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JPH02217100

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DESCRIPTION JPH02217100
[0001]
[Introduction A stereo sound receiving type headset that can be used in a conference system
such as a video conference call or an audio conference by telephone, and which enables stereo to
stereographic transmission. In order to make the transmission quality of voice excellent and easy
to use, a plurality of sound receiving units are provided near the mouth of the caller to perform
stereophonic sound reception, and when the voice level of the caller exceeds a predetermined
value, the call The voice signal of the person is configured to be added to the signal received
stereophonically. [Industrial field of application The present invention relates to a stereo sound
receiving type headset which can be used in a stereophonic transmission and is used in a
conference system such as a video conference or a telephone conference call. In recent years,
with the development of conference systems such as teleconferencing and voice conferences by
telephone held with remote parties, it is as if both parties wanted to have a conference in the
same place and transmitted the same sound, that is, they have their own It is required to transmit
the sound field of the field to the other party as much as possible. In particular, when the sound
is transmitted and reproduced in stereophonic fashion together with the surrounding
environmental sound, the other party's voice can be localized at one point in the spread
environmental sound and the presence feeling and the intelligibility are improved and useful.
[Background Art] Conventionally, in a conference system such as a video conference or an audio
conference by telephone, a table-type or tie-pin type microphone installed in advance and a fixed
installation type speaker are used. As in the case of the telephone of, the monaural sound is
received and the monaural sound is transmitted to the other party. [Problems to be solved by the
invention] However, with the development of communication networks, it is necessary to
improve the transmission quality of such a conference system, in order to do so, to the other
party with stereophonic sound along with the ambient sound. Implementation of stereophonic
transmission to transmit and reproduce is a powerful means. In order to realize stereophonic
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transmission, it is conceivable to use a conventional stereophonic microphone, but all of them are
large or have a large number of parts, and they are not suitable as communication terminals.
Accordingly, in the future, it is desirable to provide a simpler device so that a conference system
capable of stereophonic sound transmission can be easily used by a small number of people. In
addition, in order to realize stereophonic transmission, it may be possible to construct a compact
device by installing a stereophonic microphone that can accurately receive surrounding sounds
at the mouth of a talker, but in this case, the talker's Since the mouth is located at or near the
direction of the blind spot of the directivity of the microphone, the voice of the caller can not be
clearly transmitted, which causes a problem in the transmission quality of the call voice.
The present invention has been made in view of such a situation, and enables stereophonic
transmission with a configuration to the Konbak 1 and provides a stereo sound receiving type
headset which is excellent in transmission quality of call voice and easy to use. The purpose is
[Means for Solving the Problems] FIG. 1 is a principle block diagram of the present invention. In
FIG. 1, reference numeral 1 denotes a microphone storage unit disposed in the vicinity of the
mouth of a talker in a headset for telephone call, and 2a, 2b and 3 denote three omnidirectional
electrets 1 provided in the microphone storage unit 1. A microphone (sound receiving unit), 4 is
a delay calculation circuit connected to the microphone 3 to delay and output an audio signal
from the microphone 3; 5a and 5b, the delayed sound signal from the delay calculation circuit 4
to the microphones 2a and 2b , And an arithmetic unit that subtracts from the audio signal from
the microphone 2a, 2.a. While the delay arithmetic circuit 4 and the arithmetic unit 5a constitute
a set of unidirectional microphones, the microphones 2b, 2. Another set of unidirectional
microphones is configured by the delay calculation circuit 4 and the calculator 5b. Then,
stereophonic sound reception is performed by these two sets of unidirectional microphones. また
、6a、6bはマイクロホン2a、2b。 The left and right speakers of the other party who
stereophonically transmit the audio signal received by 3 are the switches 8 from the off (open)
state when the audio level of the talker received by the microphone 3 exceeds a predetermined
value The control means for switching to the (closed) state is such that when the switch 8 is
turned on (closed), an audio signal from the microphone 3 is output to adders 9a and 9b
described later. Reference numerals 9a and 9b denote adders for adding the audio signals from
the microphone 3 to the audio signals (stereophonic signals received) from the microphones 2a
and 2b. [Operation] Microphones 2a and 2b according to the above configuration. 3.
Stereophonic sound reception is performed by two sets of unidirectional microphones configured
by the delay calculation circuit 4 and the arithmetic units 5a and 5b, and environmental sound
around the communicator is the speaker 6a of the other party, 6b stereophonic transmission.
When it is determined by the control means 7 that the voice level received by the microphone 3
exceeds the predetermined value, it is determined that the caller has made a voice, and the
control means 7 turns off at normal times (normally The switch 8 in the open state is switched to
the on (closed) state, the audio signal from the microphone 3 is added to the audio signal from
the microphones 2a and 2b by the adders 9a and 9b, respectively, and the speaker 6a on the
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other side It is transmitted to 6b.
Hereinafter, the present invention will be described in detail with reference to the drawings. First,
the specific structure of the stereo sound receiving type bed set of this embodiment will be
described with reference to FIG. 3. FIG. 3 is a perspective view thereof. In FIG. 11.11 is a pair of
front and rear head belts, 12 ° 12 is a holding frame provided at the left and right ends of the
head belt 11, 13.13 is a headphone attached to each holding frame 12 and emitting sound of the
other party 14 A receiver holder shaft attached to one holding frame 12 and a receiver support
rod 15 slidably attached to the receiver holder shaft 14, the tip of the receiver support rod 15
The microphone storage unit 1 is provided to adjust the position of the sound receiver support
bar 15 so that the microphone storage unit 1 is arranged in the vicinity of the mouth of the
caller. Further, as shown in FIG. 4, in the microphone storage unit 1, three omnidirectional
electric 1-red microphones (sound receiving units) 2a, 2b, 3 are incorporated. The microphones
2a, 2b, 3 are, for example, at a diameter of about 5 mn and spaced apart from each other by 1 to
2 cm, and are arranged at apexes of an equilateral triangle, and two microphones 2a, 2b are on
the talker side 3 is outside. FIG. 2 is a block diagram showing an embodiment of the present
invention. As shown in FIG. 2, a delay operation circuit 4 for delaying and outputting an audio
signal from the microphone 3 is connected to the microphone 3 On the other hand, computing
units 5a and 5b are connected to the microphones 2a and 2b, respectively, and the delayed voice
signal from the delay computing circuit 4 is subtracted from the voice signal from the
microphones 2a and 2b by the computing units 5a and 5b. It is supposed to be output. Here, as
shown in FIG. 5, the above-mentioned microphones 2a, 3. While the delay arithmetic circuit 4
and the arithmetic unit 5a constitute a set of single directional microphones of the directional
main axis S □, the microphones 2b, 2. Another set of uni-directional microphones of the
directivity main axis S2 is configured by the delay calculation circuit 4 and the calculator 5b. By
arranging these two sets of unidirectional microphones such that their directivity main axis S □
182 forms an appropriate angle as shown in FIG. 2.4.5, a unidirectional microphone pair can be
obtained. Stereophonic sound reception of environmental sound around a talker by sound system
is performed. The sound pickup characteristic of this unidirectional microphone pair sound
pickup system is as shown in FIG. 6 (a).
On the other hand, the microphone 3 is connected to the control means 7 as well as to the adders
9a and 9b via the switch 8 in the off (open) state at the normal time. The control means 7
controls the opening and closing of the switch 8 and detects the voice level of the communicator
received by the microphone 3 and the switch when the detection result of the level detection
portion 7a exceeds a predetermined value. The control unit 7 b is configured to switch 8 from
the off (open) state to the on (closed) state. The adders 9a and 9b are provided on the output side
of the computing units 5a and 5b, respectively. When the switch 8 is turned on, the audio signals
from the computing units 5a and 5b (that is, stereo by the microphones 2a, 2b and 3) The audio
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signal of the microphone 3 is added to the phonyk received signal). なお、6a、6bはマイクロ
ホン2a、2b。 3 shows left and right speakers on the other side where stereophonic
transmission of the sound signal received by 3 is performed. Microphones 2a and 2b according
to the configuration described above. 3. Two sets of unidirectional microphones having a
directional main axis S □ 182, composed of the delay calculation circuit 4 and the arithmetic
units 5a and 5b, perform stereophonic sound reception by the pair microphone sound collecting
method, The ambient sound around the caller is stereophonically transmitted to the other
speaker 6a, 6b. At this time, these directivity main axes S1. Since S2 must face forward (or to the
side) of the caller on the horizontal plane, the caller's mouth will be located at or near the
directional dead angle direction, and the transmission quality of the caller voice Problems may
occur. Therefore, in the present embodiment, the sound level received by the microphone 3 is
detected by the level detection unit 7a in the control unit 7, and the control unit 7b determines
that the sound level exceeds a predetermined value. The controller 7b determines that the switch
8 in the off (open) state is normally switched to the on (closed) state by the control unit 7b. As a
result, the voice signals of the talker extracted by the microphone 3 are added to the left and
right signals received by the stereophonics from the microphones 2a and 2b (computers 5a and
5b) by the adders 9a and 9b, respectively. It is transmitted to the side speakers 6a, 6b. Thus,
according to the present embodiment, a plurality of (three) microphones 2a, 2b and 3 for
realizing stereophonic sound reception are accommodated in substantially the same case
(microphone storage unit 1), and Since stereophonic sound reception has been realized in a
relatively narrow space near the mouth, stereophonic transmission can be performed with a very
converse 1-like configuration, and since it is a headset type, both hands are free (hand You can
talk on the free) and it will be extremely easy to use.
Also, when the level detection unit 7a detects the presence of the voice of the caller, the voice
signal is added to the left and right signals received by the stereophonic sound, so that the
presence of the voice around the caller is transmitted to the other party. There is also an
advantage that the voice of the voice is clearly transmitted and the transmission quality is greatly
improved. In the above embodiment, although the three microphones 2a, 2b and 3 are
incorporated in the microphone storage unit 1 arranged at a position near the mouth of the
caller, in order to make the microphone storage unit 1 smaller and lighter, The microphone
housing portion 1 is provided with only a sound receiving hole for picking up a sound without
actually housing the microphone, and a tube provided along the sound receiver support bar 15
receives the sound at the sound receiving hole. The sound produced may be guided to each
microphone element incorporated in the receiver holding shaft 14. Further, in the above
embodiment, in order to realize the stereophonic sound reception, the case where the pair
microphone sound collecting method of the unidirectional microphones having the sound
collecting characteristics as shown in FIG. In addition to the above, a pair microphone sound
pickup system (x-y system) of a bidirectional microphone having a sound pickup characteristic as
shown in FIG. 6 (b) and a sound pickup characteristic as shown in FIG. 6 (c) will be described.
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Even if the m-s microphone sound pickup method (hypercardioid pair microphone sound pickup
method) is adopted, the same operation and effect as the above-described embodiment can be
obtained. [Effects of the Invention] As described in detail above, according to the stereo sound
receiving type headset of the present invention, a plurality of sound receiving units are provided
near the mouth of the caller to perform stereophonic sound reception, and When the voice level
of the speaker exceeds the predetermined value, the voice signal of the speaker is added to the
stereophonic sound received signal, so that stereophonic transmission is possible with a compact
configuration, and the voice of the call is provided. Transmission quality and ease of use are
greatly improved.
[0002]
Brief description of the drawings
[0003]
1 is a block diagram showing the principle of the present invention, FIG. 2 is a block diagram
showing an embodiment of the present invention, FIG. 3 is a perspective view showing a specific
structure of a headset according to the present embodiment, and FIG. 6 is an enlarged
perspective view showing the microphone storage unit of the present embodiment, FIG. 5 is a
block diagram showing the construction principle of the unidirectional microphone in the
present embodiment, and FIGS. It is a characteristic view for explaining a sound system.
In the figure, 1 is a microphone storage unit, 2a, 2b and 3 are omnidirectional electret
microphones (sound receiving unit), 4 is a delay calculation circuit, 5a and 5b are calculation
units, 6a and 6b are speakers, 7 is a control means, 7a is a level detection unit, 7b is a control
unit, 8 is a switch, 9a, 9b is an adder, 10 is a headset for speech, 11 is a head belt, 12 is a holding
frame, 13 is a headphone, 14 is a receiver The shaft 15 is a receiver support bar. Big
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