JPH03209933A - Signal system for radiotelephony system - Google Patents

Abstract

PURPOSE:To prevent a user from hearing a control signal by adding a tone signal detecting circuit and a switching filter circuit to the radiotelephony system on a control signal reception side and disconnecting a channel in response to the detection of the tone signal detecting circuit. CONSTITUTION:The procedure up to the calling from an exchange 1 to a telephone set 13 is the same as before. When the telephone set 13 answers, a call signal generating and answer detecting circuit 12 detects that and generates a toner signal by using a signal sending circuit 9. This tone signal is detected by a signal detecting circuit 4 and a switching filter 5 is put in operation to disconnect a speech path. Then the circuit 12 uses a signal transmission/ reception circuit 10 to send an answer signal out. This signal passes through a two-line/four-line converting circuit 18 and radio equipments 7 and 6 and is received by a signal transmission/reception circuit 3. The circuit 3 operates an OD interface circuit 2 to sends an answer signal out to the exchange 1. Then the circuit 12 finishes generating the tone signal by the circuit 9. Consequently, the circuit 4 does not detect the tone signal any more and the filter 5 is put in operation to disconnect the speech path.

Description

[Detailed description of the invention] [Industrial application field] The present invention relates to a signaling system for a radio telephone device.

[Summary of the invention]

In radiotelephone equipment that uses a conventional single radio line,
Response, recovery, etc. signals use in-band signals, so
There was a problem in that the user could also hear the sound and it was unpleasant to the ears.

The present invention adds a tone signal generation circuit to the radio telephone device on the signal sending side, a tone signal detection circuit and a switch filter circuit to the radio telephone device on the signal receiving side, and generates a low frequency tone signal when transmitting an in-band signal. By transmitting the signals at the same time, the communication path on the signal receiving side is cut off, making it impossible for the user to hear the in-band signals.

[Conventional technology]

The configuration of a conventional wireless telephone device is shown in FIG. 1 is an exchange, 2 is an OD intern Ace that transmits and receives OD (out-of-band) signals from the exchange, 3 and 10 are signal transmitting and receiving circuits that transmit and receive selective call signals, 6 and 7 are single-line radios, and 8 is an exchange/radio 11 is a 2-4 wire conversion circuit that converts the 4-wire communication path of the machine into a 2-wire communication path of the telephone; 11 is a ring tone generating circuit for making the caller hear the ring tone when the telephone 13 is ringing; 12 is a ring tone generation circuit; A calling signal generation/response detection circuit 13 is a telephone for calling the telephone and detecting a response. here.

1 to 6 are the calling side, and 7 to 13 are the called side.

Next, the procedure for calling the telephone 13 from the exchange 1 will be described. When the OD interface 2 detects a call from the exchange 1, the signal transmitting/receiving circuit 3 is used to send a selective calling signal. This signal is received by the signal transmitting/receiving circuit 10 via the radios 6 and 7 and the 2-wire/4-wire conversion circuit 8. The signal transmitting/receiving circuit 10 operates a ringing tone generating circuit 11 to send a ringing tone to one calling party, and also operates a ringing signal generating/response detecting circuit 12 to ring the telephone 13. When the telephone 13 responds, the calling signal generation response detection circuit 12 detects it, and causes the signal transmission/reception circuit 10 to send out a response signal. This signal passes through the 2-wire/4-wire conversion circuit 8 and the radios 7 and 6.

The signal is received by the signal transmitting/receiving circuit 3. The signal transmitting/receiving circuit 3 operates the OD interface circuit 2 and sends a response signal to the exchange 1.

[Problem to be solved by the invention]

The above-mentioned prior art uses in-band signals for control signals such as calling, answering, restoring, etc., so there is a problem in that the signals can be heard by the user and become jarring.

The present invention aims to solve the above-mentioned problems. [Means for Solving the Problems] In order to achieve the above-mentioned objects, the present invention generates a tone signal in a wireless telephone device on the control signal sending side. circuit.

A tone signal detection circuit and a switch/filter circuit are added to the radio telephone device on the control signal receiving side, and when sending control signals,
Sends out a low frequency tone signal as well.

A tone signal is detected on the signal receiving side, and the detection signal operates a switch filter circuit to cut off the communication path on the signal receiving side.

[Effect]

As a result, control signals used for response, recovery, etc. can be made inaudible to the user.

〔Example〕

An embodiment of the present invention will be described below with reference to FIG. Switchboard 1. OD interface 2. Signal transmission/reception circuit 3. Radio 6. 7. 2-wire 4-wire conversion circuit 8° signal transmission/reception circuit 1
0. Ringing tone generation circuit 11. Calling signal generation/response detection circuit 12. Telephone] 3 is the same as the conventional one. 5 is a switch/filter circuit that disconnects the communication path when receiving the control signal and prevents the tone signal from being sent to the exchange; 4 is a signal detection circuit that detects the tone signal on the control signal receiving side;
9 is a signal sending circuit that sends out a tone signal.

Here, the procedure for calling the telephone 13 from the exchange 1 will be described. The process until the telephone 13 is called is the same as the conventional one. When the telephone 13 answers, the ringing signal generation/response detection circuit 1
2 detects and generates a tone signal using the signal sending circuit 9. This tone signal is detected by the signal detection circuit 4 and operates the switch filter 5 to disconnect the communication path.

Next, the calling signal generation/response detection circuit 12 uses the signal transmitting/receiving circuit 10 to transmit a response signal. This signal is 2
Line/l&! The signal is received by the signal transmitting/receiving circuit 3 via the conversion circuit 8 and the radio device 7°6. The signal transmitting/receiving circuit 3 operates the OD interface circuit 2 to cause the exchange 1 to send a response signal. Next, the ringing signal generation and response detection circuit 12 finishes generating the tone signal from the signal sending circuit 9. Therefore, the signal detection circuit 4 no longer detects the tone signal and operates the switch filter 5 to connect the communication path.

〔Effect of the invention〕

According to the present invention, a tone signal generation circuit is added to the radio telephone device on the control signal sending side, a tone signal detection circuit and a switch filter circuit are added to the radio telephone device on the control signal receiving side,
By simultaneously transmitting a 1 degree frequency tone signal when transmitting the control signal, the communication path on the signal receiving side is cut off, thereby preventing the user from hearing the control signal.

[Brief explanation of drawings]

FIG. 1 is a block diagram of an embodiment of the present invention, and FIG. 2 is a block diagram of a conventional example. l: exchange, 2: OD interface, 3: signal transmission/reception circuit, 4: signal detection circuit, 5: switch filter, 6:
Radio device, 7: Radio device, 8: 2-wire 4-wire conversion circuit, 9: Signal sending circuit, 10: Signal transmitting/receiving circuit, 11: Ringing tone generation circuit, 12: Ringing signal generation/response detection circuit, 13: Telephone set.

Claims (1)

[Claims] 1. Control signal transmission in wireless telephone equipment that connects a switch to one radio, a telephone to the other, connects both radios with a single radio line, and uses in-band signals for control signals. A tone signal generation circuit is added to the control signal receiving side, and a tone signal detection circuit and a switch filter circuit are added to the control signal receiving side. 1. A signal system for a wireless telephone device, characterized in that the control signal is made inaudible to the user by detecting the signal, driving the switch filter circuit, and cutting off the communication path.