GB1431292A - Facsimile communication system - Google Patents

Facsimile communication system

Info

Publication number
GB1431292A
GB1431292A GB2186873A GB2186873A GB1431292A GB 1431292 A GB1431292 A GB 1431292A GB 2186873 A GB2186873 A GB 2186873A GB 2186873 A GB2186873 A GB 2186873A GB 1431292 A GB1431292 A GB 1431292A
Authority
GB
United Kingdom
Prior art keywords
signal
remote
video
mode
received
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.)
Expired
Application number
GB2186873A
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.)
Xerox Corp
Original Assignee
Xerox 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 Xerox Corp filed Critical Xerox Corp
Publication of GB1431292A publication Critical patent/GB1431292A/en
Expired legal-status Critical Current

Links

Classifications

    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04NPICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N1/00Scanning, transmission or reproduction of documents or the like, e.g. facsimile transmission; Details thereof
    • H04N1/32Circuits 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
    • H04N1/333Mode signalling or mode changing; Handshaking therefor
    • H04N1/33307Mode signalling or mode changing; Handshaking therefor prior to start of transmission, input or output of the picture signal only
    • H04N1/33323Mode signalling or mode changing; Handshaking therefor prior to start of transmission, input or output of the picture signal only transmission mode only, e.g. speed
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04NPICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N1/00Scanning, transmission or reproduction of documents or the like, e.g. facsimile transmission; Details thereof
    • H04N1/00095Systems or arrangements for the transmission of the picture signal
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04NPICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N1/00Scanning, transmission or reproduction of documents or the like, e.g. facsimile transmission; Details thereof
    • H04N1/32Circuits 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
    • H04N1/327Initiating, continuing or ending a single-mode communication; Handshaking therefor
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04NPICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N1/00Scanning, transmission or reproduction of documents or the like, e.g. facsimile transmission; Details thereof
    • H04N1/32Circuits 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
    • H04N1/333Mode signalling or mode changing; Handshaking therefor
    • H04N1/33307Mode signalling or mode changing; Handshaking therefor prior to start of transmission, input or output of the picture signal only
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04NPICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N1/00Scanning, transmission or reproduction of documents or the like, e.g. facsimile transmission; Details thereof
    • H04N1/32Circuits 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
    • H04N1/333Mode signalling or mode changing; Handshaking therefor
    • H04N1/33307Mode signalling or mode changing; Handshaking therefor prior to start of transmission, input or output of the picture signal only
    • H04N1/33315Mode signalling or mode changing; Handshaking therefor prior to start of transmission, input or output of the picture signal only reading or reproducing mode only, e.g. sheet size, resolution

Landscapes

  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Facsimile Transmission Control (AREA)
  • Facsimile Scanning Arrangements (AREA)
  • Facsimiles In General (AREA)
  • Telephonic Communication Services (AREA)
  • Facsimile Image Signal Circuits (AREA)

Abstract

1431292 Facsimile system XEROX CORP 8 May 1973 [16 May 1972] 21868/73 Heading H4F In a method of transmitting facsimile video signals over a standard telephone line the video signal is initially reduced in bandwidth, then frequency modulated on a carrier signal and the frequency modulated carrier signal passed through a vestigial sideband transmission filter. The system uses identical transmitter-receiver sets at either end of a standard telephone link whereby all audio messages can be transmitted over the telephone link in the normal manner and the transmitter-receiver sets connected into the link when desired. Each set is normally in a standby printer mode and upon instruction can operate in one of three possible modes. Principle mode-at the local set the original document is manually loaded into the scanning position and the remote set operates in an automatic unattended print-out mode. Auto feed mode-a stack of original documents are put into the local set and are sequentially automatically loaded into the scanning position. Remote operation mode-the local set transmits a signal to the remote set instructing it to start transmitting an original, the local set then operating as the printer. A forward control signal is produced by means 58, Fig. 2, and after frequency modulation on carrier FS at 38 is transmitted over the telephone line 21 to the remote set to there produce after demodulation at 40 and detection at 59 an enquiry as to whether the remote set is ready to receive and print. The remote set replies from 50 with an acknowledgement signal which is received back at the local set at 62. A start button is now pushed and a carrier at FS is transmitted to the remote set where it is received at 59 and indicates that the remote set is coupled to a similar transmit receiver set and also clears away any echo suppressions in the telephone line. A series of equalization pulses 80, Fig. 3, are transmitted by the local station and utilized at the remote station by an automatic equalizer to compensate for distortion in the transmission line. Sync. pulses follow from the local station and enable scan and framing synchronism at the remote station. The width of the synchronizing pulses is varied to indicate whether or not video information is to follow being narrow for novideo and wide for video to follow. Pairs of video pulses indicating end of transmission, and both local and remote stations return to a standby mode if a new video signal is not received within a set time. Two of the sync pulses determine and signal the scan line pitch by means of their amplitudes (86, 88). Video signals from scanner 90, Fig. 5A, after peaking and clipping at 91, 92, are encoded at 93 to reduce bandwidth. One method of bandwidth reduction is the phase inversion of alternate lines of video. In the frequency modulator 38 the bandwidth reduced video signal controls a variable oscillator 95 the output of which is fed via an output driver 98 to a vestigial side band filter 100 whereby further bandwidth reduced video is fed to the telephone line 12. When operating in the remote mode or as a printer the received video signal, after passing through preamp 103 and equalization in network 104 using the already referred to equalization pulses, is frequency demodulated at 60 using limiter 108 and zero crossing detector 110. The frequency demodulated signal is now passed through a full wave rectifier which removes the alternate phase reversal produced by encoder 93. The video signal is passed to a half-tone printer 236. The various widths of the received synchronizing pulses are detected by means 128, 130, 126. The signal from the remote set indicating ready to receive is received and detected by means 145, 143. An emergency stop signal can also be received and detected by means 153 and 155. The scanning and printing means both use a laser 150, Fig. 9. In the scanning mode the original 164 is scanned through a glass plate 170 by the laser beam 172 via mirrors 184, 186, 180, 194 and 196, a cylindrical lens 188 giving an elliptical cross-section to the beam, mirror 180 being a galvanometer mirror vibrated under the control of a line scanning sawtooth wave, and mirror 194 being in the position shown in full lines for scanning, but in the dotted position for printing. Light reflected from the original is detected by photodetector 174 and subjected to D.C. restoration at 176. A variable attenuator filter 182 is used to compensate when more than one scanning speed is used. In the printing mode a xero graphic system is used. Such system is described in U.S.A. Specification 2,297,691. To produce half tone signals from the continuous video signal 243, Fig. 15, the video signal is added to a triangular wave 242 and the sum compared with a threshold 245, the intercepts of the summation wave with the threshold being turned into a variable pulse width half tone actuator signal 246. Flow diagrams for all of the modes described and the variations thereof are fully given Figs. 18, 19, 20, 21, 22, 24, 25, 28 and 29, all not shown.
GB2186873A 1972-05-16 1973-05-08 Facsimile communication system Expired GB1431292A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US25382772A 1972-05-16 1972-05-16

Publications (1)

Publication Number Publication Date
GB1431292A true GB1431292A (en) 1976-04-07

Family

ID=22961867

Family Applications (6)

Application Number Title Priority Date Filing Date
GB149375A Expired GB1431300A (en) 1972-05-16 1973-05-08 Facsimile communication system
GB147875A Expired GB1431297A (en) 1972-05-16 1973-05-08 Facsimile communication system
GB149175A Expired GB1431299A (en) 1972-05-16 1973-05-08 Facsimile communication system
GB2186873A Expired GB1431292A (en) 1972-05-16 1973-05-08 Facsimile communication system
GB148775A Expired GB1431298A (en) 1972-05-16 1973-05-08 Facsimile communication system
GB145775A Expired GB1431296A (en) 1972-05-16 1973-05-08 Facsimile communication system

Family Applications Before (3)

Application Number Title Priority Date Filing Date
GB149375A Expired GB1431300A (en) 1972-05-16 1973-05-08 Facsimile communication system
GB147875A Expired GB1431297A (en) 1972-05-16 1973-05-08 Facsimile communication system
GB149175A Expired GB1431299A (en) 1972-05-16 1973-05-08 Facsimile communication system

Family Applications After (2)

Application Number Title Priority Date Filing Date
GB148775A Expired GB1431298A (en) 1972-05-16 1973-05-08 Facsimile communication system
GB145775A Expired GB1431296A (en) 1972-05-16 1973-05-08 Facsimile communication system

Country Status (5)

Country Link
JP (7) JPS4967513A (en)
CA (1) CA1007356A (en)
DE (1) DE2324510A1 (en)
GB (6) GB1431300A (en)
NL (1) NL7306785A (en)

Families Citing this family (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FI51715C (en) * 1975-07-03 1977-03-10 Raimo Talikka Method and device for simultaneous hardening and hot-dip galvanizing of iron and steel products.
US4079425A (en) * 1975-09-26 1978-03-14 Exxon Research & Engineering Co. Facsimile transmission mode signaling
JPS56143264U (en) * 1980-03-28 1981-10-29
JPS58106946A (en) * 1981-12-20 1983-06-25 Toshiba Corp Facsimile concentrating system
JPS6253772A (en) * 1985-08-30 1987-03-09 Mitsubishi Paper Mills Ltd Coating apparatus
CH675257A5 (en) * 1988-02-09 1990-09-14 Battelle Memorial Institute
JPH04293757A (en) * 1991-03-23 1992-10-19 Totoku Electric Co Ltd Production of flat square coated wire
CN114268421B (en) * 2021-12-17 2024-04-19 安徽问天量子科技股份有限公司 Method for transmitting synchronous signal of single-fiber QKD system

Also Published As

Publication number Publication date
GB1431296A (en) 1976-04-07
JPS514914A (en) 1976-01-16
GB1431300A (en) 1976-04-07
GB1431297A (en) 1976-04-07
JPS5110713A (en) 1976-01-28
JPS5110712A (en) 1976-01-28
CA1007356A (en) 1977-03-22
NL7306785A (en) 1973-07-25
JPS5140019A (en) 1976-04-03
DE2324510A1 (en) 1973-11-29
JPS514915A (en) 1976-01-16
JPS4967513A (en) 1974-07-01
JPS5140017A (en) 1976-04-03
GB1431299A (en) 1976-04-07
GB1431298A (en) 1976-04-07

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Legal Events

Date Code Title Description
PS Patent sealed
746 Register noted 'licences of right' (sect. 46/1977)
PCNP Patent ceased through non-payment of renewal fee