JPS57176880A - Signal transmitting system for facsimile - Google Patents

Signal transmitting system for facsimile

Info

Publication number
JPS57176880A
JPS57176880A JP56061793A JP6179381A JPS57176880A JP S57176880 A JPS57176880 A JP S57176880A JP 56061793 A JP56061793 A JP 56061793A JP 6179381 A JP6179381 A JP 6179381A JP S57176880 A JPS57176880 A JP S57176880A
Authority
JP
Japan
Prior art keywords
carrier frequency
circuit
transmission line
vsb
ternary
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
JP56061793A
Other languages
Japanese (ja)
Inventor
Takashi Ogawa
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 JP56061793A priority Critical patent/JPS57176880A/en
Publication of JPS57176880A publication Critical patent/JPS57176880A/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

Landscapes

  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Facsimile Image Signal Circuits (AREA)

Abstract

PURPOSE:To obtain high-speed performance through a simple analog modulating/ demodulating circuit, by setting the carrier frequency of a picture signal on an area in which large distortion generates in a transmission line of the transmitting side and providing the receiving side with an automatic equalizing circuit. CONSTITUTION:A picture signal photoelectrically converted from the black- and-white information of a transmitted original is ternary-converted by a ternary-converting circuit 11 and the carrier frequency is amplituded and pulse- modulated in a modulating part 12. In this case, the carrier frequency is set to about 3,000Hz in which large distortion generates in the transmission line. The modulated signal is vestigial side band (VSB)-shaped by a VSB filber 14 and sent to the transmission line. In the receiving side, a clear demodulated signal is obtained through a filter 21, an automatic gain controlling (AGC) circuit 22, an automatic equalizing circuit 23, and a demodulating part 24. Consequently, signals can be transmitted quickly by increasing the carrier frequency until the influence of line distortion is largely exerted.
JP56061793A 1981-04-23 1981-04-23 Signal transmitting system for facsimile Pending JPS57176880A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP56061793A JPS57176880A (en) 1981-04-23 1981-04-23 Signal transmitting system for facsimile

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP56061793A JPS57176880A (en) 1981-04-23 1981-04-23 Signal transmitting system for facsimile

Publications (1)

Publication Number Publication Date
JPS57176880A true JPS57176880A (en) 1982-10-30

Family

ID=13181326

Family Applications (1)

Application Number Title Priority Date Filing Date
JP56061793A Pending JPS57176880A (en) 1981-04-23 1981-04-23 Signal transmitting system for facsimile

Country Status (1)

Country Link
JP (1) JPS57176880A (en)

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