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JP2002078092

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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 JP2002078092
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an
indoor interrogation system, and more particularly, to an indoor interrogation system for
managing an indoor interrogation.
[0002]
2. Description of the Related Art Heretofore, as this type of room crossing system, a system for
transmitting and receiving voice signals from a room crossing terminal and a management
apparatus using radio waves has been proposed. In this device, the indoor communication
terminal transmits the microphone for the terminal, the transmitter for the terminal that
transmits the voice signal input from the microphone for the terminal as the carrier wave of the
predetermined frequency, and the carrier wave of the predetermined frequency as the carrier
wave A terminal receiver capable of receiving the received audio signal, and a headphone type
speaker for outputting the audio signal received by the terminal receiver; and the management
apparatus is transmitted from the terminal transmitter of the indoor communication terminal
Receiver for a device capable of receiving an audio signal, a speaker for outputting a voice signal
received by the device receiver, a microphone for the device, and a radio wave of a
predetermined frequency which is an audio signal input from the device microphone And an
apparatus transmitter for transmitting as a carrier wave.
[0003]
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1
However, in a room crossing system which transmits and receives an audio signal by using such
radio waves as a carrier wave, it is difficult to keep secrecy of the contents of the exchange. The
radio waves are reflected by the walls forming the inside and the outside of the room, but a part
thereof is radiated to the outside as leaked radio waves. By receiving this leaked radio wave, the
contents of the talk will leak. On the other hand, in order to prevent leaked radio waves, it is
conceivable to form the walls forming the inside and outside of the room with a material having a
high radio wave blocking effect, but in this case, the cost of forming the walls is increased.
[0004]
The indoor interrogation system of the present invention has an object to keep secrecy of the
contents of the interrogation. Moreover, the indoor interrogation system of this invention makes
it one object to perform communication with an indoor interrogation terminal and a management
apparatus smoothly. Furthermore, it is an object of the present invention to aim at facilitating
installation and removal of the system.
[0005]
Means for Solving the Problems and their Functions and Effects In order to achieve at least a part
of the above-mentioned object, the room interrogation system of the present invention adopts the
following means.
[0006]
According to a first aspect of the present invention, there is provided a room-crossing system for
managing a room-crossing, comprising: a terminal-side voice receiving means for receiving voice
and converting it into a voice signal; Terminal-side frequency modulation means for frequencymodulating the voice signal from the terminal-side voice reception means to generate a voice
high-frequency signal, and terminal-side infrared radiation for converting the voice highfrequency signal generated by the frequency modulation to infrared radiation A management
device comprising: at least one portable indoor communication terminal comprising: means, an
apparatus-side infrared light receiving means capable of receiving infrared light, and an
apparatus-side demodulation means for demodulating into an audio high frequency signal
obtained by the light reception; The infrared light emitted from the terminal-side infrared
radiation means of the indoor communication terminal is received, and the audio high-frequency
signal obtained by the light reception is transmitted to the device side of the management
apparatus using the infrared light And summarized in that and a relay means for relaying the line
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2
receiving means.
[0007]
According to the first indoor communication system of the present invention, since the
transmission of the audio signal from the indoor communication terminal to the management
apparatus is relayed by the relay means using infrared rays, the walls forming the inside and the
outside of the room Does not leak out to the outside.
As a result, it is possible to keep secrecy of the content of the conversation.
Moreover, since the relay means relays using infrared rays, there is no need to install a wired
communication cable or the like. Therefore, the installation and removal of the system can be
facilitated.
[0008]
In the first indoor communication system of the present invention, the indoor communication
terminal comprises a terminal-side infrared light receiving means capable of receiving infrared
light, and a terminal side demodulation means for demodulating the received infrared light into
an audio signal. Terminal-side audio output means for outputting the voice signal thus
demodulated as voice, the management device receiving device voice for receiving voice and
converting it to voice signal, and device-side voice receiving means for high frequency signal A
device-side frequency modulation means for frequency-modulating the audio signal from an
audio signal to generate an audio high-frequency signal; a device-side infrared radiation means
for converting the audio high-frequency signal generated by the device-side frequency
modulation means into infrared radiation; And the relay means receives the infrared radiation
emitted from the device-side infrared radiation means of the management device and uses the
infrared high frequency sound signal obtained by the light reception. It may be assumed to be a
means for relaying to the terminal side infrared reception section of the indoor 交話 terminal. In
this way, the audio signal can be transmitted and received bidirectionally by relaying by the relay
means using infrared rays.
[0009]
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3
A second indoor communication system according to the present invention is an indoor
communication system for managing indoor communication, which comprises terminal side
infrared light receiving means capable of receiving infrared light, and the received infrared light
as an audio signal. At least one portable indoor communication terminal comprising terminal-side
demodulation means for demodulating and terminal-side voice output means for outputting the
voice signal as voice, and device-side voice for receiving voice as voice signal Receiving means,
device side frequency modulation means for modulating the frequency of the high frequency
signal with the audio signal from the device side audio receiving means to generate an audio high
frequency signal, audio high frequency signal generated by the device side frequency modulation
means A management apparatus comprising an apparatus-side infrared radiation means for
converting into infrared light and emitting the radiation, and infrared rays emitted from the
apparatus-side infrared radiation means of the management apparatus are received and obtained
by the light reception And summarized in that and a relay means for relaying to the terminal side
infrared reception section of the indoor 交話 terminal using infrared audio frequency signal.
[0010]
According to the second indoor communication system of the present invention, since the
transmission of the audio signal from the management device to the indoor communication
terminal is relayed by the relay means using infrared rays, the walls forming the inside and the
outside of the room Does not leak out to the outside.
As a result, it is possible to keep secrecy of the content of the conversation. Moreover, since the
relay means relays using infrared rays, there is no need to install a wired communication cable or
the like.
[0011]
In the first or second room interworking system of the present invention, the relay means may be
means for relaying using at least one repeater.
[0012]
In the first or second indoor communication system according to the present invention in which
the relay means uses a relay, the relay can be obtained by receiving infrared light for relays
capable of receiving infrared light, and the light reception. It is also possible to provide an
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infrared radiation means for repeaters, which converts high-frequency audio signals into infrared
radiation and emits it.
In the first or second indoor communication system according to the present invention of this
aspect, the relay infrared radiation means converts the high frequency voice signal into different
modulation frequency and converts the high frequency voice signal into infrared light. It can also
be a means of emitting. In this way, the voice high frequency signal can be relayed more
appropriately.
[0013]
BEST MODE FOR CARRYING OUT THE INVENTION Next, embodiments of the present invention
will be described using examples. FIG. 1 is a block diagram showing an outline of a configuration
of a room crossing system 20 according to an embodiment of the present invention. As shown in
the figure, the indoor communication system 20 according to the embodiment includes an indoor
communication terminal 30 movable in the communication room 10, and a management device
60 installed in a management room 12 different from the communication room 10. The relay
system 100 is composed of two relays of a first relay 110 and a second relay 130 for relaying
the indoor communication terminal 30 and the management device 60.
[0014]
The indoor switching terminal 30 comprises a terminal-side transmitting unit 40 having a
microphone 32 attached to the headphones 34 and a terminal-side infrared radiation unit 36
attached near the top of the headphones 34, the headphones 34 and the tops of the headphones
34. And a terminal-side receiving unit 50 having a terminal-side infrared light receiving unit 38
attached in the vicinity, and configured as a mobile terminal capable of transmitting and
receiving audio signals by infrared communication.
[0015]
FIG. 2 is a block diagram showing an example of the configuration of the terminal-side
transmission unit 40 of the indoor cross talk terminal 30. As shown in FIG.
As illustrated, the terminal-side transmission unit 40 of the indoor communication terminal 30
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includes a microphone 32, an audio signal amplifier circuit 42 for amplifying an audio signal
input from the microphone 32, a high frequency signal generation circuit 44, and a high
frequency signal generation circuit. A frequency modulation circuit 46 frequency-modulates the
high-frequency signal from 44 with the audio signal amplified by the audio signal amplifier
circuit 42, and a terminal-side infrared radiation which converts the high-frequency signal
frequency-modulated by the frequency modulation circuit 46 into infrared light And 36. As
illustrated in FIG. 3, the terminal-side infrared radiation unit 36 shifts the pointing axis at N
angles of the infrared radiation elements 37 that emit infrared radiation at the directivity angle
θ1 at substantially the same angle α1 as the directivity angle θ1. It is attached. Therefore, the
substantial directivity angle of the infrared rays radiated from the terminal-side infrared
radiation unit 36 is approximately N × θ1, and even if the cross-talker carrying the indoor cross
talk terminal 30 moves in the cross talk room 10, It can emit infrared rays over a wide range.
[0016]
FIG. 4 is a block diagram showing an example of the configuration of the terminal-side receiving
unit 50 of the indoor communication terminal 30. As shown in FIG. As shown in the figure, the
terminal-side receiving unit 50 of the indoor communication terminal 30 receives the infrared
light and converts it into a high-frequency signal, and the high-frequency signal from the
terminal-side infrared light receiving unit 38 is amplified. The amplifier circuit 52, an audio
demodulation circuit 54 for demodulating an audio signal by frequency discrimination of an
amplified high frequency signal, an audio signal amplifier circuit 56 for amplifying an audio
signal from the audio demodulation circuit 54, an audio signal from the audio signal amplifier
circuit 56 And headphones 34 for audio output of signals. As illustrated in FIG. 5, the terminalside infrared light receiving unit 38 has L × J infrared light receiving elements 39 that receive
infrared light at a directivity angle γ1 and has directivity axes in the vertical and horizontal
directions at substantially the same angle It is attached to Zura. Therefore, the directivity angle
for infrared light reception of the terminal-side infrared light receiving unit 38 becomes L × γ 1
in the horizontal direction and J × γ 1 in the vertical direction, and the person carrying the
indoor communication terminal 30 moves in the communication room 10 Even in this case,
infrared rays can be received in a wide range.
[0017]
The management apparatus 60 comprises an apparatus-side transmitting unit 70 having a
microphone 62 attached to the management console 14 of the management room 12 and an
apparatus-side infrared radiation unit 66 attached to the outer wall of the management room 12;
A device-side receiving unit 80 having a speaker 63 and headphones 64 attached thereto and a
device-side receiving unit 80 having a device-side infrared light receiving unit 68 attached to the
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6
outer wall of the management room 12. And an audio signal can be transmitted and received.
[0018]
FIG. 6 is a block diagram schematically illustrating the configuration of the device-side
transmitting unit 70 of the management device 60. As shown in FIG.
As illustrated, the apparatus-side transmission unit 70 of the management apparatus 60 receives
the microphone 62, the audio signal amplifier circuit 72 that amplifies the audio signal input
from the microphone 62, the high frequency signal generation circuit 74, and the high frequency
signal generation circuit 74. Frequency modulation circuit 76 that frequency-modulates the highfrequency signal by the audio signal amplified by the audio signal amplifier circuit 72, and a
terminal-side infrared radiation unit 66 that converts the high-frequency signal frequencymodulated by the frequency modulation circuit 76 into infrared light And
[0019]
FIG. 7 is a block diagram schematically illustrating the configuration of the device-side receiving
unit 80 of the management device 60. As shown in FIG. As shown in the figure, the device-side
receiver 80 of the management device 60 receives a device-side infrared light receiver 68 that
receives infrared light and converts it into a high frequency signal, and an audio signal of the
high frequency signal from the device-side infrared light receiver 68 by frequency discrimination.
And an audio signal amplifier circuit 84 for amplifying the audio signal from the audio
demodulator circuit 82, and a speaker 63 and headphones 64 for audio output of the audio
signal from the audio signal amplifier circuit 84.
[0020]
FIG. 8 is a block diagram schematically illustrating the configuration of the first repeater 110. As
shown in FIG. The first relay 110 is composed of two relays, a first relay 111 and a second relay
121, as shown in the figure, and is attached to the ceiling of the cross-talk room 10. The first
relay unit 111 receives the infrared radiation emitted from the terminal-side infrared radiation
unit 36 of the indoor communication terminal 30 and converts it into a high frequency signal
from the wide-angle infrared light reception unit 112 for relay and the wide-angle infrared light
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7
reception unit 112 for relay Frequency converter 114 for converting the high frequency signal
into a high frequency signal having a different frequency band, and an infrared radiation unit
116 for relay which converts the high frequency signal from frequency converter 114 to infrared
light and radiates it to the second relay 130. And radiates the infrared rays emitted from the
terminal-side infrared radiation unit 36 of the indoor switching terminal 30 to the second
repeater 130 as infrared rays of different frequency bands. As illustrated in FIG. 9, the relay
wide-angle infrared light receiving unit 112 shifts the pointing axis at M angles of approximately
φ2 which are substantially the same as the directivity angle γ2 and M infrared light receiving
elements 113 that receive infrared light at the directivity angle γ2. Is attached. Therefore, the
directivity angle for infrared light reception of the wide-angle infrared light receiving unit 112
for the relay becomes M × γ2, and even if the person carrying the indoor communication
terminal 30 moves in the communication room 10, the infrared light can be It can receive light.
[0021]
The second relay portion 121 of the first relay 110 receives an infrared ray from the second
relay 130 and converts it into a high frequency signal, and an infrared ray receiving portion 122
for the relay, and a high frequency wave from the infrared ray receiving portion 122 for the
relay. A frequency converter 124 for converting the signal into a high frequency signal in a
different frequency band, and a relay wide-angle infrared radiation unit 126 for converting the
high frequency signal from the frequency converter 124 into infrared light and emitting it
toward the inside of the cross room 10 And radiate the infrared rays emitted from the second
repeater 130 into the exchange room 10 as infrared rays of different frequency bands. As
illustrated in FIG. 10, the relay wide-angle infrared radiation unit 126 emits k.times.j infrared
radiation elements 123 that radiate infrared radiation at a directivity angle .theta.2 downward
from the ceiling of the communication room 10 at a directivity angle .theta.2 as illustrated in FIG.
The directional axis is mounted by shifting the directional axis in the vertical and horizontal
directions at substantially the same angle α 2. Therefore, the substantial directivity angle of the
infrared rays radiated from the wide-angle infrared radiation unit 126 for the relay becomes k ×
θ 2 in the horizontal direction and j × θ 2 in the vertical direction, and the cross talk person
carrying the indoor cross talk terminal 30 Even if it moves in the interior of the room 10, it is
possible to emit infrared light to the indoor communication terminal 30.
[0022]
FIG. 11 is a schematic diagram showing the configuration of the second repeater 130. As shown
in FIG. Similarly to the first relay 110, the second relay 130 is also composed of two relays of a
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8
first relay portion 131 and a second relay portion 141 as illustrated. The first relay portion 131
receives an infrared ray radiated from the relay infrared ray emitting portion 116 of the first
relay 110 and converts it into a high frequency signal, and the high frequency power from the
relay infrared ray receiving portion 132 The frequency converter 134 converts the signal into a
high frequency signal different in frequency band, and converts the high frequency signal from
the frequency converter 134 into infrared light and radiates it toward the device-side infrared
receiving unit 68 attached to the outer wall of the control room And an infrared ray emitting unit
136 for the relay, and radiates infrared rays emitted from the infrared ray emitting unit 116 for
the repeater of the first relay 110 to the management device 60 as infrared rays of different
frequency bands. The second relay unit 141 receives an infrared ray from the apparatus-side
infrared radiation unit 66 attached to the outer wall of the management console 14 of the
management apparatus 60 and converts it into a high frequency signal, and an infrared ray
reception for relays. The frequency converter 144 converts the high frequency signal from the
unit 142 into a high frequency signal in a different frequency band, and the infrared radiation for
relay for converting the high frequency signal from the frequency converter 144 into infrared
light and emitting it toward the first relay 110 And an infrared ray emitted from the device-side
infrared radiation unit 66 of the management device 60 toward the second repeater 130 as
infrared rays of different frequency bands.
[0023]
In the indoor communication system 20 thus configured, the audio signal input to the
microphone 32 of the indoor communication terminal 30 is transmitted through the infrared
communication to the first relay unit 111 of the first relay 110 and the second relay 130. The
audio signal output from the speaker 63 or the headphone 64 of the management device 60 via
the relay by the first relay unit 131 and the sound signal input to the microphone 62 of the
management device 60 in reverse is transmitted by infrared communication in the second relay
130. The signal is output from the headphones 34 of the indoor communication terminal 30 via
relay by the second relay unit 141 and the second relay unit 121 of the first relay 110.
[0024]
According to the indoor communication system 20 of the embodiment described above, radiation
is emitted from the indoor communication terminal 30 using the relay system 100 consisting of
two relays of the first relay 110 and the second relay 130. It is possible to relay the infrared rays
to the management device 60 and to relay the infrared rays emitted from the management device
60 to the indoor switching terminal 30.
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Since both the first relay 110 and the second relay 130 communicate using infrared rays, wiring
work and the like can be made unnecessary as compared with those relayed or communicated
using a wired connection. As a result, installation and removal of the indoor communication
system 20 can be easily performed.
[0025]
From the above, according to the indoor communication system 20 of the embodiment, since
transmission and reception between the indoor communication terminal 30 and the management
device 60 are performed using infrared rays, secrecy contents can be kept confidential and
indoors. It is possible to increase the freedom of movement of the crosstalker carrying the
crosstalk terminal 30. Further, the terminal-side infrared radiation unit 36 of the indoor
communication terminal 30 is configured by attaching the N infrared radiation elements 37 with
the directional axis shifted by the directivity angle θ1, and the terminal-side infrared light
reception unit 38 is L × J pieces By arranging the infrared light receiving element 39 so as to
shift the directivity axis in the vertical and horizontal directions by the directivity angle γ1, it is
possible to enhance the freedom of the position and direction of the cross talker carrying the
indoor cross talk terminal 30.
[0026]
Further, according to the indoor communication system 20 of the embodiment, the wide-angle
infrared light receiving portion 112 for the relay of the first relay 110 is attached with the M
infrared light receiving elements 113 shifted by the directivity angle γ2 In addition, the crosstalk for carrying the indoor cross talk terminal 30 is configured by attaching and configuring the
wide-angle infrared radiation part 126 for the relay by shifting the directivity axes to vertical and
horizontal directions by k × j infrared radiation elements 123 The degree of freedom of the
speaker's position and orientation can be increased.
[0027]
In the indoor cross talk system 20 according to the embodiment, the relay system 100 is
composed of two repeaters, the first repeater 110 and the second repeater 130, but it may be
composed of only one repeater or three or more. It may be configured as a repeater.
In addition, the first repeater 110 and the second repeater 130 may not necessarily be installed
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outside the communication room 10.
[0028]
In the relay system 100 of the indoor communication system 20 according to the embodiment,
the high frequency signal is converted into the high frequency signal of a different frequency
band for each repeater, but it is also possible that the frequency of the high frequency signal is
not changed.
[0029]
In the first repeater 110 of the indoor communication system 20 according to the embodiment,
the wide-angle infrared ray receiving unit 112 for repeaters is configured by the M infrared ray
receiving elements 113, but the number of infrared ray receiving elements 113 is one or more.
There may be any number if it is.
Further, in the first repeater 110 of the embodiment, the M infrared light receiving elements 113
are attached with the directivity axes shifted by an angle φ2 substantially the same as the
directivity angle γ2, but if the angles are within the range of the directivity angle γ2 For
example, the directional axis may be slipped and attached using any angle.
[0030]
In the first repeater 110 of the indoor communication system 20 according to the embodiment,
the wide-angle infrared radiation unit 126 for repeaters is constituted by k × j infrared radiation
elements 123, but the number of the infrared radiation elements 123 is one There may be any
number if it is above. Further, in the first repeater 110 of the embodiment, the k × j infrared
radiation elements 123 are attached by shifting the directivity axes in the longitudinal and lateral
directions by an angle α2 substantially the same as the directivity angle θ2, but within the
range of the directivity angle θ2. The pointing axis may be vertically and horizontally shifted for
attachment using any angle as long as
[0031]
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In the indoor communication terminal 30 of the indoor communication system 20 of the
embodiment, the terminal-side infrared radiation unit 36 is configured by the N infrared
radiation elements 37, but the number of infrared radiation elements 37 is one or more. There
may be any number. Further, in the indoor communication terminal 30 of the embodiment, the N
infrared radiation elements 37 are attached with the pointing axis shifted by an angle α1
substantially the same as the pointing angle θ1, but the angle may be within the range of the
pointing angle θ1. For example, the directional axis may be slipped and attached using any
angle.
[0032]
In the indoor communication terminal 30 of the indoor communication system 20 according to
the embodiment, the terminal side infrared light receiving section 38 is constituted of L × J
infrared light receiving elements 39, but the number of the infrared light receiving elements 39
is one or more If it is, there may be any number. Further, in the indoor communication terminal
30 of the embodiment, L × J infrared light receiving elements 39 are attached with the
directivity axes shifted longitudinally and horizontally by an angle φ1 substantially the same as
the directivity angle γ1, but within the range of the directivity angle γ1. The pointing axis may
be vertically and horizontally shifted for attachment using any angle as long as
[0033]
In the indoor communication system 20 of the embodiment, one indoor communication terminal
30 and one management device 60 are used, but a plurality of indoor communication terminals
30 and one management device 60 are used. It may be In this case, the infrared frequency band
may be divided and allocated to the plurality of indoor communication terminals 30, or may be
allocated by time division.
[0034]
Although the indoor communication terminal 30 of the indoor communication system 20
according to the embodiment includes the terminal-side transmission unit 40 and the terminalside reception unit 50, the terminal-side transmission is performed without the terminal-side
reception unit 50. Only the unit 40 may be provided, or conversely, only the terminal-side
receiving unit 50 may be provided without the terminal-side transmitting unit 40. In this case,
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the management device 60 is provided with only the device-side receiving unit 80 without the
device-side transmitting unit 70, and conversely, only the device-side transmitting unit 70 is
provided without the device-side receiving unit 80. , And the first relay unit 111 for relaying the
infrared rays from the indoor communication terminal 30 without the second relay portions 121
and 141 for relaying the infrared rays from the management apparatus 60, the first relay 110
and the second relay 130. , 131 only, or conversely, without the first relay portion 111, 131 for
relaying the infrared ray from the indoor communication terminal 30, only the second relay
portion 121, 141 for relaying the infrared ray from the management device 60 Should be
provided.
[0035]
Although the embodiments of the present invention have been described using the embodiments,
the present invention is not limited to these embodiments in any way, and various modifications
can be made without departing from the scope of the present invention. Of course it can be
implemented in
[0036]
Brief description of the drawings
[0037]
FIG. 1 is a configuration diagram showing an outline of a configuration of a room crossing
system 20 according to an embodiment of the present invention.
[0038]
FIG. 2 is a configuration diagram illustrating an outline of a configuration of a terminal-side
transmission unit 40 of the indoor communication terminal 30.
[0039]
FIG. 3 is an explanatory drawing for explaining how infrared rays are emitted from the terminalside infrared radiation unit.
[0040]
FIG. 5 is a configuration diagram illustrating an outline of a configuration of a terminal-side
receiving unit 50 of the indoor communication terminal 30.
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[0041]
FIG. 5 is an explanatory diagram for explaining how infrared light is received by the terminal-side
infrared light receiving unit 38;
[0042]
FIG. 6 is a configuration diagram illustrating an outline of a configuration of a device-side
transmission unit 70 of the management device 60.
[0043]
FIG. 7 is a configuration diagram illustrating an outline of a configuration of a device-side
receiving unit 80 of a management device 60.
[0044]
FIG. 8 is a configuration diagram illustrating an outline of a configuration of a first relay 110 of
the relay system 100.
[0045]
FIG. 9 is an explanatory view for explaining a state in which infrared light is received by the relay
wide-angle infrared light receiving unit 112 of the first relay 110.
[0046]
FIG. 10 is an explanatory drawing for explaining how infrared light is emitted from the relay
wide-angle infrared radiation part 126 of the first relay 110. FIG.
[0047]
11 is a configuration diagram illustrating an outline of a configuration of a second relay 130. FIG.
[0048]
Explanation of sign
[0049]
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DESCRIPTION OF SYMBOLS 10 Cross talk room, 12 management rooms, 14 management
consoles, 20 indoor talk systems, 30 indoor talk terminals, 32 microphones, 34 headphones, 36
terminal side infrared radiation parts, 37 infrared radiation elements, 38 terminal side infrared
light reception parts, 39 infrared light receiving element, 40 terminal side transmission unit, 42
audio signal amplification circuit, 44 high frequency signal generation circuit, 46 frequency
modulation circuit, 50 terminal side reception unit, 52 high frequency amplification circuit, 54
audio demodulation circuit, 56 audio signal amplification circuit, DESCRIPTION OF SYMBOLS 60
management apparatus, 62 microphone, 63 speaker, 64 headphone, 66 apparatus side infrared
radiation part, 68 apparatus side infrared receiving part, 70 apparatus side transmission part, 72
audio signal amplification circuit, 74 high frequency signal generation circuit, 76 frequency
modulation circuit , 80 device-side reception unit, 82 audio demodulation circuit, 84 audio signal
amplifier circuit, 100 relay system, 11 0 first relay, 111 first relay unit, 112 wide-angle infrared
light receiving unit for 112 relay, 113 infrared light receiving element, 114 frequency converter,
116 infrared emitting unit for 116 relay, 121 second relay unit, 122 infrared light receiving unit
for relay, 123 infrared radiation element, 124 frequency converter, 126 wide-angle infrared
radiation unit for repeater, 130 second repeater, 131 first relay unit, 132 infrared receiver for
repeater, 134 frequency converter, infrared radiation unit for 136 repeater, 141 Second relay
unit, 142 infrared ray receiver for repeater, 144 frequency converter, 146 infrared ray emitter
for repeater.
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