GB1535721A - Television systems - Google Patents
Television systemsInfo
- Publication number
- GB1535721A GB1535721A GB3161174A GB3161174A GB1535721A GB 1535721 A GB1535721 A GB 1535721A GB 3161174 A GB3161174 A GB 3161174A GB 3161174 A GB3161174 A GB 3161174A GB 1535721 A GB1535721 A GB 1535721A
- Authority
- GB
- United Kingdom
- Prior art keywords
- array
- samples
- component
- chrominance
- luminance
- 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
- H04N9/77—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
1535721 Television systems INDEPENDENT BROADCASTING AUTHORITY 1 Dec 1975 [31 Aug 1974] 31611/74 Heading H4F A digital video signal consisting of digital samples at intervals t is processed to provide a signal substantially free from the luminance component, or alternatively from the chrominance component, by an arrangement which includes a delay unit comprising a number of delays. At each interval t the delay unit provides simultaneously those samples which correspond to a rectangular array of picture points, the height of the array extending over at least two successive lines of the image represented by the video signal. These samples are weighted in multipliers and the weighted samples are summed. The weighting applied is such that, in the case of an array of points of uniform luminance, the chrominance component of the sum of the weighted samples is zero. Alternatively, in the case of an array of uniform chrominance, the weighting is such that the luminance component of the sum is zero. The delay unit may comprise 14 delays (Fig. 2a, not shown) to provide 15 simultaneous samples corresponding to an array 5 points wide by 3 lines high. The weighting values applied to the array are preferably symmetrical about the centre column and row of the array (e.g. as in Table 1 or Table 2, not shown), and the respective sums of the values in the other rows and columns are zero. If the array of weighting values is symmetrical some of the delays in the delay unit may be omitted, Fig. 2b (not shown). If the array of weighting values for extraction of the luminance component differs from that for the chrominance component respective multiplying and summing circuits must be used. However, if the arrays are the same, except for the centre value, a single such circuit may be used, the circuit being modified by the addition of a further multiplier and a subtractor to provide the components on respective outputs, Fig. 8 (not shown). Since the array of picture points may not have uniform chrominance or luminance the extracted components may not be entirely free of the other component, but the effect is stated to be of no significance. As disclosed the chrominance component is fed to I and Q demodulators whose outputs, together with components of the luminance component on three 120 degree axes, are time divisional multiplexed, Figs. 1 and 7 (not shown). The multiplexed signal may be added to another such signal to form a composite picture signal, or to signals derived from a set of lines of the picture via multipliers and an interpolator for the purposes of standards conversion.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB3161174A GB1535721A (en) | 1975-12-01 | 1975-12-01 | Television systems |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB3161174A GB1535721A (en) | 1975-12-01 | 1975-12-01 | Television systems |
Publications (1)
Publication Number | Publication Date |
---|---|
GB1535721A true GB1535721A (en) | 1978-12-13 |
Family
ID=10325745
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB3161174A Expired GB1535721A (en) | 1975-12-01 | 1975-12-01 | Television systems |
Country Status (1)
Country | Link |
---|---|
GB (1) | GB1535721A (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2516333A1 (en) * | 1981-11-09 | 1983-05-13 | Rca Corp | SYSTEM FOR PROCESSING DIGITAL TELEVISION SIGNALS |
-
1975
- 1975-12-01 GB GB3161174A patent/GB1535721A/en not_active Expired
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2516333A1 (en) * | 1981-11-09 | 1983-05-13 | Rca Corp | SYSTEM FOR PROCESSING DIGITAL TELEVISION SIGNALS |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
PS | Patent sealed | ||
PCNP | Patent ceased through non-payment of renewal fee |