JP2005079705A - Intercom - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an intercom which reliably calls from at least an entrance slave unit, even if it has a radio transmission section. <P>SOLUTION: A master unit 2 is connected wirelessly to an extended master unit 3 and comprises a 429 MHz transceiver circuit 29, a 420 MHz transmitter circuit 30, a 440 MHz receiver circuit 31 and a 2.4 GHz transmitter circuit 32. The extended master unit 3 comprises a 429 MHz transceiver circuit 45, a 420 MHz receiver circuit 46, a 440 MHz transmitter circuit 47 and a 2.4 GHz receiver 48 corresponding thereto. A calling signal from an entrance slave unit 1 is sent at 429 MHz to the extended master unit 3, and a sending voice signal from the master unit 3 is sent at 440 MHz to the entrance slave unit 1 via the master unit 2. A received voice signal from the entrance slave unit 1 is sent to the extended master unit 3 at 420 MHz from the master unit 2, and a picture signal is sent at 2.4 GHz from the master unit 2 to the extended master unit 3. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to an interphone device including an entrance child device and at least one master device, and more particularly to an interphone device including a camera and wirelessly transmitting a signal between at least one of the devices.

As a conventional intercom apparatus with a TV camera using radio, for example, there is a configuration shown in Patent Document 1. In this technique, the transmission frequency is not specifically shown. However, when a transmission signal includes a video signal having a large amount of information, in order to enable transmission, a high frequency such as an ISM band of 2.4 GHz band is used. Frequency radio waves are used, and in addition to video signals, audio signals and control signals are added to this frequency band for multiplex transmission.
JP 2000-224315 A

However, although the above frequency band is suitable for transmission of a large amount of information such as a video signal, when used in a home, attenuation and reflection by walls and human bodies are large, and the call signal from the entrance unit is good. In some cases, the call could not be received, the call could not be made, and the call voice and video were interrupted. In such a case, if the video is interrupted, it can be handled so as not to bother the visitor for the time being, but it may occur when the call is not made. In such a case, it is determined that the visitor is absent. So there was a problem.
Therefore, in view of such a problem, an object of the present invention is to provide an intercom apparatus that can reliably call at least an entrance cordless handset even if a wireless transmission section is provided.

The invention of claim 1 includes an entrance slave unit installed at the entrance, a master unit installed in the room, and an extension master unit, and a control signal including a call signal between the entrance slave unit, the master unit, and the extension master unit, Audio signals and video signals are transmitted and received, and the base unit and the extension base unit are wireless intercom devices, and the base unit has video with an arbitrary frequency of 2.4 GHz or higher as the center frequency. A high-frequency base unit transmission circuit that transmits a signal, a low-frequency base unit transmission circuit that transmits at least a control signal out of a control signal and an audio signal using radio waves of an arbitrary frequency of 200 MHz to 1 GHz, and an expansion And a low-frequency master receiver circuit that receives low-frequency radio waves transmitted from the master device to the entrance slave device or master device, and the additional master device is equipped with a high-frequency receiver that receives radio waves from the high-frequency master transmitter circuit. Receives radio waves from the frequency-increasing parent receiving circuit and the low-frequency main unit transmitting circuit To the low-pass up master receiver circuit, characterized in that a low-frequency increase parent transmitting circuit that transmits signals to the low-frequency base unit receiver circuits.
With this configuration, since the control signal is wirelessly transmitted from the master unit to the extension master unit at a low frequency of 1 GHz or less, the call signal from the entrance slave unit can be transmitted to the extension master unit without being greatly attenuated. Therefore, visitors can be reliably recognized even by the extension master unit. Further, if the audio signal is 1 GHz or less, the call between the entrance slave unit and the extension master unit will not be interrupted.

The invention of claim 2 includes an entrance slave unit installed at the entrance and a master unit installed indoors, and control signals, audio signals, and video signals including call signals can be transmitted and received between the entrance slave unit and the master unit. In a wireless interphone device between the entrance unit and the base unit, the entrance unit has a high frequency element that transmits a video signal with a center frequency of any one of 2.4 GHz or higher frequencies. From the main unit to the entrance sub unit, a low-frequency sub unit transmission circuit that transmits at least a control signal among control signals and audio signals using radio waves of an arbitrary frequency in the low frequency band of 200 MHz to 1 GHz A low-frequency child device receiving circuit for receiving a low-frequency radio wave to be transmitted, and the parent device includes a high-frequency parent device receiving circuit for receiving a radio wave from a high-frequency child device transmission circuit, and a low-frequency child device A low-frequency master receiver circuit that receives radio waves from the transmitter circuit, and a low-frequency sensor Characterized in that a low frequency base unit transmission circuit that transmits signals to the reception circuit.
According to this configuration, since the control signal is transmitted from the entrance slave unit to the master unit at a low frequency of 1 GHz or less, the call signal from the entrance slave unit can be transmitted to the master unit without being greatly attenuated. Recognize visitors with confidence. Also, if the audio signal is 1 GHz or less, the call between the entrance unit and the base unit will not be interrupted.

According to a third aspect of the present invention, in the first or second aspect of the present invention, the control signal is composed of a downlink control signal transmitted to the entrance unit and an uplink control signal transmitted from the entrance unit. The radio wave uses a single frequency different from the radio wave of the audio signal, and the uplink and downlink control signals are alternately transmitted in time.
According to this configuration, the control signal can be transmitted even during a call, and for example, a pan operation of the camera can be performed during the call.

According to a fourth aspect of the present invention, in the first or second aspect of the present invention, the audio signal and the control signal are time-division multiplexed at a single frequency.
According to this configuration, the transmission / reception circuit for the audio signal and the control signal can be shared, and the transmission / reception circuit can be reduced.

  The inventions of claim 5 and claim 6 use a PHS system having a frequency exceeding 1 GHz, for example, 1.9 GHz, by using a mobile phone device as a low frequency instead of the inventions of claims 1 and 2. Even in this case, since the signal is stable without having to be taken into consideration on the intercom device side, the call is not interrupted even through wireless communication.

As described above, according to the present invention, at least the control signal is wirelessly transmitted at a frequency of 1 GHz or less, which is difficult to attenuate even indoors. Can respond. That is, the call is surely made.
Further, if the transmission of the audio signal is set to 1 GHz or less as in the case of the control signal, the call will not be interrupted even through the radio.

(First embodiment)
DESCRIPTION OF EXEMPLARY EMBODIMENTS Hereinafter, embodiments of the invention will be described in detail with reference to the drawings. 1 and 2 show a first embodiment of an intercom apparatus according to the present invention, FIG. 1 is a schematic configuration diagram, and FIG. 2 is a circuit block diagram. In the figure, 1 is an entrance slave unit installed at the entrance, 2 is a master unit installed in the residence, and 3 is an extension master unit having substantially the same function as the master unit. And the main | base station 1 and the main | base station 2 are connected by the signal wire | line 4, and the main | base station 2 and the expansion main | base station 3 are wirelessly connected. In FIG. 1, f0 is a control signal, f1 is an audio transmission signal, f2 is an audio reception signal, and f3 is a frequency of the video signal. As will be described later, here, f0 = 429 MHz, f1 = 420 MHz, f2 = 440 MHz, f3 = 2.4 GHz.

  The front cordless handset 1 includes a call button 11, a microphone 12, a speaker 13, and a camera 14, and includes a handset CPU 15 that controls each circuit, a handset microphone amplifier 16 that amplifies a microphone signal, and a signal to the speaker. A handset speaker amplifier 17, a video transmission circuit 18 for modulating and transmitting a video signal from the camera 14, and a handset mixing circuit 19 for sending each signal to the signal line 4 are provided. 4 is connected.

  The base unit 2 includes a handset 21a, a speaker 22a, a television monitor 23a, and an antenna 35. The base unit mixing circuit 24 and the base unit 2 are connected to the signal line 4 and mix signals to be transmitted to the entrance unit 1. Control is performed by a master CPU 25 to be controlled, a voice receiving circuit 26 that receives a voice signal from the front door 1, a voice transmission circuit 27 that sends a voice signal to the front handset, a video receiving circuit 28 that receives a video signal, and 429 MHz. 429 MHz transmission / reception circuit 29 as one of the low-frequency master transmission circuit and low-frequency master reception circuit for transmitting and receiving signals, 420 MHz transmission as one of the low-frequency master transmission circuits for modulating and transmitting the audio signal at 420 MHz Circuit 30, 440 MHz receiving circuit 31 as one of the low-frequency base unit receiving circuits that receive and demodulate the audio signal of 440 MHz, and antenna 33 are connected to 2.4 GHz. 2.4 GHz transmission circuit 32 as a high-frequency base unit transmission circuit for transmitting a video signal, a base unit distributor 34 that is connected to an antenna 35 to mix transmission signals or distribute reception signals, a receiver amplifier 37a, a microphone An amplifier 38a, a speaker amplifier 39a, and a video circuit 40a for demodulating the video signal and causing the television monitor 23a to output an image are provided.

  The extension base unit 3 includes a handset 21b, a speaker 22b, a television monitor 23b, and an antenna 43, similar to the base unit 2, and an parent unit / distributor 42 that distributes received signals or mixes transmission signals by connecting the antenna 43 therein, The master CPU 44 for controlling the extension master unit 3 receives and demodulates the 429 MHz transmitter / receiver circuit 45 and 420 MHz audio signal as one of the low-frequency master receiver circuit and the low-frequency master transmitter circuit for transmitting and receiving the control signal at 429 MHz. A 420 MHz receiving circuit 46 as one of the low frequency band increasing receiver circuits, a 440 MHz transmitting circuit 47 as one of the low frequency band increasing transmitting circuits for modulating and transmitting the audio signal at 440 MHz, and the antenna 49 are connected. A 2.4 GHz receiving circuit 48, a receiver amplifier 37b, a microphone amplifier 38b, and a high frequency band receiving circuit for receiving signals. And a video circuit 40b for bounded out by demodulating the video signal.

Next, the operation of this intercom apparatus will be described. When the call button 11 of the entrance cordless handset 1 is pressed by a visitor, the handset CPU 15 detects the call and outputs a call signal, which is an uplink control signal, to the master unit 2 and simultaneously turns on the camera 14 to display the image. The signal is output to the main unit 2. In response to the calling signal transmitted to the parent device 2, the parent device CPU 25 operates to report the calling sound from the speaker 22a and causes the transmitted video signal to be output from the television monitor 23a. In addition, a call signal is wirelessly transmitted to the additional base unit 3 via the 429 MHz transmission / reception circuit 29, and a video signal is wirelessly transmitted at 2.4 GHz.
The extension master unit 3 receives the call signal by the 429 MHz transmission / reception circuit 45, and the extension master CPU 44 performs an operation of reporting the ring tone from the speaker 22b. At the same time, the 2.4 GHz receiving circuit 48 receives the video signal and outputs it to the television monitor 23b.

When receiving the ringing tone and responding from the extension master unit 3, it is sufficient to pick up the handset 21b of the extension master unit 3, so that the receiver amplifier 37b and the microphone amplifier 38b are turned on, and the master CPU 44 is A line connection signal, which is a downlink control signal, is output toward the slave unit 1, and the call circuit between the entrance slave unit 1 and the extension master unit 3 is connected. The line connection signal is transmitted to the entrance unit 1 via the 429 MHz transmission / reception circuit 45, and the microphone 12 and the speaker 13 of the entrance unit 1 are turned on in response to this signal. The uplink control signal and downlink control signal transmitted at the same frequency of 429 MHz are time-divisionally transmitted alternately.
Thus, the resident's transmitted voice is wirelessly transmitted to the base unit 2 via the microphone of the handset 21 b and the 440 MHz transmission circuit 47. The 440 MHz receiving circuit 31 of the parent device 2 receives the signal and further transmits the signal from the parent device 2 to the entrance child device 1 via the signal line 4.
In response to this transmitted voice, the incoming voice of the visitor is wirelessly transmitted from the entrance terminal 1 to the additional base unit 3 via the voice receiving circuit 26 of the base unit 2 and the 420 MHz transmission circuit 30. The 420 MHz receiving circuit 46 of the extension base unit 3 receives the signal and outputs it to the receiver of the handset 21b via the receiver amplifier 37b, and a call is made.
In this line connection state, when the handset 21b is returned to a predetermined position, a line disconnection signal is transmitted as a downlink control signal from the extension master unit 3 to the front cordless handset 1, and the communication path is disconnected.

  On the other hand, when the base unit 2 responds to the ringing sound from the front door unit 1, the handset 21a of the base unit 2 may be picked up without picking up the handset 21b of the additional base unit 3. As a result, the receiver amplifier 37a and the microphone amplifier 38a are turned on, and the master unit CPU 25 outputs a line connection signal as a downlink control signal to the entrance unit 1, so that the call between the entrance unit 1 and the base unit 2 can be performed. The circuit is connected and a call is possible.

FIG. 3 is a frequency spectrum illustrating each radio signal frequency in the above-described configuration. As illustrated, the audio signal and the control signal are transmitted at a low frequency of 420 MHz to 440 MHz, and a high frequency centered on 2.4 GHz. A video signal is being transmitted at a frequency.
In this way, since control signals and audio signals other than video signals are transmitted wirelessly at a low frequency, the call signal from the entrance slave unit can be transmitted to the extension master unit without being greatly attenuated. Visitors can be recognized with confidence. In addition, the voice signal is not greatly attenuated, and a good call can be made. In addition, the control signal and the audio signal are independently transmitted as different frequencies, so that the control signal can be transmitted even during a call. For example, a TV camera can be panned or tilted during a call, and a visitor can be reliably photographed. It becomes easy.

In addition, if it is 500 MHz or less as a low frequency, it can transmit satisfactorily even if it is indoors, but if it exceeds 500 MHz, if it is 1 GHz or less, the amount of attenuation is suppressed compared with the ISM band. Can be preferred. Further, if it is 200 MHz or less, it may affect other peripheral wireless devices, so it is preferable to set it to 200 MHz or more.
In addition, although the audio signal and the control signal are transmitted separately, the downlink control signal may be superimposed on the received voice signal and the uplink control signal may be superimposed on the transmitted voice signal. Further, the frequency may not be the above frequency. For example, the downstream frequency may be 250 MHz band, 410 MHz band, the upstream frequency may be 380 MHz band, 450 MHz band, or the frequency of upstream and downstream radio waves may be reversed. Further, the video signal may be transmitted at a frequency of, for example, 5 GHz band.

(Second Embodiment)
4 and 5 show a second embodiment of an intercom apparatus according to the present invention, FIG. 4 is a configuration diagram, and FIG. 5 is a circuit block diagram. Here, transmission of signals between the entrance slave unit 1 and the master unit 2 is performed wirelessly, and the frequencies of the control signal f0, the voice transmission signal f1, the voice reception signal f2, and the video signal f3 are the above-described first frequencies. The frequency is the same as that of the embodiment. In addition, the same code | symbol is provided to the component same as the said FIG. 2, and description is abbreviate | omitted.
As shown in FIG. 5, the front cordless handset 1 modulates an audio signal with a 429 MHz transmission / reception circuit 51, 420 MHz as one of a low frequency handset transmission circuit and a low frequency handset reception circuit that transmits and receives control signals at 429 MHz. 420 MHz transmission circuit 52 as one of the low-frequency child device transmission circuits that transmit and 440 MHz reception circuit 53 as one of the low-frequency child device reception circuits that receive and demodulate the audio signal of 440 MHz are provided. Is connected to an antenna 55 through a slave distributor 54. In addition, a 2.4 GHz transmission circuit 56 is provided as a high frequency slave transmission circuit that transmits a video signal at 2.4 GHz, and an antenna 57 is connected thereto.

  The base unit 2 includes a base unit distributor 60 to which an antenna 59 is connected, a base unit CPU 61 that controls the base unit 2, and a low frequency base unit reception circuit that transmits and receives control signals and a low frequency base unit transmission circuit. One of the 429 MHz transmission / reception circuit 62 and one of the low frequency master transmission circuits that transmit the audio signal at 420 MHz reception circuit 63 and 440 MHz as one of the low frequency master reception circuits that receive and demodulate the 420 MHz audio signal. A 2.4 GHz receiving circuit 65 is provided as a high frequency master receiving circuit that receives a video signal and includes a 440 MHz transmitting circuit 64 and an antenna 66. As described above, the master unit 2 has the same configuration as the extension master unit shown in FIG.

This intercom apparatus operates as follows. When the call button 11 is operated by the visitor, the slave CPU 15 detects this and outputs a call signal that is a control signal. This calling signal is wirelessly transmitted to base unit 2 at 429 MHz. At the same time, the slave CPU 15 turns on the camera 14 and wirelessly transmits the video signal to the master 2 at 2.4 GHz.
When the base unit 2 receives the calling signal, the base unit CPU 61 outputs a ringing sound from the speaker 22a, and performs an image output operation on the video signal transmitted from the television monitor 23a. When the resident picks up the handset 21a in response to the ringing tone, the receiver amplifier 37a and the microphone amplifier 38a are turned on, and a line connection signal is output to the entrance terminal 1 as a down control signal. Are connected to the call circuit of the base unit 2. The line connection signal is transmitted to the entrance unit 1 via the 429 MHz transmission / reception circuit 62, and the microphone 12 and the speaker 13 of the entrance unit 1 are turned on in response to this signal.
Thus, the voice of the resident is wirelessly transmitted from the handset 21a to the entrance terminal 1 via the 440 MHz transmission circuit 64, and the voice of the visitor is received from the entrance terminal 1 by the 420 MHz reception circuit 63 of the base unit 2. Then, it is output to the handset 21a via the receiver amplifier 37a, and a call is carried out.

  In this way, the entrance unit and the base unit may be wireless, and the transmission of the control signal and the call signal is set to 200 MHz to 1 GHz, so that the signal is not greatly attenuated and the call is surely made. Good call.

(Third embodiment)
FIG. 6 shows a third embodiment of the present invention. The intercom apparatus of this embodiment is composed of an entrance slave unit 1, a master unit 2, and an extension master unit 3 as in FIG. 1, and the entrance slave unit 1 has the same circuit configuration as in FIG. Only the circuit block diagram of the parent device 2 and the extension parent device 3 is shown with the entrance child device 1 omitted. However, the control signal frequency f0, the voice transmission signal frequency f1 and the voice reception signal frequency f2 are the same, 429 MHz, the video signal frequency f3 is 2.4 GHz, and the frequency spectrum shown in FIG. Sending in. Note that the same circuit blocks as those in FIG.

As shown in FIG. 6, the parent device 2 includes an A / D conversion circuit 71, a D / A conversion circuit 72, and a parent device that assembles a signal array for time-division multiplexing transmission of digitized control signals and audio signals. A first array circuit 73, a master unit second array circuit 74 that returns a signal array, a 429 MHz transmission circuit 75 as a low-frequency base unit transmission circuit, and a 429 MHz reception circuit 76 as a low-frequency base unit reception circuit are provided.
Further, the extension base unit 3 includes a 429 MHz reception circuit 81 as a low frequency band increase reception circuit, a 429 MHz transmission circuit 82 as a low frequency band increase transmission circuit, and a boost number that returns a signal arrangement of received control signals and audio signals. 1 array circuit 83, a second parent array circuit 84 for assembling a signal array for time division multiplexing transmission of digitized control signals and audio signals, a D / A conversion circuit 85, and an A / D conversion circuit 86 are provided. ing.

This intercom apparatus operates as follows. When a call is made from the entrance device 1 and a call signal and a video signal are transmitted to the parent device 2, the parent CPU 25 that has detected the call signal causes the speaker 22a to output a ringing tone. Then, the transmitted video signal is output from the television monitor 23a. Furthermore, the temporal arrangement of the call signals is assembled so that multiplex transmission is possible, and the call signals are wirelessly transmitted to the extension master unit 3 at 429 MHz. At the same time, the video signal is wirelessly transmitted at 2.4 GHz.
When the extension master unit 3 receives the signal transmitted from the master unit 2, the extension master CPU 44 returns the signal arrangement and causes the speaker 22b to output a ringing tone. At the same time, the received video signal is output from the television monitor 23b.

If the handset 21b of the extension base unit 3 is picked up in response to this ringing tone, the base extension CPU 44 outputs a line connection signal, which is a downlink control signal, to the entrance slave unit 1, and the entrance slave unit 1 and the extension master unit 3 Is connected to the communication circuit. Specifically, the line connection signal output from the parent CPU 44 is assembled in a temporal arrangement so that multiplex transmission is possible, and transmitted to the parent device 2 at 429 MHz. When receiving this signal, the base unit 2 returns the signal arrangement and retransmits the signal to the front door unit 1 via the signal line 4.
The entrance unit 1 receives this signal, the microphone and the speaker are turned on, the resident's transmitted voice is similarly A / D converted and the temporal arrangement is assembled, and then the control signal and It is transmitted to the main unit 2 at the same 429 MHz, and after the arrangement is returned by the main unit 2, it is D / A converted and transmitted to the entrance unit 1. In this way, the transmitted voice is output from the speaker of the front door 1.

On the other hand, the reception voice from the entrance slave unit 1 is A / D converted by the master unit 2, and then the array is assembled and wirelessly transmitted to the extension master unit 3 at the same 429 MHz as the control signal.
In the extension master unit 3, the received voice signal array is returned and D / A converted and output from the receiver of the handset 21b to make a call. In this call-enabled state, when the handset 21b is returned to a predetermined position, a communication path disconnection signal, which is a control signal, is transmitted from the extension master unit 3 to the front door unit 1, and the communication path is disconnected. When the base unit 2 responds to a call from the front door unit 1, the handset 21a of the base unit 2 may be picked up without taking the handset 21b of the expansion base unit 3.
FIG. 7 is a frequency spectrum illustrating each radio signal frequency in this configuration. As illustrated, a control signal and an audio signal are transmitted at the same low frequency of 429 MHz, and a high frequency centered on 2.4 GHz. A video signal is being transmitted at a frequency.

  In this way, by setting the control signal and the voice signal to the same frequency of 1 GHz or less, the control signal and the voice signal are not greatly attenuated as in the above-described embodiment, and a favorable call and call can be performed. The control signal and the audio signal are time-division multiplexed at the same frequency, so that the audio signal and the control signal transmission / reception circuit can be made common, and the transmission / reception circuit can be reduced as compared with the first embodiment. Since the transmission / reception circuit requires a wider space than other circuits, the reduction can be effective in reducing the size of the apparatus.

In any of the above embodiments, the wireless communication method and protocol are not defined, and any communication method can be generally applied. The device can be used. In this case, since the communication stability is guaranteed by the communication carrier, even when the low frequency is raised to nearly 2 GHz, the call is surely made and a good call can be made.
In addition, both the control signal and the audio signal are separated from the video signal and transmitted at a low frequency, but if at least the control signal is transmitted at a frequency of 1 GHz or less, at least the extension master unit is called, The resident can respond to the call operation of the visitor with certainty, and the visitor is not mistaken for the absence, which is effective.

It is a block diagram of 1st Embodiment of the intercom apparatus which concerns on this invention. FIG. 2 is a circuit block diagram of FIG. 1. 3 is a frequency spectrum of the radio signal in FIG. 2. It is a block diagram of 2nd Embodiment of the intercom apparatus which concerns on this invention. FIG. 5 is a circuit block diagram of FIG. 4. It is a circuit block diagram of a 3rd embodiment of the present invention. It is a frequency spectrum of the radio signal of FIG.

Explanation of symbols

1 .. Entrance slave unit, 2 .... Master unit, 3. Extension base unit, 4. Signal line, 29..429MHz transmission / reception circuit (low-frequency base unit transmission circuit and low-frequency base unit reception circuit), 30. 420 MHz transmission circuit (low-band base unit transmission circuit), 31-440 MHz reception circuit (low-band base unit reception circuit), 32, 2.4 GHz transmission circuit (high-band base unit transmission circuit), 33, 35, Antenna, 45..429 MHz transmission / reception circuit (low frequency band increase transmission circuit and low frequency band increase reception circuit), 46..420 MHz reception circuit (low frequency band increase reception circuit), 47..440 MHz transmission circuit (low frequency band increase parent) Transmitter circuit), 48 ··· 2.4 GHz receiver circuit (high frequency band receiver circuit), 43, 49 ·· antenna, 51 ·· 429 MHz transmitter / receiver circuit (low frequency slave device transmitter circuit and low frequency slave device receiver circuit), 52 ・ ・ 420MHz transmission circuit ), 53..440 MHz receiver circuit (low band slave unit receiver circuit), 55..antenna, 56..2.4 GHz transmitter circuit (high band slave unit transmitter circuit), 62..429 MHz transceiver circuit (low band master unit) Transmission circuit and low-frequency base unit reception circuit), 63 ·· 420 MHz reception circuit (low-frequency base unit reception circuit), 64 ·· 440 MHz transmission circuit (low-frequency base unit transmission circuit), 65 ·· 2.4 GHz reception circuit ( High-frequency base unit receiving circuit), 66 .. Antenna, 73 .. Base unit first array circuit, 74 .. Base unit second array circuit, 75 .. 429 MHz transmission circuit (low-band base unit transmission circuit), 76. 429 MHz receiver circuit (low frequency master receiver circuit), 81... 429 MHz receiver circuit (low frequency boost receiver circuit), 82... 429 MHz transmitter circuit (low frequency boost transmitter circuit), 83. Array circuit, 84 .. Increasing parent second array circuit

Claims (6)

Provided with an entrance slave unit installed at the entrance, a master unit installed in the room, and an extension master unit. Between the entrance slave unit, the master unit, and the extension master unit, a control signal including a calling signal, an audio signal, and an image Signals are transmitted and received, and in the wireless intercom device between the master unit and the extension master unit,
The base unit includes a high-frequency base unit transmission circuit that transmits the video signal with an arbitrary high frequency of 2.4 GHz or higher as a center frequency, and a radio wave having an arbitrary frequency of a low frequency of 200 MHz to 1 GHz. A low-frequency base unit transmission circuit that transmits at least the control signal among the control signal and the audio signal, and the low-frequency radio wave transmitted from the additional base unit to the entrance slave unit or the base unit With a low frequency master receiver circuit,
In the extension master unit, a high-frequency boost receiver circuit that receives radio waves from the high-frequency master phone transmission circuit, a low-frequency boost receiver circuit that receives radio waves from the low-frequency master phone transmission circuit, and An intercom apparatus comprising: a low-frequency increase parent transmission circuit that transmits radio waves to a low-frequency parent device reception circuit. An entrance cordless handset installed at the entrance, and a base phone installed indoors, the control signal including the calling signal, the audio signal, and the video signal are transmitted and received between the entrance cordless handset and the base phone. In the wireless intercom device between the machine and the parent machine,
The entrance cordless handset has a high frequency cordless handset transmission circuit that transmits the video signal with a center frequency of any one of 2.4 GHz or higher high frequency, and an arbitrary frequency in a low frequency band of 200 MHz to 1 GHz. A low-frequency child device transmission circuit that transmits at least a control signal among the control signal and the audio signal using a radio wave, and a low frequency region that receives the low-frequency radio wave transmitted from the parent device to the entrance child device With a slave receiver circuit,
The master unit includes a high-frequency master receiver circuit that receives radio waves from the high-frequency slave device transmitter circuit, a low-frequency master receiver circuit that receives radio waves from the low-frequency slave device transmitter circuit, and the low-frequency master device receiver circuit. An intercom apparatus comprising a low-frequency base unit transmission circuit that transmits radio waves to a local unit reception circuit. The control signal is composed of a downlink control signal transmitted to the entrance cordless handset and an uplink control signal transmitted from the entrance cordless handset, and the radio waves of both control signals have a single frequency different from that of the voice signal. The intercom apparatus according to claim 1 or 2, wherein the intercom apparatus is used and alternately transmits the uplink and downlink control signals in terms of time. The intercom apparatus according to claim 1 or 2, wherein the audio signal and the control signal are time-division multiplexed at a single frequency. Provided with an entrance slave unit installed at the entrance, a master unit installed in the room, and an extension master unit. Between the entrance slave unit, the master unit, and the extension master unit, a control signal including a calling signal, an audio signal, and an image Signals are transmitted and received, and in the wireless intercom device between the master unit and the extension master unit,
The base unit includes a high-frequency base unit transmitting circuit that transmits the video signal with a center frequency of any one of the high-frequency frequencies of 2.4 GHz or higher, and the control signal and voice using radio waves of a mobile phone device. A low-frequency base unit transmission circuit that transmits at least a control signal among signals, and a low-frequency base unit reception circuit that receives radio waves of the low-frequency transmitted from the additional base unit to the entrance slave unit or the base unit Prepared,
In the extension master unit, a high-frequency boost receiver circuit that receives radio waves from the high-frequency master phone transmission circuit, a low-frequency boost receiver circuit that receives radio waves from the low-frequency master phone transmission circuit, and An intercom apparatus comprising: a low-frequency increase parent transmission circuit that transmits radio waves to a low-frequency parent device reception circuit. An entrance cordless handset installed at the entrance, and a base phone installed indoors, the control signal including the calling signal, the audio signal, and the video signal are transmitted and received between the entrance cordless handset and the base phone. In the wireless intercom device between the machine and the parent machine,
The entrance cordless handset has a high frequency cordless handset transmission circuit for transmitting the video signal with a center frequency of any one of the high frequency frequencies of 2.4 GHz or higher, and the control signal using radio waves of a mobile phone device, A low-frequency child device transmission circuit that transmits at least a control signal among audio signals, and a low-frequency child device reception circuit that receives radio waves of the low frequency transmitted from the parent device to the entrance child device,
The master unit includes a high-frequency master receiver circuit that receives radio waves from the high-frequency slave device transmitter circuit, a low-frequency master receiver circuit that receives radio waves from the low-frequency slave device transmitter circuit, and the low-frequency master device receiver circuit. An intercom apparatus comprising a low-frequency base unit transmission circuit that transmits radio waves to a local unit reception circuit.

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