GB1049507A - Improvements in or relating to the locking together of periodic signals - Google Patents

Improvements in or relating to the locking together of periodic signals

Info

Publication number
GB1049507A
GB1049507A GB970264A GB970264A GB1049507A GB 1049507 A GB1049507 A GB 1049507A GB 970264 A GB970264 A GB 970264A GB 970264 A GB970264 A GB 970264A GB 1049507 A GB1049507 A GB 1049507A
Authority
GB
United Kingdom
Prior art keywords
field pulses
switch
frequency
field
input
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
GB970264A
Inventor
Frank Alan Bellis
Eric Raymond Rout
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.)
British Broadcasting Corp
Original Assignee
British Broadcasting 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 British Broadcasting Corp filed Critical British Broadcasting Corp
Priority to GB970264A priority Critical patent/GB1049507A/en
Publication of GB1049507A publication Critical patent/GB1049507A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N7/00—Television systems
    • H04N7/01—Conversion of standards, e.g. involving analogue television standards or digital television standards processed at pixel level
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N5/00—Details of television systems
    • H04N5/04—Synchronising
    • H04N5/06—Generation of synchronising signals
    • H04N5/067—Arrangements or circuits at the transmitter end
    • H04N5/073—Arrangements or circuits at the transmitter end for mutually locking plural sources of synchronising signals, e.g. studios or relay stations

Abstract

1,049,507. Automatic phase-control systems; television. BRITISH BROADCASTING CORPORATION. April 1, 1965 [March 6, 1964], No. 9702/64. Headings H3A and H4F. In a television standards converter an oscillator 15 operating at the L.C.M. (or a multiple thereof) of the two line frequencies is controlled by the generator 10 of the first line frequency through a frequency divider 16 and phase comparator 14, and feeds a second divider 17 producing an output at the second line frequency (or preferably double this frequency) controlling the generator 11 for the second line and field pulses. The divider 17 is coupled to a count-slip gate 19 which, when energized, alters the division ratio, and this is used to synchronize the field pulses of the two systems. The gate 19 is controlled by a bistable switch 20 provided with the first field pulses as one input. A second input to switch 20 may be the second field pulses (switch 21 in position A) so that switch 20 is turned on by the first field pulses and off by the second field pulses. In this case the rate of approach of the field pulses is approximately exponential. More rapid synchronization may be achieved by providing the second input to switch 20 from a coincidence gate 24 which is fed with the second field pulses and with the first field pulses broadened in unit 25 to a value slightly greater than the minimum time interval by which the field pulses can be moved towards each other in one field period.
GB970264A 1964-03-06 1964-03-06 Improvements in or relating to the locking together of periodic signals Expired GB1049507A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB970264A GB1049507A (en) 1964-03-06 1964-03-06 Improvements in or relating to the locking together of periodic signals

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB970264A GB1049507A (en) 1964-03-06 1964-03-06 Improvements in or relating to the locking together of periodic signals

Publications (1)

Publication Number Publication Date
GB1049507A true GB1049507A (en) 1966-11-30

Family

ID=9877110

Family Applications (1)

Application Number Title Priority Date Filing Date
GB970264A Expired GB1049507A (en) 1964-03-06 1964-03-06 Improvements in or relating to the locking together of periodic signals

Country Status (1)

Country Link
GB (1) GB1049507A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0016922A1 (en) * 1979-03-16 1980-10-15 Siemens-Albis Aktiengesellschaft Circuit for synchronizing video pulse oscillators

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0016922A1 (en) * 1979-03-16 1980-10-15 Siemens-Albis Aktiengesellschaft Circuit for synchronizing video pulse oscillators

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