KR950007380A

KR950007380A - Voice interruption prevention circuit in data / fax modem

Info

Publication number: KR950007380A
Application number: KR1019930015269A
Authority: KR
Inventors: 김흥태
Original assignee: 이헌조; 주식회사 금성사
Priority date: 1993-08-06
Filing date: 1993-08-06
Publication date: 1995-03-21

Abstract

본 발명은 데이터/팩스용 모뎀에서의 음성통화 중단 방지회로에 관한 것으로 특히 전화라인을 통해 데이터통신을 하는 모뎀에서 전화통화도중 모뎀의 사용으로 인해 전화통화가 중단되는 것을 방지하는데 적당하도록 한 것이다.The present invention relates to a voice call interruption prevention circuit in a modem for data / fax, and is particularly suitable for preventing a telephone call from being interrupted due to the use of a modem during a phone call in a modem communicating data through a telephone line.

종래의 기술은 모뎀에 부착된 전화기로 전화통화를 하고 있는 동안에 호스트컴퓨터의 동작으로 모뎀을 작동시키면 모뎀내부의 릴레이가 직접적으로 온 상태가 되면서 모뎀은 데이터 통신상태가 되지만, 기존의 진행중인 전화통화는 중단되어 버리는 문제점이 있었다.In the prior art, if the modem is operated by the operation of the host computer while the telephone is attached to the modem, the modem is in a data communication state while the relay inside the modem is directly turned on. There was a problem that was interrupted.

따라서 본 발명은 데이터/팩스용 모뎀에 전화통화 여부를 인지하는 전화통화 인지수단과 전화통화 인지신호 및 모뎀내부 제어로직의 출력에 의해 릴레이를 제어하는 릴레이 제어수단을 구비시켜 전화통화도중 모뎀의 사용으로 인한 전화통화 중단을 방지하도록한 데이터/팩스용 모뎀에서의 음성통화 중단 방지회를 구성한 것임.Accordingly, the present invention provides a modem for a telephone call by including a telephone call recognition means for recognizing a telephone call and a relay control means for controlling a relay by an output of the telephone call recognition signal and the modem internal control logic. It is a voice call interruption prevention session in the modem for data / fax to prevent the interruption of the telephone call.

Description

Voice interruption prevention circuit in data / fax modem

본 내용은 요부공개 건이므로 전문내용을 수록하지 않았음Since this is an open matter, no full text was included.

제2도는 본 발명의 데이터/팩스용 모뎀에서의 음성 통화중단 방지회로 블럭도,2 is a block diagram of a voice interruption prevention circuit in the data / fax modem of the present invention;

제3도는 제2도의 전화통화 인지수단 실시회로도,3 is a circuit diagram of the telephone call recognition means of FIG.

제4도는 제2도의 릴레이 제어수단 실시회로도.4 is a circuit diagram of the relay control means of FIG.

Claims

In the modem for data / fax characterized in that it comprises a telephone call recognition means for recognizing whether or not a telephone call, and a relay control means for controlling a relay connected to a telephone line by the output of the telephone call recognition signal and the modem internal control logic. Voice call interruption prevention circuit.

2. A voice in a modem for data / fax according to claim 1, wherein the telephone call recognition means comprises a voltage comparator 5a for comparing a reference voltage (+5 volt) and a telephone line (TL) voltage. Call interruption protection circuit.

2. The relay (6) according to claim 1, wherein the relay control means uses a telephone call recognition signal (CTL 2) output from the voltage comparator as an input (D), and outputs an output (CTL 1) of the control logic for controlling the relay inside the modem. Inverted to a clock CLK signal and composed of a de-flip flop 6b having the RC circuits Ro and Co as an initialization signal CLR, and converting the inverse thrust Q into a relay control signal CTLφ. A voice call prevention circuit in a data / fax modem, configured to be used.

※ Note: The disclosure is based on the initial application.