JPS55140369A - Carrier detecting system of facsimile - Google Patents

Carrier detecting system of facsimile

Info

Publication number
JPS55140369A
JPS55140369A JP4800979A JP4800979A JPS55140369A JP S55140369 A JPS55140369 A JP S55140369A JP 4800979 A JP4800979 A JP 4800979A JP 4800979 A JP4800979 A JP 4800979A JP S55140369 A JPS55140369 A JP S55140369A
Authority
JP
Japan
Prior art keywords
carrier
phase signal
counter
signal
output
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
JP4800979A
Other languages
Japanese (ja)
Inventor
Ryoji Arai
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.)
NEC Corp
Original Assignee
NEC Corp
Nippon Electric Co Ltd
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 NEC Corp, Nippon Electric Co Ltd filed Critical NEC Corp
Priority to JP4800979A priority Critical patent/JPS55140369A/en
Publication of JPS55140369A publication Critical patent/JPS55140369A/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
    • H04N1/00095—Systems or arrangements for the transmission of the picture signal

Abstract

PURPOSE:To reduce irregularity of the time until CD (carrier detection output) turning-on to enhance reliability, by detecting the carrier only when a signal of a fixed-range period comes fixed-number times. CONSTITUTION:When signal RPHS5 which has the waveform shaped is input, counter 7 consisting of IC1 starts counting square wave V9CK6 from the rise time, and an output pulse appears in NAND gate 9 to set Q1 of FF10 to 1 just when counter 7 counts 1556. The phase signal falls at a period of 333.3ms, and counter 7 is reset. Then, output Q2 of FF11 is set to 1 when the counter counts 1556 in the counting started from the rise of the second phase signal. At the rise of the next phase signal, output Q3 of FF12 is set to 1. That is, carrier detecton signal CD is turned on when the period of the phase signal comes twice accurately. Thus, CD is turned on when regular phase signal comes, and the carrier is so detected that no carrier may be detected for signals other than the regular phase signal.
JP4800979A 1979-04-20 1979-04-20 Carrier detecting system of facsimile Pending JPS55140369A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP4800979A JPS55140369A (en) 1979-04-20 1979-04-20 Carrier detecting system of facsimile

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP4800979A JPS55140369A (en) 1979-04-20 1979-04-20 Carrier detecting system of facsimile

Publications (1)

Publication Number Publication Date
JPS55140369A true JPS55140369A (en) 1980-11-01

Family

ID=12791291

Family Applications (1)

Application Number Title Priority Date Filing Date
JP4800979A Pending JPS55140369A (en) 1979-04-20 1979-04-20 Carrier detecting system of facsimile

Country Status (1)

Country Link
JP (1) JPS55140369A (en)

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5117619A (en) * 1974-08-02 1976-02-12 Tokyo Shibaura Electric Co

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5117619A (en) * 1974-08-02 1976-02-12 Tokyo Shibaura Electric Co

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