FR2271729A1 - Sub carrier generator for SECAM TV system - has two quartz oscillators with phase control switched between reference and line suppression - Google Patents

Sub carrier generator for SECAM TV system - has two quartz oscillators with phase control switched between reference and line suppression

Info

Publication number
FR2271729A1
FR2271729A1 FR7416629A FR7416629A FR2271729A1 FR 2271729 A1 FR2271729 A1 FR 2271729A1 FR 7416629 A FR7416629 A FR 7416629A FR 7416629 A FR7416629 A FR 7416629A FR 2271729 A1 FR2271729 A1 FR 2271729A1
Authority
FR
France
Prior art keywords
sub
line frequency
phase
secam
carrier generator
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.)
Withdrawn
Application number
FR7416629A
Other languages
French (fr)
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.)
CURELLY LOUIS FR
Original Assignee
CURELLY LOUIS FR
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 CURELLY LOUIS FR filed Critical CURELLY LOUIS FR
Priority to FR7416629A priority Critical patent/FR2271729A1/en
Publication of FR2271729A1 publication Critical patent/FR2271729A1/en
Withdrawn legal-status Critical Current

Links

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)
  • Processing Of Color Television Signals (AREA)

Abstract

The SECAM colour television system uses two sub carriers in phase with the line frequency. Separate quartz oscillators for the sub carriers overcome filtering problems when using the line frequency for sub-carrier generation. Two quartz crystal oscillators for the blue and red sub-carriers are connected through a switch operating at line frequency to a phase comparator and NOR gate which receives squared signals from a limiter. The NOR gate also receives pulses referenced to line frequency. A monostable generates a pulse which is applied to a modulated chrominance sub carrier generator to keep it in phase with the reference signal. The output is connected to the comparator and to a television signal coding circuit and the comparator output connects to the modulator through a time controlled switch.
FR7416629A 1974-05-14 1974-05-14 Sub carrier generator for SECAM TV system - has two quartz oscillators with phase control switched between reference and line suppression Withdrawn FR2271729A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
FR7416629A FR2271729A1 (en) 1974-05-14 1974-05-14 Sub carrier generator for SECAM TV system - has two quartz oscillators with phase control switched between reference and line suppression

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR7416629A FR2271729A1 (en) 1974-05-14 1974-05-14 Sub carrier generator for SECAM TV system - has two quartz oscillators with phase control switched between reference and line suppression

Publications (1)

Publication Number Publication Date
FR2271729A1 true FR2271729A1 (en) 1975-12-12

Family

ID=9138803

Family Applications (1)

Application Number Title Priority Date Filing Date
FR7416629A Withdrawn FR2271729A1 (en) 1974-05-14 1974-05-14 Sub carrier generator for SECAM TV system - has two quartz oscillators with phase control switched between reference and line suppression

Country Status (1)

Country Link
FR (1) FR2271729A1 (en)

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Legal Events

Date Code Title Description
TP Transmission of property
ST Notification of lapse