JP2000278723A - Radiotelephony system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a radiotelephony system by which an illegal DTMF signal through digital coding is interrupted in the case of transmitting the DTMF signal so as to transmit a correct DTMF signal to a speech opposite party. SOLUTION: This radiotelephony system 1 has a radiotelephony base station 109 connected to an exchange 20 and radiotelephony terminals 50, 60 that are placed between the radiotelephony base station 10 and telephone sets 50a, 60a to transmit/receive a radio signal to/from the radiotelephony base station 10. In order to correctly deliver a DTMF signal from the telephone sets 50a, 60a during a speech to a speech opposite party, the radiotelephony terminals 50, 60 detect a dial input, convert it into dial tone information and transmits the converted information to the radiotelephony base station 10, and the radiotelephony base station 10 reproduces the DTMF signal by the dial tone information into an analog signal on an analog line. Since the DTMF signal from the telephone set is not digitally coded and transmitted, the telephone set connected to the radiotelephony terminals 50, 60 can transmit a correct analog DTMF signal to the opposite party.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a radio telephone system, and more particularly to a radio telephone base station connected to an exchange, a radio telephone base station and a telephone set, and a radio signal transmitted from the radio telephone base station to the telephone. A wireless telephone system having a wireless telephone terminal for exchanging and transmitting the information.

[0002]

2. Description of the Related Art FIG. 5 is a configuration diagram of a conventional radio telephone system, FIG. 6 is a block diagram showing a configuration of a radio telephone terminal of FIG. 5, and FIG. 7 shows a configuration of a radio telephone base station of FIG. It is a block diagram. In this wireless telephone system, a wireless telephone base station 110 connected to the exchange 20 is disposed between the wireless telephone base station 110 and the telephone sets 50a and 60a.
It has wireless telephone terminals 150 and 160 that exchange signals with the wireless telephone base station 110 by radio. The telephones 41, 42, 43 and the PBX 30 are connected to the exchange 20 by wire, and the PBX 30 accommodates the telephones 31, 32, 33, 34. In this case, when an analog line is used to receive a push line service using a tone signal to call the extension of the other party, for example, the telephone 31, from the general telephone, for example, the telephone 41, dial input on the telephone 41 is performed. D caused by
When the TMF is transmitted to the other party as analog voice, the DTMF receiver on the other party detects the TMF and the service is realized.

[0003]

In the case of a wireless telephone terminal of a digital system other than the case where the above-described conventional analog line is used to receive the push line service, for example, in the case of the wireless telephone terminal 150, the push by the DTMF from the telephone 50a is performed. It is difficult to receive line service for the reasons described below. As shown in FIG. 6, the DTMF from the telephone 50a is input to the wireless telephone terminal 150 via the modular cable 50b, and under the control of the control unit 154, like the voice, the SLIC unit 51 and the CODEC unit 5.
2 and A / D conversion and digital encoding by the audio encoding unit 53, and as an encoded signal from the radio unit 55 to the antenna 5
6 is transmitted.

[0004] The transmitted coded signal is received by the radio telephone base station 110 via the antenna 11 and the radio section 12, and the digitally coded DTMF is transmitted to the voice decoding section 14 under the control of the control section 113. The signal is decoded and D / A-converted by the CODEC unit 15, demodulated into an analog signal, and output to the exchange 20 via the interface unit 16. However, the DTMF of the reproduced analog audio is
It is not reproduced to the same frequency as the DTMF from the telephone, and is not correctly transmitted to the other party. For this reason, it is difficult for a wireless telephone terminal using a general telephone to receive a push line service by DTMF.

[0005] In view of the above-mentioned problem, the present invention blocks DTMF that has been illegitimately encoded by digital encoding, and corrects the DTMF.
It is an object of the present invention to provide a wireless telephone system capable of transmitting TMF to a communication partner.

[0006]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention provides a radio telephone base station connected to an exchange, and a radio telephone base station disposed between the radio telephone base station and the telephone. And a wireless telephone terminal for wirelessly transmitting and receiving signals, the wireless telephone terminal detects the dial input and transmits the dial tone information in order to correctly transmit the DTMF from the talking telephone to the other party. DTMF is transmitted to the radio telephone base station, and the radio telephone base station reproduces the DTMF on the analog line based on the dial tone information.

In the present invention, the wireless telephone terminal includes an SLIC unit for interfacing with a telephone,
A DTMF receiver for detecting DTMF in analog voice generated by the telephone, a CODEC for converting analog voice from the SLIC to digital voice, a voice coder for digitally coding digital voice, and a digitally coded voice A radio section for transmitting a signal and control information to a radio telephone base station, and control for generating control information from a DTMF detection signal from a DTMF receiver and transmitting the control information to the radio section for switching between an audio signal to be transmitted and control information. And a part.

In the embodiment of the present invention, the radio telephone base station 10 connected to the exchange 20 is disposed between the radio telephone base station 50 and the telephones 50a, 60a. In the wireless telephone system 1 having the wireless telephone terminals 50 and 60 performing transmission and reception of signals in
In order to correctly transmit the DTMF from the telephones 50a, 60a during a call to the other party, the wireless telephone terminals 50, 60
After detecting the dial input, converts the dial input into dial tone information and transmits the dial tone information to the wireless telephone base station 10.
Reproduces the DTMF on the analog line according to the dial tone information.

According to this configuration, the radio telephone terminal and the radio telephone base station do not transmit the DTMF signal from the telephone connected to the radio telephone terminal as a digitally coded signal. The telephone connected to the terminal can transmit the correct analog DTMF to the other party.

[0010]

Embodiments of the present invention will be described below with reference to the accompanying drawings. 1 is a configuration diagram of a radio telephone system according to the present invention, FIG. 2 is a block diagram showing a configuration of the radio telephone terminal of FIG. 1, FIG. 3 is a block diagram showing a configuration of the radio telephone base station of FIG. FIG. 4 is a flowchart illustrating the operation of the control unit that generates dial tone information in the wireless telephone terminal of FIG. The wireless telephone system 1 shown in FIG. 1 includes a wireless telephone base station 110 and a wireless telephone terminal 15 of the conventional wireless telephone system 101 shown in FIG.
0, 160 to the radio telephone base station 10 and the radio telephone terminal 5
0, 60, and the same reference numerals are given to devices having the same functions as those in the related art.

As shown in FIG. 1, a radio telephone system 1 includes a radio telephone base station 10 connected to an exchange 20;
It has radio telephone terminals 50 and 60 that are arranged between the radio telephone base station 10 and the telephones 50a and 60a and that transmit and receive signals to and from the radio telephone base station 10 by radio. Wireless telephone terminal 5
0,60 have the same internal configuration. In addition, the exchange 20
, Telephones 41, 42, 43 and PBX3
0 is connected, and the PBX 30 is connected to the telephones 31, 32, 3
3,34 are accommodated. In this case, when an analog line is used to receive a push line service using a tone signal to call the extension of the other party, for example, the telephone 31, from the general telephone, for example, the telephone 41, dial input on the telephone 41 is performed. D caused by
The TMF is transmitted to the other party as analog voice in the same manner as in the related art, whereby the DTMF receiver of the other party detects the TMF and the service is realized.

Next, a digital radiotelephone terminal 5
0 (the same applies to the wireless telephone terminal 60, the description will be made only for the wireless telephone terminal 50). The case where DTMF is sent will be described. The control unit 54 of the wireless telephone terminal 50 is configured such that the SLIC unit 51 transmits the DTMF from the telephone 50a.
Is received, it is confirmed whether DTMF has been received from the telephone set 50a during the call and a DTMF detection signal is received from the DTMF receiver 57, as shown in the flowchart of FIG. The DTMF receiver 57 also outputs a DTMF detection signal to the gate circuit 58. The gate circuit 58 has a DT
When the MF detection signal is received, the output of the CODEC unit 52 is interrupted from being supplied to the speech encoding unit 53, and the interruption is continued until the DTMF stops.

[0013] The control unit 54 controls the D
When the TMF detection signal is received, it turns OFF at the changing point.
At the time of change to ON, the dial tone information converted to the tone OFF control information is converted to the tone ON control information of 0-9 ** #, and at the time of change from ON to OFF, the radio base station 10
Send to Based on the received dial tone information, the radio telephone base station 10 drives the tone generator section 17 to reproduce the DTMF corresponding to the control information as an analog voice signal if the tone ON control information, and outputs it to the exchange 20. I do. The exchange 20 sends a correct DTMF based on the received analog voice signal to the other side of the telephone 50a to enable the service execution. If it is tone OFF control information, the radio telephone base station 10 recognizes that the received signal is a normal digitally encoded signal and performs processing corresponding to the signal.

[0014]

As described in detail above, the radio telephone system according to the present invention is arranged between a radio telephone base station connected to an exchange and a radio telephone base station and a telephone, and is provided with a radio telephone base station. And a wireless telephone terminal for transmitting and receiving signals wirelessly. In order to correctly transmit DTMF from the telephone during a call to the other party, the wireless telephone terminal detects dial input and converts it into dial tone information. To the radio telephone base station, and the radio telephone base station reproduces the DTMF on the analog line according to the dial tone information, so that the radio telephone terminal and the radio telephone base station can transmit from the telephone connected to the radio telephone terminal. DTMF signal is not transmitted as a digitally encoded signal, so that the telephone connected to the wireless telephone terminal can use the correct analog DTMF signal.
F can be transmitted to the other party, and the telephone line connected to the digital wireless telephone terminal can easily receive the push line service by DTMF.

[Brief description of the drawings]

FIG. 1 is a configuration diagram showing an example of an embodiment of a wireless telephone system according to the present invention.

FIG. 2 is a block diagram illustrating a configuration of the wireless telephone terminal of FIG. 1;

FIG. 3 is a block diagram showing a configuration of a wireless telephone base station in FIG. 1;

FIG. 4 is a flowchart illustrating an operation of a control unit that generates dial tone information in the wireless telephone terminal of FIG. 1;

FIG. 5 is a configuration diagram showing a conventional example of a wireless telephone system.

FIG. 6 is a block diagram showing a configuration of the wireless telephone terminal of FIG. 5;

FIG. 7 is a block diagram illustrating a configuration of the wireless telephone base station of FIG. 5;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Radiotelephone system 10 Radiotelephone base station 11, 56 Antenna 12, 55 Radio part 13, 54 Control part 14 Voice decoding part 15, 52 CODEC part 16 Interface part 17 Tone generator 20 Exchanger 30 PBX 31-34, 41-43, 50a, 60a Telephone 50, 60 Radiotelephone terminal 51 SLIC unit 53 Voice code unit 57 DTMF receiver 58 Gate circuit

Claims (2)

[Claims] 1. A wireless telephone base station connected to an exchange,
In a wireless telephone system that is provided between a wireless telephone base station and a telephone and has a wireless telephone terminal that transmits and receives signals to and from the wireless telephone base station, a DTMF (Dutel Tone Multi Freq) from a telephone during a call is provided.
uency), the wireless telephone terminal detects the dial input, converts it to dial tone information and transmits it to the wireless telephone base station, and the wireless telephone base station
A wireless telephone system wherein DTMF is reproduced on an analog line according to the dial tone information. 2. A wireless telephone terminal comprising: an SLIC unit for interfacing with a telephone; a DTMF receiver for detecting DTMF in analog voice generated by the telephone;
A CODEC unit for converting analog audio from the LIC unit to digital audio, an audio encoding unit for digitally encoding digital audio, and a radio unit for transmitting digitally encoded audio signals and control information to a wireless telephone base station. 2. The wireless telephone system according to claim 1, further comprising: a control unit that generates control information from a DTMF detection signal from a DTMF receiver and transmits the control information to a wireless unit, and switches between a voice signal to be transmitted and control information.