of a conversation sound can be prevented to some
extent by the partition and the masking sound, but the prevention effect is not sufficient. As a
result, the speaker in the conversation space speaks in a low voice, making it difficult to hear the
other person's voice.
[0006]
Further, in any of the above Patent Documents 1 and 2, it may happen that some speakers
naturally speak louder than necessary due to the fact that their own voice or the voice of the
other party becomes difficult to hear. This is called the Lombard effect. Conversely, the
conversation may be heard by others due to the Lombard effect. As described above, the
03-05-2019
2
techniques disclosed in Patent Documents 1 and 2 are not sufficient to prevent the leakage of
conversation information.
[0007]
The present invention has been made in view of the above circumstances, and prevents the
speech sound from being heard by another person other than the talker without disturbing the
other person's voice and his / her voice in the conversation. The purpose is to provide a technical
means for
[0008]
The present invention has a sound pickup unit for picking up a speaker's speech sound, and a
directional characteristic for emitting the speech sound picked up by the sound pickup unit only
in the direction in which the speaker is present. There is provided a conversation information
leakage prevention device comprising a sound emitting unit.
[0009]
According to the present invention, the speech sound collected by the sound collection unit is
emitted only by the sound emission unit in the direction in which the speaker is present.
Therefore, it becomes easy for the speaker to listen to the speech sound and does not naturally
speak loudly.
Furthermore, since the speech sound is emitted only in the direction in which the speaker exists,
it is difficult for others to hear the speech sound.
[0010]
It is a figure which shows the structure of the conversation information leak prevention
apparatus which is 1st Embodiment of this invention. It is a block diagram which shows the
structure of the sound collection part in the embodiment. It is a block diagram which shows the
structure of the sound emission part in the embodiment. It is a figure which shows the structure
of the conversation information leak prevention apparatus which is 2nd Embodiment of this
03-05-2019
3
invention. It is a block diagram which shows the structure of the sound collection part in the
conversation information leak prevention apparatus which is 4th Embodiment of this invention.
It is a figure which shows the structure of the conversation information leak prevention
apparatus which is 5th Embodiment of this invention. It is a figure which shows the structure of
the conversation information leak prevention apparatus which is 6th Embodiment of this
invention. It is a figure which shows the structure of the conversation information leak
prevention apparatus which is 7th Embodiment of this invention. It is a figure which shows the
structure of the conversation information leak prevention apparatus which is 8th Embodiment of
this invention.
[0011]
Hereinafter, embodiments of the present invention will be described with reference to the
drawings. First Embodiment FIG. 1 is a diagram showing the configuration of a conversation
information leakage prevention apparatus according to a first embodiment of the present
invention. The speech information leakage prevention device shown in FIG. 1 has a sound
collection unit 10a that collects speech sound, and a sound emission unit 30a that has a
directivity characteristic that emits the collected speech sound only in the direction in which the
speaker is present. And.
[0012]
In the present embodiment, the speakers 1a and 2a face each other across the table to talk. The
sound collection unit 10a is installed on a table in order to collect speech sounds of the speakers
1a and 2a. Although the sound pickup unit 10a does not have to be installed at the center of both
speakers 1a and 2a, it is generally installed between both speakers 1a and 2a in order to make it
easy to collect the speech sound of both speakers 1a and 2a. Be done.
[0013]
FIG. 2 shows a block diagram of the sound collection unit 10a in this embodiment. The sound
collection unit 10a includes a microphone 11a, an amplification circuit 12a, a carrier wave
transmission circuit 14a, a modulation circuit 13a, and an antenna 15a. The microphone 11a is a
nondirectional microphone, picks up conversational sound, converts it into an audio signal, and
outputs it to the amplifier circuit 12a. The amplifier circuit 12a amplifies the input audio signal
03-05-2019
4
to a predetermined power and outputs the amplified signal to the modulation circuit 13a. The
carrier wave transmission circuit 14a outputs the carrier wave to the modulation circuit 13a. The
modulation circuit 13a performs frequency modulation on the input carrier and the voice signal,
and outputs a frequency modulation wave in which the voice signal is carried on the carrier to
the antenna 15a. The antenna 15a radiates the input frequency modulation wave into the air.
[0014]
FIG. 3 shows a block diagram of the sound emitting unit 30a in this embodiment. The sound
output unit 30a includes an antenna 21, a tuning circuit 22, a demodulation circuit 23, an
amplification circuit 24, and a directional speaker 20a. The antenna 21 receives the frequency
modulation wave radiated from the antenna 15a of the sound collection unit 10a. The tuning
circuit 22 tunes in the received frequency modulation wave. The demodulation circuit 23
separates the selected frequency modulation wave into an audio signal and a carrier wave, and
extracts the audio signal. The amplifier circuit 24 amplifies the demodulated audio signal to a
predetermined power and outputs the amplified audio signal to the directional speaker 20a. The
directional speaker 20a converts the amplified voice signal into voice and emits the voice. The
directional speaker 20a has, for example, a characteristic that the emitted sound does not spread
in a direction other than the sound emission direction like a flat speaker. As shown in FIG. 1, in
the sound emitting unit 30a, the directional speakers 20a are positioned above the heads of both
speakers 1a and 2a, and the sound emitting surface of the directional speaker 20a is directed to
both speakers 1a and 2a. , Installed on the ceiling 40 of the conversation space. That is, each
directional speaker 20a of the sound emitting unit 30a emits the conversational sound collected
by the sound collection unit 10a only in the direction in which the speakers 1a and 2a exist. Even
in the conversation space, even when the speakers 1a and 2a are speaking at a slightly different
position (that is, a position different from the position directly below the directional speaker
20a), the speaker 1a through the directional speaker 20a An internal drive mechanism may be
provided to adjust the sound emission direction of the directional speaker 20a so that the speech
sound can be emitted only in the direction in which the speaker 2a and 2a exist. Alternatively,
the directional speaker 20a may be installed on the floor 50 near the feet of the speakers 1a and
2a, and the conversation sound may be emitted from the floor 50 toward the speakers 1a and 2a.
[0015]
When the speakers 1a and 2a facing each other across the table start talking, the sound
collection unit 10a installed on the table collects the conversational sounds emitted by both the
03-05-2019
5
speakers 1a and 2a with the microphone 11a, and generates audio signals. It converts and
transmits to the sound emission part 30a installed in the ceiling 40. FIG. The sound emitting unit
30a installed on the ceiling 40 converts the sound signal received from the sound collecting unit
10a into speech sound and emits the sound. As described above, in the present embodiment,
since the conversational sound is emitted only from the directional speaker 20a of the sound
emitting unit 30a in the direction of the speakers 1a and 2a, this conversational sound can be
used by others around the conversation space. It is difficult to hear. On the other hand, each of
the speakers 1a and 2a talks while listening to the conversational sound emitted from the
directional speaker 20a of the sound emitting unit 30a, and can hear the other party's voice and
his own voice well. For this reason, each speaker 1a and 2a does not utter a loud voice more than
necessary. As described above, according to the present embodiment, in the conversation in the
conversation space, each speaker 1a and 2a can hear the other person's speech and hear the
other person's speech without obstructing the other person's voice and his / her voice. It will be
possible to prevent.
[0016]
In the present embodiment, in radio communication between the sound collection unit 10a and
the sound emission unit 30a, the carrier wave is subjected to frequency modulation based on an
audio signal, but in addition, amplitude modulation, digital modulation, pulse modulation, etc. A
modulation scheme may be adopted. Also, if the place where the sound collecting unit 10a and
the sound emitting unit 30a are installed is a place where a cable can be wired between the
sound collecting unit 10a and the sound emitting unit 30a, the sound collecting unit 10a and the
sound emitting unit 30a may be wire-connected by a cable, and an audio signal may be
transmitted from the sound collection unit 10a to the sound emission unit 30a via the cable.
[0017]
Second Embodiment FIG. 4 is a diagram showing the configuration of a conversation information
leakage prevention apparatus according to a second embodiment of the present invention. In the
present embodiment, a sound emitting unit 30b capable of directivity control is installed on the
ceiling 40, and directivity control of the sound emitting unit 30b is performed to the speakers 1b
and 2b located at arbitrary positions in the conversation space. It is realized to aim at and emit
the speech sound. The sound emitting unit 30b installed on the ceiling 40 includes a plurality of
nondirectional speakers 20b arranged in a matrix, and the plurality of nondirectional speakers
20b constitute a speaker array. In this embodiment, a directivity characteristic of emitting speech
sound only in the direction in which the speakers 1b and 2b exist is realized by this speaker
03-05-2019
6
array. More specifically, the sound output unit 30b controls the phase of the sound emitted from
each nondirectional speaker 20b in addition to the plurality of nondirectional speakers 20b (not
shown in FIG. 4). Have. The phase control unit adjusts the phase of the sound emitted from each
nondirectional speaker 20b by the phase control unit so that the speech sound is focused on the
position where the speakers 1b and 2b are present in the speech space. Even if there are
speakers 1b and 2b, it is possible to emit speech sounds only in the direction in which the
speakers 1b and 2b exist. Also according to the present embodiment, as in the first embodiment,
without preventing the speakers 1a and 2a from listening to each other's voice and their own
voice, it is possible to prevent the other person other than the speaker from listening to the
speech sound It becomes possible.
[0018]
In addition, as a sound emission mode at the time of emitting a speech sound toward each
speaker from the sound emission part 30b installed in the ceiling 40, the speech sound comes
from overhead to each of the speaker 1a and the speaker 2b. In addition to the mode of emitting
sound as it does, the mode of emitting sound so that the speech sound comes from above the
head of the conversation partner may be considered.
[0019]
Third Embodiment Next, a third embodiment of the present invention will be described.
When the area around the conversation space is noisy, not only the speech sound but also the
ambient noise may be collected when collecting the speech sound. If noise is picked up to the
surrounding noise and emitted to each talker as it is, each talker feels more noisy and it becomes
difficult to hear the conversation sound. In order to avoid such a defect, in the present
embodiment, the microphone 11a of the sound collection unit 10a (see FIG. 1) picks up sound
arriving from a specific direction (directed direction) with high sensitivity, and arrives from other
directions. Use a directional microphone that does not pick up too much
[0020]
More specifically, in the present embodiment, a unidirectional microphone, a super directional
microphone, or the like is used as the microphone 11a, and the directivity direction is set to the
speaker. The microphone 11a is a directional microphone, and the directional direction is
03-05-2019
7
directed to the speakers 1a and 2a, so the conversational sounds emitted by the speakers 1a and
2a are collected with high sensitivity while coming from other directions. Noise is not picked up
very much. As described above, in the present embodiment, since noise coming from the
surroundings is not collected so much, the sound collected by the sound collection unit 10a of
FIG. 1 is emitted from the sound emission unit 30a as it is to the speakers 1a and 2a. Even if this
is done, the speakers 1a and 2a will not feel noisy or it will not be difficult for the speakers 1a
and 2a to hear the speech sound. And also in this embodiment, since the conversational sound is
emitted only from the directional speaker 20a of the sound emitting unit 30a in the direction in
which the speakers 1a and 2a exist, each speaker 1a and 2a is the voice of the other It is possible
to prevent the other person other than the speaker from listening to the speech without
disturbing the voice of the speaker. This point is the same as the first and second embodiments
described above. In addition, if the sound collecting unit 10a and the sound emitting unit 30a are
arranged such that the directivity direction of the microphone 11a and the sound emitting
direction of the directional speaker 20a do not overlap, the microphone of the conversation
sound emitted from the directional speaker 20a Sound collection by 11a is avoided, and the
occurrence of howling is also avoided. It should be noted that an internal drive mechanism may
be provided to adjust the directivity direction of the directional microphone 20a so that the
conversation sound can be picked up with high sensitivity even if the speakers 1a and 2a talk at
slightly different positions. .
[0021]
Further, the sound pickup unit 10a is provided with a first directional microphone for picking up
the voice from the speaker 1a and a second directional microphone for picking up the voice from
the speaker 2a. The voice produced and the voice produced by the speaker 2a may be picked up
by separate directional microphones. As described above, when the voice of each talker is
separately collected, the voice directly picked up by the second directional microphone (the voice
emitted by the speaker 2a) is directly transmitted to the speaker immediately above the speaker
1a. Sound is emitted, and the speaker immediately above the speaker 2a is made to emit the
sound collected by the first directional microphone (sound emitted by the speaker 1a), that is, to
the speaker immediately above each talker Preferably emit the voice of the other party. This is
because one's own voice tends to be heard more easily than the other's voice, and some people
are anxious to hear their own voice delayed via a speaker or the like. According to this, it
becomes possible to make both the speakers 1a and 2a hear the other party's voice well without
feeling the sense of incongruity that their own voice is delayed. In addition, a first directional
microphone for picking up the sound from the speaker 1a and a second directional microphone
for picking up the sound from the speaker 2a are provided in the sound collection unit 10a, and
the sound emission unit is a speaker In the case of an array, directivity control of the speaker
array may be performed such that only the voice of the conversation partner arrives from the
03-05-2019
8
head (or the conversation partner's head) for each speaker.
[0022]
Also, as the directional microphone 11a, in addition to unidirectional microphones and
superdirective microphones, microphones having various directivity such as bi-directional
microphones, narrow directional microphones, and sharp directional microphones can also be
used. is there. Furthermore, as the directional microphone 11a, a microphone array configured
by arranging a plurality of nondirectional microphones may be used. According to the
microphone array, the same effect as in the case of using a directional microphone which picks
up the conversational sounds of the speakers 1a and 2a with high sensitivity is obtained.
[0023]
Fourth Embodiment In the above-described third embodiment, the conversational sound emitted
by the talker is collected by the directional microphone, thereby avoiding the collection of
surrounding noise in addition to the conversational sound. On the other hand, in the fourth
embodiment of the present invention, the same effect as that of the third embodiment is realized
by removing noise from the sound collected by the sound collection unit.
[0024]
FIG. 5 is a block diagram showing the configuration of the sound collection unit of the
conversation information leak prevention device of the present embodiment. As apparent from
comparison between FIG. 5 and FIG. 2, the configuration of the sound collection unit of this
embodiment is the same as that of the sound collection unit shown in FIG. 2 in that the noise
removal unit 16 for performing signal processing to remove noise is added. Different from the
configuration. The microphone 11 b in FIG. 5 is a nondirectional microphone as in the
microphone 11 a of the first embodiment. Therefore, in the sound collection unit shown in FIG. 5,
in addition to the conversational sounds of the speakers 1a and 2a, noise coming from the
surroundings is also collected by the microphone 11b. As shown in FIG. 5, the audio signal
output from the microphone 11 b is given to the noise removing unit 16. The noise removal unit
16 performs signal processing (hereinafter, noise removal processing) for removing noise signal
components from the voice signal and outputs the processed signal to the amplifier circuit 12 b.
As noise removal processing, band pass filter processing for passing only frequency components
03-05-2019
9
corresponding to speech sounds, digital signal processing for reducing the signal strength of
frequency components corresponding to noise by frequency analysis, or voice of reverse phase of
noise components Phase processing or the like may be considered in which a signal is generated
and superimposed on the original audio signal. When band pass filter processing is employed as
the noise removal processing, the noise removal unit 16 may be configured by an analog filter,
and when the above digital processing or phase processing is employed, the noise removal unit
16 is configured by a DSP. Just do it. As described above, in the present embodiment, since the
conversational sound is emitted from the directional speaker 20a by removing noise from the
sound collected by the microphone 11b, the speakers 1a and 2a can hear the clear
conversational sound. It becomes possible.
[0025]
Further, by combining the third embodiment and the fourth embodiment, the microphone 11b of
the sound collection unit 10a is a directional microphone, and the conversational sound is
collected with high sensitivity by the directional microphone, and the speech signal of the
collected conversational sound From the above, after the noise removing unit 16 removes noise,
the conversational sound may be emitted from the directional speaker 20a of the sound emitting
unit 30a. With such an embodiment, it becomes possible to make the speakers 1a and 2a hear
clearer speech sounds.
[0026]
Fifth Embodiment In the first to fourth embodiments described above, the conversational sound
picked up by the sound collection unit is emitted only from the directional speaker of the sound
emission unit installed on the ceiling in the direction in which the speaker is present By
sounding, it has realized that the speaker can hear the conversation sound well while preventing
the leakage of the conversation sound around the conversation space. However, when part of the
conversational sound emitted from the directional speaker toward the speaker reaches the floor
and is reflected, the reflected conversational sound may also leak and spread around the
conversation space. Conceivable. The conversation information leakage prevention apparatus
according to the fifth embodiment of the present invention has a configuration for preventing the
spread of leakage due to floor reflection of conversation sound emitted toward a speaker from a
directional speaker disposed on a ceiling of a conversation space. It differs from the
configuration of the conversation information leakage prevention apparatus of the first to fourth
embodiments in that it has.
03-05-2019
10
[0027]
FIG. 6 is a diagram showing the configuration of the conversation information leak prevention
device of the present embodiment. As shown in FIG. 6, in the conversation information leakage
prevention apparatus of this embodiment, the conversation sound collected by the sound
collection unit 10c and the sound collection unit 10c for collecting the conversational sounds of
the speakers 1c and 2c in the conversation space In addition to the sound emitting unit 30 c that
emits sound only in the direction in which the speakers 1 c and 2 c exist, the sound absorbing
unit 70 a that absorbs sound is included. As shown in FIG. 6, the sound emitting unit 30 c is
installed on the ceiling 40, and the sound absorbing unit 70 a is installed on the floor surface 50
at a position facing the directional speaker 20 c of the sound emitting unit 30 c. It is preferable
to use, for example, glass wool, rock wool, gypsum or the like for the sound absorbing portion 70
a. Although part of the conversational sound emitted from the directional speaker 20c installed
on the ceiling 40 reaches the floor surface 50, the sound absorbing unit 70a is installed at the
arrival position, so the floor surface 50 is reached. A part of the conversational sound is absorbed
by the sound absorption unit 70a. Thereby, the speech sound reflected on the floor surface 50 is
reduced. As described above, according to the present embodiment, it is possible to reduce the
reflection of the conversational sound by the floor surface 50 and to prevent the leakage of the
conversational sound due to the floor surface reflection. In addition, according to the present
embodiment, by reducing the reflected sound from the floor surface 50, the speakers 1c and 2c
can easily hear the speech sound from the directional speaker 20c.
[0028]
In the present embodiment, the sound absorbing unit 70a is installed at a position facing the
directional speaker 20c of the sound emitting unit 30c on the floor surface 50. However, the
installation position of the sound absorbing unit 70a is not limited to the position facing the
directional speaker 20c, and the conversation emitted from the directional speaker 20c such as a
position slightly shifted from the position facing the directional speaker 20c It may be a position
where at least a part of the sound reaches. This is because the reflection of the speech sound at
the position is reduced, and the same effect as that of this embodiment can be obtained. In
addition, when the directional speaker 20c of the sound emitting unit 30c is installed on the floor
surface 50, at least a part of the sound emitted from the directional speaker 20c installed on the
floor surface 50 (for example, The sound absorbing unit 70a may be installed at a position facing
the directional speaker 20c in the ceiling 40).
03-05-2019
11
[0029]
Sixth Embodiment In the first to fifth embodiments, the conversation sound is picked up and
emitted only in the direction in which the talker is present, so that the talker does not speak in a
louder voice than necessary. It made it possible to hear the speech sound well and to prevent the
speech sound from spreading around. On the other hand, in the present embodiment, in addition
to the speech sound being picked up and emitted only in the direction in which the speaker is
present, the masking sound is emitted around the speech space. The masking effect by the
masking sound makes it difficult to recognize the contents of the conversation from the speech
sound directly emitted by the speaker around the speech space, thereby enhancing the
prevention of leakage of speech information to the periphery of the speech space.
[0030]
FIG. 7 is a diagram showing the configuration of the conversation information leakage prevention
apparatus according to the sixth embodiment. As shown in FIG. 7, in the conversation
information leakage prevention apparatus of the present embodiment, the speech collection unit
10d that collects the speech sound of the talker in the speech space, and the conversation sound
collected by the sound collection unit 10d A masking unit 60a is included in addition to the
sound emitting unit 30d that emits sound only in the direction of the person. The masking unit
60a is a device that emits a masking sound that generates a masking effect, and is installed on
the floor of the conversation space with the sound emission surface directed in the opposite
direction to the speaker. As a masking sound to be emitted to the masking unit 60a, an
environmental sound, a performance sound of a musical instrument, or a disturbing sound that
makes it impossible to understand what content is being used may be used. Also, a masking
sound may be generated based on the conversation sound picked up by the microphone 10 d (for
example, generated using the method disclosed in Japanese Patent Application Laid-Open No.
2008-233671). Although both the speech sound and the masking sound directly emitted from
the speaker are diffused to the surroundings, the masking effect by the masking sound disturbs
the grasp of the contents of the speech from the speech sound.
[0031]
In addition, the internal drive adjusts the angle and directivity level of the sound emitting surface
of the masking unit 60a so that the masking effect can be adjusted according to the structure and
size of the room in which the conversation information leakage prevention device is installed. A
03-05-2019
12
mechanism may be provided. Also, the installation position and the installation number of the
masking unit 60a may be changed according to the structure, size, etc. of the room in which the
conversation information leakage prevention device is installed.
[0032]
Seventh Embodiment FIG. 8 is a diagram showing the configuration of a conversation
information leakage prevention apparatus according to a seventh embodiment. As shown in FIG.
8, in the conversation information leakage prevention apparatus of the present embodiment, the
speech collection unit 10e that collects speech sounds of the speakers 1e and 2e in the
conversation space, and the conversation collected by the speech collection unit 10e. In addition
to the sound emitting unit 30e that emits sound only in the direction in which the speakers 1e
and 2e exist, it includes a partition 80a that divides the conversation space from the other space.
If the height of the partition is high enough (for example, the height of the positions of the
speakers 1e and 2e above the head of the speaker sitting on the table across the table in the
conversation space), from the speakers 1e and 2e It is possible to reduce the diffusion of directly
emitted speech sounds into the surroundings and reduce the noise entering the speech space
from the surroundings, and each of the speakers 1e and 2e can hear speech sounds better .
Furthermore, by being partitioned by the partition 80a, the speakers 1e and 2e can talk without
worrying about the eyes around them, and the psychological burden on the speakers 1e and 2e is
reduced. is there.
[0033]
Eighth Embodiment In the first to seventh embodiments, the sound emitting unit for emitting the
speech sound picked up by the sound collection unit only to the direction in which the talker
exists is installed on the ceiling of the conversation space. However, when the layout of the room
is frequently changed, it may be difficult to install the sound release unit on the ceiling.
Therefore, the conversation information leakage prevention apparatus of the eighth embodiment
of the present invention is characterized in that a sound emitting unit is provided in a partition
that divides a conversation space from another space. FIG. 9 is a view showing the configuration
of the conversation information leakage prevention apparatus of the eighth embodiment of the
present invention. As shown in FIG. 9, the conversation space where the conversation
information leakage prevention device of the present embodiment is installed is partitioned from
other spaces by partitions 80b and 80c. In this conversation space, speakers 1f and 2f face each
other across the table, sit and talk. A sound pickup unit 10f for collecting speech sounds is
installed on this table. As shown in FIG. 9, the partitions 80b and 80c are installed to face each
03-05-2019
13
other with the speakers 1f and 2f interposed therebetween. The conversation space side of one
of the partitions 80b and 80c (in the present embodiment, the partition 80b) is released at a
position higher than the table (for example, at the height of the head of a speaker who is talking
over the table). The sound unit 30f is installed. The sound emitting unit 30f includes a directional
microphone 20f, and the directional microphone 20f is disposed on the conversation space side
of the partition 80b so that the directional direction of the directional microphone 20f is directed
to the speakers 1f and 2f. The sound absorbing unit 70b is located at a position where at least a
part of the sound emitted from the directional speaker 20f reaches the surface on the
conversation space side of the partition 80c (in the present embodiment, the position facing the
directional speaker 20f). Is provided.
[0034]
The conversational sound emitted by the speaker is collected by the sound collection unit 10f
and emitted from the directional speaker 20f installed in the partition 80b. As described above,
since the directional speaker 20f is installed at substantially the same height as the heads of the
speakers 1f and 2f talking over the table, the speakers 1f and 2f in the conversation space are
directional The conversation sound emitted from the speaker 20 f can be heard. Although part of
the conversational sound emitted from the directional speaker 20f reaches the partition 80c, the
sound absorption unit 70 is provided at the reaching position. Therefore, part of the speech
sound that has reached the partition 80c is absorbed by the sound absorption unit 70b, and the
speech sound reflected by the partition 80c is reduced. As described above, also according to the
present embodiment, the conversation sound picked up by the sound pickup unit is emitted only
in the direction in which the speaker is present by the sound emission unit. Can be heard well,
and it is possible to prevent the spread of the speech sound to the surroundings. In addition, in
the present embodiment, each of the directional speaker 20f and the sound absorbing unit 70b
that absorbs the sound emitted from the directional speaker 20f is provided in each of the
partitions 80b and 80c. Therefore, movement of the partitions 80b and 80c makes it possible to
easily change the location of the conversation space.
[0035]
Also, a masking unit 60b may be installed at the end of the partitions 80b and 80c in this
conversation space, and according to such an aspect, the speech sound emitted directly from the
speakers 1f and 2f leaks out of the conversation space It is possible to prevent the leakage of
conversational information caused by
[0036]
03-05-2019
14
Further, in the present embodiment, the sound emitting unit 30f and the sound absorbing unit
70b are integrally incorporated in each of the partitions 80b and 80c, but may be retrofitted to
each of the partitions 80b and 80c.
In this case, the partitions 80b and 80c and the conversation information leakage prevention
device may be separately distributed.
[0037]
In the present embodiment, the directional speaker 20f is installed in the partition 80b, and the
sound absorbing unit 70b is installed in the partition 80c. However, the directional speaker 20f
may be installed in either the partition 80b or 80c without installing the sound absorbing unit
70b. Alternatively, the directional speaker 20f may be installed in both the partitions 80b and
80c without installing the sound absorbing unit 70b. Thus, according to the aspect of emitting
the speech sound only from the directional speaker 20f installed in one or both partitions toward
the direction in which the speakers 1f and 2f exist, as in the other embodiments, It becomes
possible to make both the speakers 1 f and 2 f hear the speech sound well while preventing the
sound from leaking around.
[0038]
<Modifications> Although the first to eighth embodiments of the present invention have been
described above, the following modifications may of course be added to these embodiments. (1)
In the first to seventh embodiments described above, the sound emitting unit having directivity
characteristics that emits the speech sound only in the direction in which the speaker is present
is installed on the head of the speaker, and the eighth embodiment is implemented. In form, the
sound emission part was installed right next to the speaker. However, a sound emitting unit
having a directional characteristic that emits a conversational sound only in the direction in
which the speaker exists may be disposed obliquely backward or obliquely forward of the
speaker. For example, when the speaker 1 f in FIG. 9 is a customer and the speaker 2 f is a
receptionist's bank clerk, such as a bank window, the other customer may be behind the speaker
1 f who is the customer. It is not preferable that the speech sound of the speakers 1 f and 2 f
leaks to the back side of the speaker 1 f because there may also exist. On the other hand, since
there are no other customers behind the speaker 2f who is a bank clerk, no particular problem
03-05-2019
15
occurs even if the speech sound of the speakers 1f and 2f leaks to the back of the speaker 2f. In
this case, in the partition 80b, the sound emitting unit 30f (or the directional speaker 20f of the
sound emitting unit 30f) is installed at a position diagonally behind the speaker 1f who is a
customer, and the direction of the speaker 2f who is a bank clerk The conversational sound is
emitted toward the end. In this way, the customer speaker 1f who is the customer can hear the
speech sound coming from the oblique rear, and the speaker 2f who is the bank clerk can hear
the speech sound coming from the oblique front, and the speaker 1f It is possible to prevent the
leakage of speech sound to the back side. As described above, when there is a specific direction
in which the leakage of the speech sound is permitted (the leakage does not cause any particular
problem), the direction of the speaker as seen from the sound emitting portion (that is, the
emission of the speech sound If the sound emitting unit is installed (or the directivity
characteristics are controlled) so that the sound direction and the specific direction are
substantially the same, the conversation sound is emitted, the other than the specific direction. It
becomes possible to make a speaker hear a speech sound favorably, preventing leakage of the
speech sound in the direction.
[0039]
(2) Although the first to eighth embodiments of the present invention have been described, the
elements described in the respective embodiments may be combined according to the installation
place of the conversation space and the required leakage prevention level.
[0040]
(3) Also, in the first to eighth embodiments, two speakers are described, but the number of
speakers is not limited to two, and may of course be three or more.
When the number of speakers is three or more, directional microphones may be directed to each
speaker. Also, at that time, the voices of all persons including one's own voice may be emitted by
each talker from the directional speaker directed to each talker, and other people except one's
own voice The voice of the speaker may be emitted to each speaker.
[0041]
1a, 1b, 1c, 1d, 1e, 1f, 2a, 2b, 2c, 2e, 2f ... talkers, 10a, 10b, 10c, 10d, 10e, 10f ... collection units,
20a, 20b, 20c, 20d 20e, 20f ... directional speaker, 30a, 30b, 30c, 30d, 30f ... sound emitting
part, 40 ... ceiling, 50 ... floor, 60a, 60b ... masking part, 70a, 70b ... sound absorbing part, 80a,
80b ... Partitions 11a and 11b Microphones 12a and 12b 24 Amplifier circuits 13a and 13b
03-05-2019
16
Modulation circuits 14a and 14b Carrier wave transmission circuits 15a 15b 21 Antennas 22
Tuning circuits 23 Demodulation circuits , 16 ... noise removal unit
03-05-2019
17
1/--страниц
Пожаловаться на содержимое документа