GB538587A - Improvements in television synchronizing-signal separators - Google Patents

Improvements in television synchronizing-signal separators

Info

Publication number
GB538587A
GB538587A GB1071/41A GB107141A GB538587A GB 538587 A GB538587 A GB 538587A GB 1071/41 A GB1071/41 A GB 1071/41A GB 107141 A GB107141 A GB 107141A GB 538587 A GB538587 A GB 538587A
Authority
GB
United Kingdom
Prior art keywords
oscillations
peaks
pulses
valve
synchronizing
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
GB1071/41A
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.)
BAE Systems Aerospace Inc
Original Assignee
Hazeltine 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 Hazeltine Corp filed Critical Hazeltine Corp
Publication of GB538587A publication Critical patent/GB538587A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N5/00—Details of television systems
    • H04N5/04—Synchronising
    • H04N5/08—Separation of synchronising signals from picture signals
    • H04N5/10—Separation of line synchronising signal from frame synchronising signal or vice versa

Landscapes

  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Television Systems (AREA)
  • Investigating Or Analyzing Materials By The Use Of Ultrasonic Waves (AREA)
  • Image Analysis (AREA)
  • Synchronizing For Television (AREA)

Abstract

538,587. Television. HAZELTINE CORPORATION. Feb. 19, 1940, No. 1071/41. Convention date, March 16, 1939. Divided out of 537,878. [Classes 40 (iii) and 40 (v)] Synchronizing pulses of received television signals are obtained free from random pulses by means of a circuit including first a limiter 22, Fig. 1, to cut off the peaks of the random pulses, then a " line frequency modifier " 23 comprising a valve oscillator 40, Fig. 2a, having a resonant circuit 43 producing oscillations in synchronism with the synchronizing pulses, and a combining and limiting valve 24 in which the synchronizing signal is added to the oscillations generated by the valve 40, the synchronizing pulses being added to the peaks of the oscillations while random pulses are scattered down the valleys of the oscillations, the limiting action of the valve causing only the synchronizing pulses on the peaks to be passed to the " line-frequency generator " 25. In a modification, Fig. 3a (not shown) a multiple resonant circuit is provided to generate oscillations including harmonics and therefor having sharper peaks. In another modification, only the peaks of the generated oscillations are transmitted. Specifications 530,956 and 537,878 are referred to.
GB1071/41A 1939-03-16 1940-02-19 Improvements in television synchronizing-signal separators Expired GB538587A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US262146A US2416424A (en) 1939-03-16 1939-03-16 Synchronizing-signal separator

Publications (1)

Publication Number Publication Date
GB538587A true GB538587A (en) 1941-08-08

Family

ID=22996341

Family Applications (2)

Application Number Title Priority Date Filing Date
GB3138/40A Expired GB537878A (en) 1939-03-16 1940-02-19 Improvements in television synchronizing-signal separators
GB1071/41A Expired GB538587A (en) 1939-03-16 1940-02-19 Improvements in television synchronizing-signal separators

Family Applications Before (1)

Application Number Title Priority Date Filing Date
GB3138/40A Expired GB537878A (en) 1939-03-16 1940-02-19 Improvements in television synchronizing-signal separators

Country Status (3)

Country Link
US (1) US2416424A (en)
FR (1) FR867264A (en)
GB (2) GB537878A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2763718A (en) * 1951-11-30 1956-09-18 Bell Telephone Labor Inc Field synchronizing pulse selector

Families Citing this family (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2629049A (en) * 1942-03-02 1953-02-17 John M Miller Filter
US2493517A (en) * 1942-07-24 1950-01-03 Jr Alexander R Applegarth Blocking oscillator
US2580213A (en) * 1945-04-18 1951-12-25 Bess Leon Pulse discrimination circuit responsive to double sets of pulses
GB621494A (en) * 1946-01-08 1949-04-11 Dennis Illingworth Lawson Improvements in or relating to television receivers
US2570805A (en) * 1946-07-20 1951-10-09 Hazeltine Research Inc Signal-translating system
US2574229A (en) * 1947-11-14 1951-11-06 Motorola Inc Flywheel synchronization system
US2539465A (en) * 1947-12-01 1951-01-30 Int Standard Electric Corp Television pulse and sound separator
US2703364A (en) * 1948-10-18 1955-03-01 Birnbaum Milton Filter system
US2586760A (en) * 1948-12-01 1952-02-19 Rca Corp Combined amplitude and frequency discriminatory automatic gain control
DE939698C (en) * 1951-11-15 1956-03-01 Lorenz C Ag Method and circuit arrangement for the selective separation of the vertical synchronization pulses from the received television synchronization pulse mixture
BE515536A (en) * 1951-11-15
US2838605A (en) * 1952-10-27 1958-06-10 Itt Stabilized synchronizing system
FR1108134A (en) * 1954-05-28 1956-01-09 Csf Method and device for improving the transmission of radio signals in the presence of noise
GB783124A (en) * 1955-04-25 1957-09-18 Marconi Wireless Telegraph Co Improvements in or relating to electron discharge device circuit arrangements
NZ140979A (en) * 1963-12-06

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2137798A (en) * 1933-07-19 1938-11-22 Emi Ltd Television and the like transmission system
US2141343A (en) * 1935-06-07 1938-12-27 Philco Radio & Television Corp Electrical system
DE1033257B (en) * 1936-09-05 1958-07-03 Loewe Opta Ag Method for mixing picture change and line pulses in television
GB491728A (en) * 1937-03-10 1938-09-08 Eric Lawrence Casling White Improvements in or relating to circuit arrangements for separating electric signal pulses
US2175270A (en) * 1937-03-31 1939-10-10 Rca Corp Reduction of noise
GB514271A (en) * 1938-04-29 1939-11-03 Baird Television Ltd Improvements in or relating to television and like receivers

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2763718A (en) * 1951-11-30 1956-09-18 Bell Telephone Labor Inc Field synchronizing pulse selector

Also Published As

Publication number Publication date
US2416424A (en) 1947-02-25
FR867264A (en) 1941-10-10
GB537878A (en) 1941-07-10

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