JPS5741072A - Facsimile call signal deciding system - Google Patents

Facsimile call signal deciding system

Info

Publication number
JPS5741072A
JPS5741072A JP55116570A JP11657080A JPS5741072A JP S5741072 A JPS5741072 A JP S5741072A JP 55116570 A JP55116570 A JP 55116570A JP 11657080 A JP11657080 A JP 11657080A JP S5741072 A JPS5741072 A JP S5741072A
Authority
JP
Japan
Prior art keywords
signal
frequency
band
call signal
detection
Prior art date
Legal status (The legal status 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 status listed.)
Pending
Application number
JP55116570A
Other languages
Japanese (ja)
Inventor
Yukio Kirihara
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Nippon Telegraph and Telephone Corp
Original Assignee
Nippon Telegraph and Telephone Corp
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 Nippon Telegraph and Telephone Corp filed Critical Nippon Telegraph and Telephone Corp
Priority to JP55116570A priority Critical patent/JPS5741072A/en
Publication of JPS5741072A publication Critical patent/JPS5741072A/en
Pending legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N1/00—Scanning, transmission or reproduction of documents or the like, e.g. facsimile transmission; Details thereof
    • H04N1/32—Circuits or arrangements for control or supervision between transmitter and receiver or between image input and image output device, e.g. between a still-image camera and its memory or between a still-image camera and a printer device

Abstract

PURPOSE:To prevent a malfunction due to a leakage signal, etc., by taking AND of a signal for detecting the frequency by a band pass filter at the side of a receiving terminal, and a signal not for detecting the requency by a band-rejection filter, and deciding a call signal. CONSTITUTION:When a push-button signal caused by malfunction leaks to an adjacent receiving terminal 3, a band pass filter 5 informs a detection of frequency f1 being close to frequency of a facsimile call signal, to a controlling circuit 7. On the other hand, a band-rejection filter 6 informs a detection of other interference frequency f2 to the controlling circuit 7 in the same way. When information relating to a detection of frequency has been received from both the band pass filter 5 of the facsimile call signal frequency, and the band-rejection filter 6, the controlling circuit 7 considers it to have been caused by a leakage signal, and drives no response signal sending circuit 8 nor receiving recording circuit 9. Accordingly, a malfunction caused by an erroneous operation of a push-button telephone, etc. in the adjacent line is prevented.
JP55116570A 1980-08-25 1980-08-25 Facsimile call signal deciding system Pending JPS5741072A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP55116570A JPS5741072A (en) 1980-08-25 1980-08-25 Facsimile call signal deciding system

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP55116570A JPS5741072A (en) 1980-08-25 1980-08-25 Facsimile call signal deciding system

Publications (1)

Publication Number Publication Date
JPS5741072A true JPS5741072A (en) 1982-03-06

Family

ID=14690374

Family Applications (1)

Application Number Title Priority Date Filing Date
JP55116570A Pending JPS5741072A (en) 1980-08-25 1980-08-25 Facsimile call signal deciding system

Country Status (1)

Country Link
JP (1) JPS5741072A (en)

Similar Documents

Publication Publication Date Title
US4213009A (en) System of connecting a wire telecommunication and a radio communication
EP1009100A3 (en) Interference canceling device
JPS5741072A (en) Facsimile call signal deciding system
US4115668A (en) Echo suppressor with SF transmission and regeneration
FR2359554A1 (en) Two condition telephone alarm system - employs low frequency carrier modulated with test frequency to indicate two possible alarm states
AU2143777A (en) Multifrequency signal receiver reference signal circuit
ES8401815A1 (en) Method and arrangement for signaling the transmission mode of a communication system.
JPS5538702A (en) Detection system for procedure interruption signal
JPS5591252A (en) Automatic answering telephone set
JPS5742248A (en) Switching device for communication system
JPS5451702A (en) Automatic power supply cut-off circuit
JPS57194658A (en) Guard terminal device
FR2395557A1 (en) Public telephone call box burglary detection system - uses telephone line to transmit alarm signals to exchange
GB2003704A (en) Digital data signalling systems
JPS59160373A (en) Call signal detection system
KR850002187A (en) Telephone short circuit
JPS6223156Y2 (en)
JPH0576822B2 (en)
JPS5514712A (en) Communication system for record information of telephone circuit
JPS57174941A (en) Automatic hybrid circuit
JPS57150245A (en) Beat detecting system of radio receiver
JPS56100555A (en) Automatic answering telephone set
JPS55105764A (en) Input and output unit for magnetic tape recording and reproducing unit
JPS52152104A (en) Multi-frequency signal receiver
JPS56128057A (en) Automatic circuit supervisory unit