GB2018087A - Processing circuit for colour television signals - Google Patents
Processing circuit for colour television signalsInfo
- Publication number
- GB2018087A GB2018087A GB7909914A GB7909914A GB2018087A GB 2018087 A GB2018087 A GB 2018087A GB 7909914 A GB7909914 A GB 7909914A GB 7909914 A GB7909914 A GB 7909914A GB 2018087 A GB2018087 A GB 2018087A
- Authority
- GB
- United Kingdom
- Prior art keywords
- output
- signal
- subtractor
- line
- input signal
- 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.)
- Granted
Links
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N9/00—Details of colour television systems
- H04N9/77—Circuits for processing the brightness signal and the chrominance signal relative to each other, e.g. adjusting the phase of the brightness signal relative to the colour signal, correcting differential gain or differential phase
- H04N9/78—Circuits for processing the brightness signal and the chrominance signal relative to each other, e.g. adjusting the phase of the brightness signal relative to the colour signal, correcting differential gain or differential phase for separating the brightness signal or the chrominance signal from the colour television signal, e.g. using comb filter
Landscapes
- Engineering & Computer Science (AREA)
- Multimedia (AREA)
- Signal Processing (AREA)
- Processing Of Color Television Signals (AREA)
Abstract
A signal processing circuit (10) for colour television signals, e.g. PAL signals, has first and second one-line delays (14, 16) connected in series to the input (12), an averager (18) connected across the two delays and a subtractor (20) connected to subtract the averager output from the output of the first delay (14). In this way the circuit provides (i) a first signal at the output of the first delay (14) which is the input signal delayed by one line period and (ii) a second signal at the output of the subtractor (20) which is the resultant of the average of the undelayed input signal and the input signal delayed by two line periods subtracted from the input signal. A band-pass filter (22) covering the chrominance band is connected to the output of the subtractor (20). A second subtractor (24) subtracts the filtered signal from the one-line delayed signal. Separated luminance and chrominance are obtained at the outputs of the second subtractor (24) and the filter (22) respectively, which are especially suitable for digital use with line-locked sampling frequencies. Either output may be used on its own. Not N.T.S.C. signals, a divide-by-two circuit is included in series with the band-pass filter (22). <IMAGE>
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB7909914A GB2018087B (en) | 1978-03-29 | 1979-03-21 | Processing circuit for colour television signals |
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB1229478 | 1978-03-29 | ||
| GB7909914A GB2018087B (en) | 1978-03-29 | 1979-03-21 | Processing circuit for colour television signals |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| GB2018087A true GB2018087A (en) | 1979-10-10 |
| GB2018087B GB2018087B (en) | 1982-10-27 |
Family
ID=26248918
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB7909914A Expired GB2018087B (en) | 1978-03-29 | 1979-03-21 | Processing circuit for colour television signals |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB2018087B (en) |
-
1979
- 1979-03-21 GB GB7909914A patent/GB2018087B/en not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| GB2018087B (en) | 1982-10-27 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PE20 | Patent expired after termination of 20 years |
Effective date: 19990320 |