GB1410984A - Decoding systems for colour television receivers - Google Patents
Decoding systems for colour television receiversInfo
- 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
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
- H04N9/455—Generation 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.
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) |
-
0
- BE BE792385D patent/BE792385A/en not_active IP Right Cessation
-
1971
- 1971-12-07 JP JP46098825A patent/JPS5235258B2/ja not_active Expired
-
1972
- 1972-12-01 GB GB5554972A patent/GB1410984A/en not_active Expired
- 1972-12-04 ZA ZA728552A patent/ZA728552B/en unknown
- 1972-12-05 FI FI3450/72A patent/FI55741C/en active
- 1972-12-06 NO NO4483/72A patent/NO140037C/en unknown
- 1972-12-06 AT AT1039372A patent/AT323256B/en not_active IP Right Cessation
- 1972-12-06 CH CH1774172A patent/CH572300A5/xx not_active IP Right Cessation
- 1972-12-06 DK DK608372A patent/DK145900C/en not_active IP Right Cessation
- 1972-12-06 SE SE7215890A patent/SE376708B/xx unknown
- 1972-12-06 DD DD168176*A patent/DD103781A5/xx unknown
- 1972-12-07 ES ES409441A patent/ES409441A1/en not_active Expired
- 1972-12-07 IT IT32650/72A patent/IT971667B/en active
- 1972-12-07 AU AU49784/72A patent/AU473252B2/en not_active Ceased
- 1972-12-07 DE DE2259928A patent/DE2259928C3/en not_active Expired
- 1972-12-07 BR BR8641/72A patent/BR7208641D0/en unknown
- 1972-12-07 NL NL7216656A patent/NL7216656A/xx unknown
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 |