GB2011742A - Television horizontal oscillator frequency control arrangement - Google Patents

Television horizontal oscillator frequency control arrangement

Info

Publication number
GB2011742A
GB2011742A GB7848560A GB7848560A GB2011742A GB 2011742 A GB2011742 A GB 2011742A GB 7848560 A GB7848560 A GB 7848560A GB 7848560 A GB7848560 A GB 7848560A GB 2011742 A GB2011742 A GB 2011742A
Authority
GB
United Kingdom
Prior art keywords
phase
horizontal oscillator
video
liable
unwanted
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.)
Granted
Application number
GB7848560A
Other versions
GB2011742B (en
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.)
RCA Corp
Original Assignee
RCA 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
Priority claimed from US05/862,177 external-priority patent/US4144544A/en
Priority claimed from US05/862,179 external-priority patent/US4144545A/en
Application filed by RCA Corp filed Critical RCA Corp
Publication of GB2011742A publication Critical patent/GB2011742A/en
Application granted granted Critical
Publication of GB2011742B publication Critical patent/GB2011742B/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
    • H04N5/05—Synchronising circuits with arrangements for extending range of synchronisation, e.g. by using switching between several time constants

Landscapes

  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Synchronizing For Television (AREA)
  • Television Signal Processing For Recording (AREA)
  • Details Of Television Scanning (AREA)

Abstract

A television receiver used in conjunction with a video tape recorder is liable to receive a step change in phase of the horizontal synchronizing pulse occurring prior to the vertical blanking signal and this can produce a distorted video display. The unwanted video distortion results from too slow slewing of the horizontal oscillator phase-locked loop to the new phase. By the invention, to reduce the video distortion, the low- pass filter 40 in a phase locked loop including a phase comparator 20, a horizontal oscillator 50, deflection circuit 52 and integrater 56 is switched to a high gain condition at a time before the end of the vertical scanning interval. Such switching can be accomplished by a monostable multi-vibrator 71, 72 or a threshold arrangement (Figure 3). The invention is not prejudicial and does not require any switching out of the inventive components, when line pulses not liable to said unwanted phase discontinuities are being received, e.g. from conventional received transmissions. <IMAGE>
GB7848560A 1977-12-19 1978-12-14 Television horizontal oscillator frequency control arrangement Expired GB2011742B (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US05/862,177 US4144544A (en) 1977-12-19 1977-12-19 Television horizontal oscillator frequency control arrangement for use with tape recorder
US05/862,179 US4144545A (en) 1977-12-19 1977-12-19 Television horizontal oscillator frequency control arrangement for use with a tape recorder

Publications (2)

Publication Number Publication Date
GB2011742A true GB2011742A (en) 1979-07-11
GB2011742B GB2011742B (en) 1982-05-12

Family

ID=27127677

Family Applications (1)

Application Number Title Priority Date Filing Date
GB7848560A Expired GB2011742B (en) 1977-12-19 1978-12-14 Television horizontal oscillator frequency control arrangement

Country Status (5)

Country Link
JP (1) JPS5491021A (en)
DE (1) DE2854828A1 (en)
FR (1) FR2412213A1 (en)
GB (1) GB2011742B (en)
MY (1) MY8500777A (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4301258C1 (en) * 1993-01-19 1994-03-10 Siemens Ag Video signal processing circuit for TV receiver or video recorder - uses line synchronisation component and image synchronised vertical pulses to identify video signal source

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3740489A (en) * 1969-06-11 1973-06-19 Rca Corp Horizontal oscillator control for plural operating mode television receivers
JPS55944B2 (en) * 1972-03-03 1980-01-10
JPS5242492B2 (en) * 1972-10-09 1977-10-25
JPS49110218A (en) * 1973-02-20 1974-10-21

Also Published As

Publication number Publication date
DE2854828A1 (en) 1979-06-21
GB2011742B (en) 1982-05-12
JPS5491021A (en) 1979-07-19
JPS6227589B2 (en) 1987-06-16
FR2412213A1 (en) 1979-07-13
FR2412213B1 (en) 1984-03-16
DE2854828C2 (en) 1988-12-29
MY8500777A (en) 1985-12-31

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Legal Events

Date Code Title Description
732 Registration of transactions, instruments or events in the register (sect. 32/1977)
PE20 Patent expired after termination of 20 years

Effective date: 19981213