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KR930011604A - Tone Detection Circuit for Automatic Telephone / Fax Switching - Google Patents

Tone Detection Circuit for Automatic Telephone / Fax Switching Download PDF

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Publication number
KR930011604A
KR930011604A KR1019910021249A KR910021249A KR930011604A KR 930011604 A KR930011604 A KR 930011604A KR 1019910021249 A KR1019910021249 A KR 1019910021249A KR 910021249 A KR910021249 A KR 910021249A KR 930011604 A KR930011604 A KR 930011604A
Authority
KR
South Korea
Prior art keywords
transmission message
signal
party
tone
transmission
Prior art date
Application number
KR1019910021249A
Other languages
Korean (ko)
Inventor
최돈철
Original Assignee
정용문
삼성전자 주식회사
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 정용문, 삼성전자 주식회사 filed Critical 정용문
Priority to KR1019910021249A priority Critical patent/KR930011604A/en
Publication of KR930011604A publication Critical patent/KR930011604A/en

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Abstract

팩시밀리에서 전화/팩스 자동 절체 모드로 설정되어 있을 경우 상대방으로 부터의 호출에 응답하여 모드를 절체하기 위하여 CNG 톤 수신 여부를 검출할시 반드시 송신 메시지 송출완료후 CNG 톤 수신 여부를 검출 해야하는 것을 개선하기 위한 회로이다.When the fax is set to the telephone / fax automatic switching mode, when detecting whether to receive the CNG tone in order to switch the mode in response to a call from the other party, the CNG tone must be detected after the transmission message is sent. For the circuit.

이를 위하여 송신 메시지 신호를 상대방으로 송출하는 동시에 반전시키고, 상기 상대방으로 송출하는 송신 메시지 신호 및 상대방으로부터 수신되는 톤 신호가 중첩된 신호와 상기 반전된 송신 메시지 신호를 차동 증폭하여 상기 수신 톤신호만을 정확하게 분리한다.To this end, the transmission message signal is transmitted to the other party and inverted. The transmission message signal transmitted to the other party and the tone signal received from the other party are differentially amplified and the inverted transmission message signal is differentially amplified to accurately receive only the received tone signal. Separate.

따라서 송신메시지 신호 송출시 송신메시지 신호에 CNG 톤과 유사한 신호가 있을 경우에도 송신메시지 송출중에 상대방으로부터 수신되는 CNG 톤을 검출함으로써 상대방이 팩스 모드일 경우에 송신 메시지 송출 완료시까지 대기하는 시간을 줄인다.Therefore, even when the transmission message signal has a signal similar to the CNG tone, the CNG tone received from the other party is detected during transmission of the transmission message, thereby reducing the waiting time until the transmission message transmission is completed when the other party is in the fax mode.

Description

팩시밀리의 전화/팩스 자동 절체를 위한 톤 검출회로Tone Detection Circuit for Automatic Telephone / Fax Switching

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

제3도는 본 발명에 따른 톤 검출 회로의 블럭 구성도,3 is a block diagram of a tone detection circuit according to the present invention;

제4도는 본 발명에 따른 흐름도.4 is a flow chart according to the present invention.

Claims (1)

상대방으로부터의 호출에 응답하여 송신 메시지 신호를 송출하기 위한 송신 메시지 회로(20)와, 모뎀(30)과, 상기 송신 메시지 신호를 비반전 증폭하여 전화라인을 통하여 송신하는 송신 증폭기(50)를 구비한 팩시밀리에 있어서, 상기 송신 메시지 신호를 반전 증폭하는 반전 증폭기(60)와, 상기 송신 증폭기(50) 및 상기 반전 증폭기(60)의 출력단에 두 입력단자가 접속되어 상기 상대방으로 송신하는 송신 메시지 신호 및 상기 전화라인을 통하여 상대방으로부터 수신되는 톤신호가 중첩된 신호와 상기 반전된 송신 메시지 신호를 차동 증폭함에 의해 상기 수신 톤 신호를 분리하여 상기 모뎀(30)에 인가하는 차동 증폭기(70)로 구성하는 것을 특징으로 하는 전화/팩스 자동 절체를 위한 톤 검출회로.A transmission message circuit 20 for transmitting a transmission message signal in response to a call from the other party, a modem 30, and a transmission amplifier 50 for non-inverting and transmitting the transmission message signal through a telephone line. In one facsimile, two input terminals are connected to an inverting amplifier 60 for inverting and amplifying the transmission message signal, and an output terminal of the transmitting amplifier 50 and the inverting amplifier 60 to transmit the transmission message signal to the counterpart. And a differential amplifier 70 for separating the received tone signal and applying the received tone signal to the modem 30 by differentially amplifying the overlapped tone signal received from the other party and the inverted transmission message signal through the telephone line. Tone detection circuit for automatic telephone / fax switching characterized in that. ※ 참고사항 : 최초출원 내용에 의하여 공개하는 것임.※ Note: The disclosure is based on the initial application.
KR1019910021249A 1991-11-26 1991-11-26 Tone Detection Circuit for Automatic Telephone / Fax Switching KR930011604A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
KR1019910021249A KR930011604A (en) 1991-11-26 1991-11-26 Tone Detection Circuit for Automatic Telephone / Fax Switching

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
KR1019910021249A KR930011604A (en) 1991-11-26 1991-11-26 Tone Detection Circuit for Automatic Telephone / Fax Switching

Publications (1)

Publication Number Publication Date
KR930011604A true KR930011604A (en) 1993-06-24

Family

ID=67356536

Family Applications (1)

Application Number Title Priority Date Filing Date
KR1019910021249A KR930011604A (en) 1991-11-26 1991-11-26 Tone Detection Circuit for Automatic Telephone / Fax Switching

Country Status (1)

Country Link
KR (1) KR930011604A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100753375B1 (en) * 1999-02-10 2007-08-30 퀄컴 인코포레이티드 Method and apparatus for detecting fax calls

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100753375B1 (en) * 1999-02-10 2007-08-30 퀄컴 인코포레이티드 Method and apparatus for detecting fax calls

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Legal Events

Date Code Title Description
PA0109 Patent application

Patent event code: PA01091R01D

Comment text: Patent Application

Patent event date: 19911126

PG1501 Laying open of application
PC1203 Withdrawal of no request for examination
WITN Application deemed withdrawn, e.g. because no request for examination was filed or no examination fee was paid