GB1490205A - Colour television decoder - Google Patents
Colour television decoderInfo
- Publication number
- GB1490205A GB1490205A GB4472574A GB4472574A GB1490205A GB 1490205 A GB1490205 A GB 1490205A GB 4472574 A GB4472574 A GB 4472574A GB 4472574 A GB4472574 A GB 4472574A GB 1490205 A GB1490205 A GB 1490205A
- Authority
- GB
- United Kingdom
- Prior art keywords
- circuit
- output
- phase
- generator
- line
- 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)
Abstract
1490205 Colour television INDESIT INDUSTRIA ELETTRODOMESTICI ITALIANA SpA 15 Oct 1974 [22 Oct 1973] 44725/74 Heading H4F The phase of the reference subcarrier oscillator 10 in a PAL colour television receiver is controlled by controlling a phase shift circuit 8 connected between a burst gate 2 and oscillator 10, such control being carried out in response to a signal derived from the output of at least one of the demodulators 3, 4. Burst gate 2 is opened to pass only every second colour burst and is controlled by a circuit 6 receiving line repetition frequency pulses 5 and a signal from a half-line-frequency generator 7 which also controls a PAL switch 13. The output of B-Y demodulator 3 is fed via a half-line-frequency selective circuit 17 to a circuit 18 which provides the control signal for phase shift circuit 8 and resets generator 7 if it is operating in incorrect phase. Circuit 18 may also receive a second input from a second half-line-frequency selective circuit 17<SP>1</SP> connected to the output of R-Y demodulator 4. The circuit 18 includes two peak detectors (21, 22, Fig. 2, not shown) connected with reversed polarity to the output of frequency selective circuit 17; if circuit 17<SP>1</SP> is included it is connected to two similar peak detectors (21<SP>1</SP>, 22<SP>1</SP>), the outputs of corresponding peak detectors (e.g. 21, 21<SP>1</SP>) being added together. The output of one peak detector (or the corresponding adder) controls two threshold circuits (25, 26) one of which (25) has a higher threshold and shorter time constant than the other and supplies the resetting signal to generator 7 if the generator 7 is operating in the incorrect phase ; such incorrect phase results in the burst gate 2 separating the wrong bursts and oscillator 10 operating at 90 degrees to the correct phase. The second threshold circuit (26) controls a change-over switch (27) to supply the output of one of the peak detectors (or the corresponding adder) to control phase shift circuit 8.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| IT7009173A IT996856B (en) | 1973-10-22 | 1973-10-22 | COLOR TELEVISION DECODER |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB1490205A true GB1490205A (en) | 1977-10-26 |
Family
ID=11313421
Family Applications (2)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB4472574A Expired GB1490205A (en) | 1973-10-22 | 1974-10-15 | Colour television decoder |
| GB2601277A Expired GB1490968A (en) | 1973-10-22 | 1974-10-15 | Colour television decoder |
Family Applications After (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB2601277A Expired GB1490968A (en) | 1973-10-22 | 1974-10-15 | Colour television decoder |
Country Status (4)
| Country | Link |
|---|---|
| DE (1) | DE2450041A1 (en) |
| GB (2) | GB1490205A (en) |
| IT (1) | IT996856B (en) |
| NL (1) | NL7413553A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2393061A (en) * | 2002-09-12 | 2004-03-17 | Snell & Wilcox Ltd | Composite video signal decoding |
-
1973
- 1973-10-22 IT IT7009173A patent/IT996856B/en active
-
1974
- 1974-10-15 GB GB4472574A patent/GB1490205A/en not_active Expired
- 1974-10-15 GB GB2601277A patent/GB1490968A/en not_active Expired
- 1974-10-15 NL NL7413553A patent/NL7413553A/en not_active Application Discontinuation
- 1974-10-22 DE DE19742450041 patent/DE2450041A1/en not_active Withdrawn
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2393061A (en) * | 2002-09-12 | 2004-03-17 | Snell & Wilcox Ltd | Composite video signal decoding |
| GB2393061B (en) * | 2002-09-12 | 2006-08-02 | Snell & Wilcox Limited | Composite decoding |
Also Published As
| Publication number | Publication date |
|---|---|
| GB1490968A (en) | 1977-11-09 |
| IT996856B (en) | 1975-12-10 |
| DE2450041A1 (en) | 1975-04-24 |
| NL7413553A (en) | 1975-04-24 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| GB1386235A (en) | Pal chroma processor | |
| GB1390075A (en) | Colour television display apparatus | |
| GB1490205A (en) | Colour television decoder | |
| US4096515A (en) | VIR Automatic hue control with preference capability | |
| GB1076890A (en) | Improvements in colour television receivers | |
| ES372162A1 (en) | Identification circuit for pal color television receiver | |
| GB1385795A (en) | Colour television receiver for use in pal system | |
| GB1488830A (en) | Circuit arrangement for processing a chrominance signal | |
| JPS5730486A (en) | Chrominance demodulator | |
| JPS5542482A (en) | Color signal circuit of pal color television receiver | |
| GB1490725A (en) | Demodulation circuit for colour television signals | |
| GB1357174A (en) | Colour television receivers | |
| GB1336920A (en) | Decoding systems for colour television receivers | |
| GB1496495A (en) | Processing circuit for television chromatic signals | |
| SU371856A1 (en) | DECODING DEVICE FOR SECURITY COLOR-TELEVISION RECEIVER SYSTEM | |
| JPS56141682A (en) | Color demodulation equipment | |
| GB1486914A (en) | Colour television system | |
| GB1490354A (en) | Processing circuit for chromatic television signals | |
| GB1492567A (en) | Processing circuit for television chromatic signals | |
| GB1293958A (en) | Improvements relating to colour television receivers | |
| SU944161A1 (en) | Secam-pal system decoding device | |
| GB1459855A (en) | Video transmitter stabilization system | |
| GB1076735A (en) | Improvements in or relating to decoder circuit arrangements for colour television receivers | |
| GB1508031A (en) | Circuit arrangement for the processing of chromatic television signals | |
| GB1521296A (en) | Circuit arrangements for demodulating chrominance television signals |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PS | Patent sealed | ||
| PCNP | Patent ceased through non-payment of renewal fee |