GB1410984A - Decoding systems for colour television receivers - Google Patents

Decoding systems for colour television receivers

Info

Publication number
GB1410984A
GB1410984A GB5554972A GB5554972A GB1410984A GB 1410984 A GB1410984 A GB 1410984A GB 5554972 A GB5554972 A GB 5554972A GB 5554972 A GB5554972 A GB 5554972A GB 1410984 A GB1410984 A GB 1410984A
Authority
GB
United Kingdom
Prior art keywords
demodulators
chrominance signal
switch
phase
derived
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
GB5554972A
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.)
Sony Corp
Original Assignee
Sony 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 Sony Corp filed Critical Sony Corp
Publication of GB1410984A publication Critical patent/GB1410984A/en
Expired legal-status Critical Current

Links

Classifications

    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04NPICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N9/00Details of colour television systems
    • H04N9/44Colour synchronisation
    • H04N9/455Generation of colour burst signals; Insertion of colour burst signals in colour picture signals or separation of colour burst signals from colour picture signals

Landscapes

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

Abstract

1410984 Colour television SONY CORP 1 Dec 1972 [7 Dec 1971] 55549/72 Heading H4F A PAL colour television receiver uses a one (or three, or five ... ) line delay line 3 and a switch 2 operated at the end of each line period to produce a chrominance signal having the same modulation axes for all line periods, which chrominance signal is passed to demodulators 6, 7; the phase of operation of switch 2 is controlled so as to pass to the demodulators 6, 7 a chrominance signal having desired modulation axes (in the embodiment shown having the R-Y modulation axis at + 90 degrees relative to the B-Y modulation axis) by the use of further demodulators 13, 14 receiving the received chrominance signal from band-pass amplifier 1 and the delayed chrominance signal from delay line 3, respectively, which, in combination with adder 17, subtractor 20, envelope detectors 18, 21 and differential amplifier 19 produce an output from control circuit 22 if the phase of operation of switch 2 is wrong, thus producing a change in the state of a flip-flop 5 which controls switch 2. A subcarrier reference signal of phase equal to that of the bursts in the chrominance signal fed to demodulators 6,7 is produced by an oscillator 10, the correct reference signals for demodulators 6, 7 being produced by 45 degree phase retarder 11 and 90 degree phase retarder 12. The reference signals for demodulators 13, 14 are derived from 90 degrees phase retarders 15, 16. If the switch 2 is operating correctly, no output is derived from control circuit 22 and the operation of flip-flop 5 is not altered. Demodulators 13, 14 may be supplied with only the bursts contained in the chrominance signals derived from 1, 3 respectively, and these demodulators may be supplied with reference signals of other phases, e.g. phase retarder 15 may be omitted (Fig. 13, not shown). Demodulator 7 may receive the received chrominance signal from amplifier 1 rather than the chrominance signal from switch 2.
GB5554972A 1971-12-07 1972-12-01 Decoding systems for colour television receivers Expired GB1410984A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP46098825A JPS5235258B2 (en) 1971-12-07 1971-12-07

Publications (1)

Publication Number Publication Date
GB1410984A true GB1410984A (en) 1975-10-22

Family

ID=14230059

Family Applications (1)

Application Number Title Priority Date Filing Date
GB5554972A Expired GB1410984A (en) 1971-12-07 1972-12-01 Decoding systems for colour television receivers

Country Status (17)

Country Link
JP (1) JPS5235258B2 (en)
AT (1) AT323256B (en)
AU (1) AU473252B2 (en)
BE (1) BE792385A (en)
BR (1) BR7208641D0 (en)
CH (1) CH572300A5 (en)
DD (1) DD103781A5 (en)
DE (1) DE2259928C3 (en)
DK (1) DK145900C (en)
ES (1) ES409441A1 (en)
FI (1) FI55741C (en)
GB (1) GB1410984A (en)
IT (1) IT971667B (en)
NL (1) NL7216656A (en)
NO (1) NO140037C (en)
SE (1) SE376708B (en)
ZA (1) ZA728552B (en)

Also Published As

Publication number Publication date
DK145900B (en) 1983-04-05
NO140037C (en) 1979-06-20
ES409441A1 (en) 1975-12-16
JPS4863633A (en) 1973-09-04
DE2259928C3 (en) 1979-07-19
ZA728552B (en) 1973-08-29
FI55741C (en) 1979-09-10
AU4978472A (en) 1974-06-13
DD103781A5 (en) 1974-02-05
DE2259928B2 (en) 1978-10-19
NL7216656A (en) 1973-06-12
SE376708B (en) 1975-06-02
DE2259928A1 (en) 1973-06-14
JPS5235258B2 (en) 1977-09-08
IT971667B (en) 1974-05-10
AU473252B2 (en) 1976-06-17
AT323256B (en) 1975-07-10
FI55741B (en) 1979-05-31
NO140037B (en) 1979-03-12
BR7208641D0 (en) 1974-12-31
CH572300A5 (en) 1976-01-30
BE792385A (en) 1973-03-30
DK145900C (en) 1983-09-12

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Legal Events

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