JPS55150666A - Modem control system in facsimile unit - Google Patents

Modem control system in facsimile unit

Info

Publication number
JPS55150666A
JPS55150666A JP5836879A JP5836879A JPS55150666A JP S55150666 A JPS55150666 A JP S55150666A JP 5836879 A JP5836879 A JP 5836879A JP 5836879 A JP5836879 A JP 5836879A JP S55150666 A JPS55150666 A JP S55150666A
Authority
JP
Japan
Prior art keywords
speed modem
demodulator
modem
speed
turning
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.)
Granted
Application number
JP5836879A
Other languages
Japanese (ja)
Other versions
JPS6230550B2 (en
Inventor
Tateo Teraoka
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 JP5836879A priority Critical patent/JPS55150666A/en
Publication of JPS55150666A publication Critical patent/JPS55150666A/en
Publication of JPS6230550B2 publication Critical patent/JPS6230550B2/ja
Granted 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

Landscapes

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

Abstract

PURPOSE:To stabilize communication, by turning on the reception request of a high- speed MODEM with fixed-time delay after turning off a low-speed MODEM transmission request in case that two MODEMs different in modulation system and transmission speed are connected to the same line. CONSTITUTION:Control signals 14 and 16 are transmitted to low-speed MODEM modulator 1 and low-speed MODEM demodulator 5 respectively from MODEM control part 30 to request transmission and reception, and control signals 15 and 17 are transmitted to high-speed MODEM modulator 2 and high-speed MODEM demodulator 6 respectively to request transmission and reception. Output signals of modulators 1 and 2 are transmitted to line 9 through mixing part 3 and filter attenuator equalizer part 4, and the receiving part is connected to demodulator 5, AGC circuit part 7 and demodulator 6 through filter equalizer paet 8. Then, after turning off signal 14, signal 17 is turned on after the time for sufficient attenuation of circulating components of output signal 41 of modulator 1 into the high-speed MODEM receiving part elapses. As a result, receiving impossibility dependent upon degradation of the receiving sensitivity for the operation of circuit 7 can be prevented to stabilize communication.
JP5836879A 1979-05-11 1979-05-11 Modem control system in facsimile unit Granted JPS55150666A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP5836879A JPS55150666A (en) 1979-05-11 1979-05-11 Modem control system in facsimile unit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP5836879A JPS55150666A (en) 1979-05-11 1979-05-11 Modem control system in facsimile unit

Publications (2)

Publication Number Publication Date
JPS55150666A true JPS55150666A (en) 1980-11-22
JPS6230550B2 JPS6230550B2 (en) 1987-07-02

Family

ID=13082377

Family Applications (1)

Application Number Title Priority Date Filing Date
JP5836879A Granted JPS55150666A (en) 1979-05-11 1979-05-11 Modem control system in facsimile unit

Country Status (1)

Country Link
JP (1) JPS55150666A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5839167A (en) * 1981-09-01 1983-03-07 Nec Corp Transmission speed converting system for facsimile
JPS5874793U (en) * 1981-11-17 1983-05-20 加藤　博 "Kei" light discharge lamp lighting device

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5355902A (en) * 1976-10-30 1978-05-20 Fujitsu Ltd Data transmission system

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5355902A (en) * 1976-10-30 1978-05-20 Fujitsu Ltd Data transmission system

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5839167A (en) * 1981-09-01 1983-03-07 Nec Corp Transmission speed converting system for facsimile
JPS5874793U (en) * 1981-11-17 1983-05-20 加藤　博 "Kei" light discharge lamp lighting device

Also Published As

Publication number Publication date
JPS6230550B2 (en) 1987-07-02

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