JPS5746568A - Digital facsimile device - Google Patents

Digital facsimile device

Info

Publication number
JPS5746568A
JPS5746568A JP55122255A JP12225580A JPS5746568A JP S5746568 A JPS5746568 A JP S5746568A JP 55122255 A JP55122255 A JP 55122255A JP 12225580 A JP12225580 A JP 12225580A JP S5746568 A JPS5746568 A JP S5746568A
Authority
JP
Japan
Prior art keywords
bps
receiving
transmission speed
modem
receiving part
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
JP55122255A
Other languages
Japanese (ja)
Inventor
Akio Tamura
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.)
Hitachi Ltd
Original Assignee
Hitachi 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 Hitachi Ltd filed Critical Hitachi Ltd
Priority to JP55122255A priority Critical patent/JPS5746568A/en
Publication of JPS5746568A publication Critical patent/JPS5746568A/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

Landscapes

  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Facsimiles In General (AREA)
  • Facsimile Image Signal Circuits (AREA)
  • Digital Transmission Methods That Use Modulated Carrier Waves (AREA)
  • Communication Control (AREA)

Abstract

PURPOSE:To simplify the circuit constitution, by constituting a MODEM where the transmission speed is different in transmission and receiving. CONSTITUTION:In the 4800 BPS MODEM of a maxmimum transmission speed 4800 BPS (bit per sec.), the price of the receiving part is expensive because the receiving part requires circuits such as an automatic equalizing circuit. Therefore, if the function of the receiving part is set to 2400 BPS of the fall back mode, the circuit constitution is simplified and the price is lowered. For example, the receiving signal coming from a line 7 is applied to a demodulating part 31, which is the receiving part of the MODEM, through a line control part 4. In case of transmission speed 4800 BPS, incapability of receiving and demodulation is reported to the other- party station, and the transmission speed is caused to fall back to 2400 BPS. Only the signal coming with 2400 BPS is demodulated and is applied to decoding part 6 and is decoded into a picture signal, and the original picture is restored in a recording part 5.
JP55122255A 1980-09-05 1980-09-05 Digital facsimile device Pending JPS5746568A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP55122255A JPS5746568A (en) 1980-09-05 1980-09-05 Digital facsimile device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP55122255A JPS5746568A (en) 1980-09-05 1980-09-05 Digital facsimile device

Publications (1)

Publication Number Publication Date
JPS5746568A true JPS5746568A (en) 1982-03-17

Family

ID=14831419

Family Applications (1)

Application Number Title Priority Date Filing Date
JP55122255A Pending JPS5746568A (en) 1980-09-05 1980-09-05 Digital facsimile device

Country Status (1)

Country Link
JP (1) JPS5746568A (en)

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