JPH0646109Y2 - Wireless communication system - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a wireless communication system for performing a call and data transmission using a call radio.

[Prior Art] There is known a wireless communication system in which a microphone and a facsimile device are connected to a wireless device for a call through an interface device to perform a call and a facsimile communication.

The interface device connects the wireless device and the microphone during a call, while connecting the wireless device and the facsimile device during the facsimile communication and adjusts the level and impedance of the facsimile signal transmitted and received between the wireless device and the facsimile device. Arranged for alignment.

In such a wireless communication system, an audio signal is often extracted from an earphone jack of a wireless device and input to an interface device.

Normally, in a wireless device, when a plug is inserted into an earphone jack, the built-in speaker is disconnected, and sound from the speaker is stopped.

Therefore, conventionally, a speaker is arranged on the interface device side, and the operator listens to the received voice from the partner station through the speaker.

However, in this case, when facsimile communication is started,
The signal sound of various data signals is emitted from the speaker.
Or, there was a problem that it was output as a noise of "Za" and was annoying to the operator.

[Object] An object of the present invention is to solve the above problems and provide a wireless communication system in which a data signal is not output as noise.

[Structure] For this purpose, the present invention detects a period during which the data transmission device is in communication and is receiving a carrier signal for data transmission, and stops the reception sound of the speaker during the period. It is characterized by doing so.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

FIG. 1 is a block diagram of a wireless communication system according to an embodiment of the present invention. In the figure, a microphone 3, a facsimile device 4, and a speaker 5 are connected to a telephone transceiver 1 via an interface device 2. For connection between the wireless device 1 and the interface device 2, a microphone connection connector 1a on the wireless device 1 side and an earphone jack 1b are used.

In the facsimile apparatus 4, the scanner 41 reads a document image and extracts image information of a predetermined resolution, and the plotter 42 records the image information on recording paper. The coding / decoding unit 43 performs coding of transmitted image information and decoding of received image information.

The modem 44 has a low-speed modem function of transmitting various procedure signals in the transmission control procedure and a high-speed modem function of modulating and demodulating and transmitting image information, and transmits a predetermined facsimile signal. The communication control unit 45 executes facsimile transmission according to a predetermined transmission control procedure via the modem 44.

The operation display unit 46 is for performing various operations for causing the facsimile apparatus to execute a predetermined transmission / reception process.
The system control unit 47 is composed of a microcomputer system, and controls each of the above units to execute a predetermined operation of the facsimile apparatus.

The transmission signal FTX output from the modem 44 is input to the transmission signal circuit 21 in the interface device 2, and the output of the transmission signal circuit 21 is input to the switching circuit 22. Also,
The transmission / reception switching signal CNT output from the system control unit 47 is
It is input to the switching circuit 23. The output of the switching circuit 22 is the transmission signal CTX, and the output of the switching circuit 23 is the press talk signal CPT.
Is input to the wireless device 1 via.

Further, the switching circuit 22 receives the voice signal MTX from the microphone 3, and the switching circuit 23 receives the press talk signal MPT from the microphone 3.

The reception signal CRX of the wireless device 1 is taken out from the earphone jack 1b and input to the reception signal circuit 24, and its line is connected to the break contact a of the switch section of the relay 25. The output of the reception signal circuit 24 is the reception signal FRX.
Has been entered into the modem 44 as.

One line of the speaker 5 is connected to the terminal b of the switch section of the relay 25, and the other line of the speaker 5 is grounded. Also, one end of the winding of the relay 25 is connected to the power source Vc.
The line of the speaker control signal SPC from the system control unit 47 is connected to the other end. The ground line GND of the wireless device 1 is the earphone jack 1
It is pulled out from b and is grounded to the interface device 2 and the facsimile device 4.

In the above circuit, the switching circuits 22 and 23 switch whether to connect the microphone 3 side or the facsimile apparatus 4 side to the wireless device 1. The transmission signal circuits 21 and 24 perform impedance matching between the radio device 1 side and the facsimile device 4 side, signal level adjustment, noise removal, and the like. In addition, the relay 25 uses the speaker 5 according to the speaker control signal SPC output from the system controller 47.
It turns the connection on and off.

In the wireless communication system of the present embodiment having the above configuration, when making a wireless call, the operator switches the switching circuits 22 and 23 to the microphone 3 side and operates the wireless device 1 and the microphone 3 to call the partner station. .

By the above switching, the audio signal MTX from the microphone 3 is input to the wireless device 1 as the transmission signal CTX, and the press talk signal MPT is input to the wireless device 1 as the press talk signal CPT.

By the way, FIG. 2 shows the on / off control of the speaker 5. When the facsimile device 4 is not executing facsimile communication (N in step 101), the system control unit 47 turns off the speaker control signal SPC. ing. As a result, the relay 25 is not energized, and at this time, the relay 25
The contact a and the terminal b are connected to each other, and the reception signal CR of the radio device 1 is received.
The X line and the speaker 5 are connected (process 102).

As a result, when the operator presses the press talk switch (not shown) of the microphone 3 to the partner station, the press talk signal MPT causes the wireless device 1 to enter the transmission state, and voice can be transmitted. When the press talk switch is spoken, a reception state is set and the voice of the partner station can be received from the speaker 5.

Next, when performing facsimile communication, the operator
After meeting with the partner station by the wireless call, the switching circuits 22 and 23 are switched to the side of the facsimile apparatus 4, and the facsimile apparatus 4 performs a predetermined starting operation.

Transmission signal output from the modem 44 by the above switching
The FTX is input to the wireless device 1 as the transmission signal CTX via the transmission signal circuit 21 and the switching circuit 22, and the transmission / reception switching signal CNT output from the system control unit 47 is the switching circuit 23.
Via the wireless LAN 1 as a press talk signal CPT.

The transmission / reception switching signal CNT is a signal for switching the transmission state and the reception state of the wireless device 1.

When the above-mentioned start-up operation is performed, the facsimile device 4
A predetermined facsimile communication is started by transmitting and receiving various signals. That is, the facsimile apparatus 4 switches the wireless device 1 to the receiving state by the transmission / reception switching signal CNT when receiving the signal, and receives the reception signal CRX from the partner station.
The received signal FRX is received by the modem 44 via the received signal circuit 24.
To receive as. When transmitting a signal, the wireless device 1 is switched to the transmitting state, and the transmission signal FTX is input to the wireless device 1 and transmitted to the partner station.

When the facsimile communication is started (see FIG. 2, process 10).
1), the system control unit 47 determines the internal state of the modem 44. The modem 44 is a low speed modem or a high speed modem.
Data is transmitted using a predetermined carrier signal, and carrier detection is performed when the signal is received.

The system control unit 47 determines whether or not the modem 44 detects the carrier (process 103), and when the carrier is not detected (N in process 103), turns off the speaker control signal SPC in the same manner as described above, While connecting the speaker 5 (Processing 10
2) During carrier detection (Y in process 103), the speaker control signal SPC is turned on to disconnect the speaker 5 (process 104).

As a result, the reception sound from the speaker 5 is stopped while the facsimile device 4 is receiving various signals.

As described above, in the present embodiment, during the period when the facsimile device 4 is communicating and receiving the carrier signal,
The reception sound of the speaker 5 is stopped.

As a result, during facsimile communication, the facsimile signal will not be output as noise such as "pee" or "za".

In the above embodiment, whether or not the received signal is the carrier signal is determined inside the facsimile device 4, but the determination circuit may be disposed inside the interface device 2. is there. Further, although the reception sound from the speaker is stopped when the carrier is detected, the reception sound may be stopped when the facsimile device 4 is operated for transmission and reception.

Further, although the speaker 5 is externally attached to the interface device 2, it goes without saying that it may be built in the interface device 2.

Furthermore, although the communication system for performing facsimile communication has been described in the above embodiments, the present invention is not limited to the facsimile device and can be similarly applied to various data transmission devices for transmitting data in a voice band using a modem. Needless to say.

[Effect] As described above, according to the present invention, the sound received by the speaker is stopped while the data transmission device is communicating and is receiving the carrier signal for data transmission. , The data signal is no longer output as noise.

[Brief description of drawings]

FIG. 1 is a block diagram of a wireless communication system according to an embodiment of the present invention, and FIG. 2 is a flow chart showing control of a speaker. DESCRIPTION OF SYMBOLS 1 ... Radio | wireless machine, 1a ... Connector for microphone connection, 1b ... Earphone jack, 2 ... Interface device, 3 ... Microphone, 4
... Facsimile device, 5 ... Speaker, 21 ... Transmission signal circuit, 22,23 ... Switching circuit, 24 ... Reception signal circuit, 25 ... Relay, 41 ... Scanner, 42 ... Plotter, 43 ... Encoding / decoding unit, 44 ... Modem , 45 ... Communication control unit, 46 ... Operation display unit, 47
… System control unit.

Claims (1)

[Scope of utility model registration request] 1. A wireless system comprising a microphone and a speaker, which switches between transmitting and receiving and uses, and data transmission which is connected to the wireless system and performs data transmission using a carrier signal in a voice band via the wireless system. In a wireless communication system comprising a device and selectively performing voice communication and data transmission, carrier detection means for detecting the presence or absence of the carrier signal during communication by the data transmission device, and a speaker for controlling on / off of driving of the speaker Radio communication comprising drive means and reception sound stop means for turning off the speaker drive means and stopping output of reception sound from the speaker when the carrier detection means detects the carrier signal. system.