GB1238903A - - Google Patents

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Publication number
GB1238903A
GB1238903A GB1238903DA GB1238903A GB 1238903 A GB1238903 A GB 1238903A GB 1238903D A GB1238903D A GB 1238903DA GB 1238903 A GB1238903 A GB 1238903A
Authority
GB
United Kingdom
Prior art keywords
frequency
modulator
stage
divided
colour television
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
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 filed Critical
Publication of GB1238903A publication Critical patent/GB1238903A/en
Expired legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N9/00—Details of colour television systems
    • H04N9/44—Colour synchronisation
    • H04N9/45—Generation or recovery of colour sub-carriers

Landscapes

  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Color Television Systems (AREA)

Abstract

1,238,903. Colour television. PYE Ltd. 14 Aug., 1969 [28 Aug., 1968], No. 41054/68. Heading H4F. A master oscillator for use with a 625 line, 50 fields per second PAL colour television system in which the relationship F H =4/1135 (F sc - ¢F v ) is satisfied, comprises an oscillator 1, Fig. 2, having a sub-carrier frequency F sc , the output of which is applied to a modulator 2 to which is also applied a signal of frequency Fv/2 (see below). The output of modulator 2 is filtered 3 and the resulting difference frequency (F sc - ¢F v ) is multiplied by 2 and applied directly and via a divide by 5 stage 10 to the inputs of a second modulator 11 the difference output 8/5(F sc - ¢F v ) being filtered 12 and divided by 227 in stage 13 to derive frequency 2F H . This is divided by 2 to form line frequency f H and divided by 625 to derive field frequency # v . Frequency F v is divided by 2 in stage 8 and applied to modulator 2 are previously described. Frequencies F sc , 2F H , F H and F v are applied to a synchronizing pulse generator of a PAL colour television system. If the " - ¢F v " offset is not required, modulator 2, filter 3 and divider 8 are not required. In addition for a 525 line, 60 fields per second colour television system stage 13 divides by 91 and stage 7 by 525.
GB1238903D 1968-08-28 1968-08-28 Expired GB1238903A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB4105468 1968-08-28

Publications (1)

Publication Number Publication Date
GB1238903A true GB1238903A (en) 1971-07-14

Family

ID=10417891

Family Applications (1)

Application Number Title Priority Date Filing Date
GB1238903D Expired GB1238903A (en) 1968-08-28 1968-08-28

Country Status (1)

Country Link
GB (1) GB1238903A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0175434A2 (en) * 1984-04-27 1986-03-26 Ampex Corporation Apparatus for generating television synchronizing signals

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0175434A2 (en) * 1984-04-27 1986-03-26 Ampex Corporation Apparatus for generating television synchronizing signals
EP0175434A3 (en) * 1984-04-27 1988-09-28 Ampex Corporation Method and apparatus for generating television synchronizing signals

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Legal Events

Date Code Title Description
PS Patent sealed
PCNP Patent ceased through non-payment of renewal fee