GB769808A - Improvements in or relating to facsimile recording apparatus - Google Patents

Improvements in or relating to facsimile recording apparatus

Info

Publication number
GB769808A
GB769808A GB1289855A GB1289855A GB769808A GB 769808 A GB769808 A GB 769808A GB 1289855 A GB1289855 A GB 1289855A GB 1289855 A GB1289855 A GB 1289855A GB 769808 A GB769808 A GB 769808A
Authority
GB
United Kingdom
Prior art keywords
valve
pulse
conducts
grid
positive
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
GB1289855A
Inventor
Frederick Percival Mason
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.)
Creed and Co Ltd
Original Assignee
Creed and 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
Priority to NL104686D priority Critical patent/NL104686C/xx
Priority to BE547499D priority patent/BE547499A/xx
Application filed by Creed and Co Ltd filed Critical Creed and Co Ltd
Priority to GB1289855A priority patent/GB769808A/en
Priority to CH333038D priority patent/CH333038A/en
Priority to FR1152714D priority patent/FR1152714A/en
Priority to DEC12968A priority patent/DE1018453B/en
Publication of GB769808A publication Critical patent/GB769808A/en
Expired 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
    • H04N1/36—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 for synchronising or phasing transmitter and receiver
    • 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
    • H04N1/327—Initiating, continuing or ending a single-mode communication; Handshaking therefor

Landscapes

  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Fax Reproducing Arrangements (AREA)
  • Facsimiles In General (AREA)
  • Television Signal Processing For Recording (AREA)

Abstract

769,808. Copying-telegraph receivers. CREED & CO.,' Ltd. May 4, 1955, No.12898/55. Class 40 (3). An arrangement for protecting a facsimile recording apparatus against a false start in response to random signals comprises means for registering a first incoming pulse and generating subsequently, at a predetermined time interval, a testing pulse which in combination with a second incoming pulse starts the recorder, but which cancels the registration of the first incoming pulse if the second incoming pulse is not received in coincidence with the testing pulse. A received signal detected by a filter 2 is passed by demodulator 3 as a positive pulse to the grid 5 of a valve 6 and to the grid of a gas-discharge tube 4 which conducts and cuts off a normallyconducting valve 10. A capacitor 13 begins to charge and after a predetermined time interval a valve 14 conducts and initiates from the secondary winding 22 of a transformer 21 a positive pulse which is applied to the grid of a valve 33 and to the second grid 7 of the valve 6. A little later, due to the higher positive potential of its cathode, the valve 15 conducts and terminates the positive pulse applied to the valves 6, 33. If a second pulse is received via filter 2 and demodulator 3 during the positive pulse determined by the valves 14, 15 and transformer 21, the valve 6 conducts, operating relay 24 which locks up over contact 25 and starts the recorder. Additionally, a signal is sent to the transmitter to suppress the transmission of further start signals. The positive pulse fed from the secondary winding 22 makes valve 33 conducting, and if no further impulse is applied via filter 2 and demodulator 3, the valve 4 is cut off by the negative pulse applied to the plate 8 from the anode resistor 27 and the valve 10 becomes conducting so that the capacitor 13 is discharged and the valves 14, 15 become non- conducting. The arrangement may be extended to be responsive solely to three or more control pulses at predetermined intervals.
GB1289855A 1955-05-04 1955-05-04 Improvements in or relating to facsimile recording apparatus Expired GB769808A (en)

Priority Applications (6)

Application Number Priority Date Filing Date Title
NL104686D NL104686C (en) 1955-05-04
BE547499D BE547499A (en) 1955-05-04
GB1289855A GB769808A (en) 1955-05-04 1955-05-04 Improvements in or relating to facsimile recording apparatus
CH333038D CH333038A (en) 1955-05-04 1956-04-11 Facsimile recording device
FR1152714D FR1152714A (en) 1955-05-04 1956-05-03 Facsimile receiving device
DEC12968A DE1018453B (en) 1955-05-04 1956-05-04 Facsimile receiver with a narrow 1 kHz band filter to eliminate the influence of the line background noise on the start impulses and with a device to prevent false starts caused by interference impulses

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB1289855A GB769808A (en) 1955-05-04 1955-05-04 Improvements in or relating to facsimile recording apparatus

Publications (1)

Publication Number Publication Date
GB769808A true GB769808A (en) 1957-03-13

Family

ID=10013167

Family Applications (1)

Application Number Title Priority Date Filing Date
GB1289855A Expired GB769808A (en) 1955-05-04 1955-05-04 Improvements in or relating to facsimile recording apparatus

Country Status (6)

Country Link
BE (1) BE547499A (en)
CH (1) CH333038A (en)
DE (1) DE1018453B (en)
FR (1) FR1152714A (en)
GB (1) GB769808A (en)
NL (1) NL104686C (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1166250B (en) * 1958-03-14 1964-03-26 Creed & Co Ltd Call procedure for facsimile devices and circuitry for carrying out the procedure

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2556713A (en) * 1946-05-16 1951-06-12 Stewart Warner Corp Electronic control circuit

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1166250B (en) * 1958-03-14 1964-03-26 Creed & Co Ltd Call procedure for facsimile devices and circuitry for carrying out the procedure

Also Published As

Publication number Publication date
NL104686C (en)
CH333038A (en) 1958-09-30
DE1018453B (en) 1957-10-31
BE547499A (en)
FR1152714A (en) 1958-02-24

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