GB1315456A - Television brightness control - Google Patents
Television brightness controlInfo
- Publication number
- GB1315456A GB1315456A GB1751771A GB1751771A GB1315456A GB 1315456 A GB1315456 A GB 1315456A GB 1751771 A GB1751771 A GB 1751771A GB 1751771 A GB1751771 A GB 1751771A GB 1315456 A GB1315456 A GB 1315456A
- Authority
- GB
- United Kingdom
- Prior art keywords
- terminal
- colour
- signal
- luminance signal
- clamped
- 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
- 239000003990 capacitor Substances 0.000 abstract 1
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N23/00—Cameras or camera modules comprising electronic image sensors; Control thereof
- H04N23/80—Camera processing pipelines; Components thereof
- H04N23/84—Camera processing pipelines; Components thereof for processing colour signals
- H04N23/87—Camera processing pipelines; Components thereof for processing colour signals for reinsertion of DC or slowly varying components of colour signals
Landscapes
- Engineering & Computer Science (AREA)
- Multimedia (AREA)
- Signal Processing (AREA)
- Processing Of Color Television Signals (AREA)
- Picture Signal Circuits (AREA)
- Television Receiver Circuits (AREA)
Abstract
1315456 Colour television receiver INTERNATIONAL STANDARD ELECTRIC CORP 27 May 1971 [20 June 1970] 17517/71 Heading H4F Brightness control in a colour television receiver is effected by clamping the luminance signal, before it is matrixed with a colour difference signal, with the aid of square pulses of adjustable magnitude. As shown, a (D.C. clamped) luminance signal is applied at terminal 1 and the square pulses are derived from the voltage at capacitor 16, the magnitude of which is controlled by potentiometer 17, when the diodes 8 and 15 are rendered conductive by horizontal flyback pulses applied to terminal 10. The resulting clamped luminance signal is then matrixed with a colour difference signal applied to terminal 11 to form a colour video signal which is passed to output 31 via a video amplifier 19-40. Alternatively the clamped luminance signal may be passed to output terminal 2. The video amplifier includes a trimmer resistor 28 to compensate for possible differences in the control-voltage requirements of the three guns in a colour display tube, and a trimmer resistor 34 which derives from the flyback pulses at terminal 40 a control signal for presetting the amplifier operating point so that it is not driven beyond its operating range by the maximum white level.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE2030500A DE2030500B2 (en) | 1970-06-20 | 1970-06-20 | Circuit arrangement for adjusting the brightness in color television receivers |
Publications (1)
Publication Number | Publication Date |
---|---|
GB1315456A true GB1315456A (en) | 1973-05-02 |
Family
ID=5774499
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB1751771A Expired GB1315456A (en) | 1970-06-20 | 1971-05-27 | Television brightness control |
Country Status (3)
Country | Link |
---|---|
DE (1) | DE2030500B2 (en) |
FR (1) | FR2095382B1 (en) |
GB (1) | GB1315456A (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0127439A1 (en) | 1983-05-31 | 1984-12-05 | Burle Technologies, Inc. | Brightness control network in a video signal processor |
Family Cites Families (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE1071756B (en) * | 1955-10-19 | 1959-12-24 | Radio Corporation Of America, New York, N. Y. (V. St. A.) | Color television receiver |
US3499104A (en) * | 1966-06-13 | 1970-03-03 | Rca Corp | Video output stage employing stacked high voltage and low voltage transistors |
-
1970
- 1970-06-20 DE DE2030500A patent/DE2030500B2/en not_active Ceased
-
1971
- 1971-05-27 GB GB1751771A patent/GB1315456A/en not_active Expired
- 1971-06-18 FR FR7122195A patent/FR2095382B1/fr not_active Expired
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0127439A1 (en) | 1983-05-31 | 1984-12-05 | Burle Technologies, Inc. | Brightness control network in a video signal processor |
US4598316A (en) * | 1983-05-31 | 1986-07-01 | Rca Corporation | Brightness control network in a video signal processor with AC coupled output stages |
EP0127439B2 (en) † | 1983-05-31 | 1993-03-10 | Burle Technologies, Inc. | Brightness control network in a video signal processor |
Also Published As
Publication number | Publication date |
---|---|
FR2095382A1 (en) | 1972-02-11 |
DE2030500B2 (en) | 1975-05-15 |
FR2095382B1 (en) | 1975-07-11 |
DE2030500A1 (en) | 1971-12-30 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
PS | Patent sealed [section 19, patents act 1949] | ||
435 | Patent endorsed 'licences of right' on the date specified (sect. 35/1949) | ||
PCNP | Patent ceased through non-payment of renewal fee |