FR2442561A1 - Level matching and luminance suppressing circuit for colour TV set - uses same reference voltage source for black level limiting and signal suppression during line flyback - Google Patents
Level matching and luminance suppressing circuit for colour TV set - uses same reference voltage source for black level limiting and signal suppression during line flybackInfo
- Publication number
- FR2442561A1 FR2442561A1 FR7832763A FR7832763A FR2442561A1 FR 2442561 A1 FR2442561 A1 FR 2442561A1 FR 7832763 A FR7832763 A FR 7832763A FR 7832763 A FR7832763 A FR 7832763A FR 2442561 A1 FR2442561 A1 FR 2442561A1
- Authority
- FR
- France
- Prior art keywords
- reference voltage
- level
- voltage source
- during line
- colour
- 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
- 230000001629 suppression Effects 0.000 title 1
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N5/00—Details of television systems
- H04N5/14—Picture signal circuitry for video frequency region
- H04N5/16—Circuitry for reinsertion of dc and slowly varying components of signal; Circuitry for preservation of black or white level
- H04N5/18—Circuitry for reinsertion of dc and slowly varying components of signal; Circuitry for preservation of black or white level by means of "clamp" circuit operated by switching circuit
- H04N5/185—Circuitry for reinsertion of dc and slowly varying components of signal; Circuitry for preservation of black or white level by means of "clamp" circuit operated by switching circuit for the black level
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N9/00—Details of colour television systems
- H04N9/64—Circuits for processing colour signals
Landscapes
- Engineering & Computer Science (AREA)
- Multimedia (AREA)
- Signal Processing (AREA)
- Picture Signal Circuits (AREA)
- Processing Of Color Television Signals (AREA)
Abstract
The circuit has an impedance-matching input stage, an inverting amplifier and an impedance-matching output stage. A level circuit holds the voltage of the black level to the level of a reference voltage. A suppressor suppresses the signal during line flyback. The level circuit and the suppressor use the same single reference voltage source. A sample comparator compares the output voltage from the circuit with the reference and its impedance is small during operation but high out of operation. During line flyback the impedance matching resistor of the luminance delay line is short circuited to protect it against interference.
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR7832763A FR2442561A1 (en) | 1978-11-21 | 1978-11-21 | Level matching and luminance suppressing circuit for colour TV set - uses same reference voltage source for black level limiting and signal suppression during line flyback |
DE19792946805 DE2946805A1 (en) | 1978-11-21 | 1979-11-20 | CIRCUIT ARRANGEMENT FOR LEVEL ADJUSTMENT AND SUPPRESSION OF THE LUMINAIRE SIGNALS IN A TELEVISION RECEIVER |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR7832763A FR2442561A1 (en) | 1978-11-21 | 1978-11-21 | Level matching and luminance suppressing circuit for colour TV set - uses same reference voltage source for black level limiting and signal suppression during line flyback |
Publications (2)
Publication Number | Publication Date |
---|---|
FR2442561A1 true FR2442561A1 (en) | 1980-06-20 |
FR2442561B1 FR2442561B1 (en) | 1981-05-29 |
Family
ID=9215117
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
FR7832763A Granted FR2442561A1 (en) | 1978-11-21 | 1978-11-21 | Level matching and luminance suppressing circuit for colour TV set - uses same reference voltage source for black level limiting and signal suppression during line flyback |
Country Status (2)
Country | Link |
---|---|
DE (1) | DE2946805A1 (en) |
FR (1) | FR2442561A1 (en) |
Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2875332A (en) * | 1953-12-01 | 1959-02-24 | Rca Corp | Stabilized clipper and clamp circuits |
Family Cites Families (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE2711913A1 (en) * | 1976-03-19 | 1977-09-22 | Rca Corp | System reference signal insertion circuit - applies to video signal with active and flyback intervals and uses two non:additive signal mixers (NL 21.9.77) |
-
1978
- 1978-11-21 FR FR7832763A patent/FR2442561A1/en active Granted
-
1979
- 1979-11-20 DE DE19792946805 patent/DE2946805A1/en not_active Withdrawn
Patent Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2875332A (en) * | 1953-12-01 | 1959-02-24 | Rca Corp | Stabilized clipper and clamp circuits |
Non-Patent Citations (1)
Title |
---|
EXBK/78 * |
Also Published As
Publication number | Publication date |
---|---|
FR2442561B1 (en) | 1981-05-29 |
DE2946805A1 (en) | 1980-05-22 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
ST | Notification of lapse |