FR2433869A1 - Circuit de synchronisation et de reglage de gain - Google Patents
Circuit de synchronisation et de reglage de gainInfo
- Publication number
- FR2433869A1 FR2433869A1 FR7920894A FR7920894A FR2433869A1 FR 2433869 A1 FR2433869 A1 FR 2433869A1 FR 7920894 A FR7920894 A FR 7920894A FR 7920894 A FR7920894 A FR 7920894A FR 2433869 A1 FR2433869 A1 FR 2433869A1
- Authority
- FR
- France
- Prior art keywords
- signal
- noise
- coupled
- sync signal
- video 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
- H04N5/00—Details of television systems
- H04N5/14—Picture signal circuitry for video frequency region
- H04N5/21—Circuitry for suppressing or minimising disturbance, e.g. moiré or halo
- H04N5/213—Circuitry for suppressing or minimising impulsive noise
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N5/00—Details of television systems
- H04N5/44—Receiver circuitry for the reception of television signals according to analogue transmission standards
- H04N5/52—Automatic gain control
- H04N5/53—Keyed automatic gain control
Landscapes
- Engineering & Computer Science (AREA)
- Multimedia (AREA)
- Signal Processing (AREA)
- Synchronizing For Television (AREA)
- Television Receiver Circuits (AREA)
- Control Of Amplification And Gain Control (AREA)
Abstract
L'invention concerne un circuit pour produire un signal de synchronisation de télévision et un signal de réglage automatique de gain. Selon l'invention, un signal vidéo composé est couplé à l'entrée d'un inverseur de bruit à seuil en courant continu 30 qui inverse le bruit impulsionnel au-dessus d'un niveau de seuil prédéterminés; le signal de bruit inversé et un signal vidéo retardé en 50 sont couplés à un séparateur de signaux de synchronisation 40 détectant en crête, qui génère un signal de synchronisation sans bruit; le signal de synchronisation sans bruit est couplé à un circuit de blocage 70, où il est combiné à un signal de retour horizontal pour produire un signal de verrouillage de réglage automatique de gain à partir du signal vidéo composé. L'invention s'applique notamment aux téléviseurs.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US05/934,822 US4212032A (en) | 1978-08-18 | 1978-08-18 | Synchronization and gain control circuit |
Publications (2)
Publication Number | Publication Date |
---|---|
FR2433869A1 true FR2433869A1 (fr) | 1980-03-14 |
FR2433869B1 FR2433869B1 (fr) | 1984-12-14 |
Family
ID=25466118
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
FR7920894A Granted FR2433869A1 (fr) | 1978-08-18 | 1979-08-17 | Circuit de synchronisation et de reglage de gain |
Country Status (6)
Country | Link |
---|---|
US (1) | US4212032A (fr) |
JP (1) | JPS5840389B2 (fr) |
CA (1) | CA1130914A (fr) |
DE (1) | DE2933472C2 (fr) |
FR (1) | FR2433869A1 (fr) |
GB (1) | GB2028613B (fr) |
Families Citing this family (12)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB2053599B (en) * | 1979-06-22 | 1984-03-07 | Matsushita Electric Ind Co Ltd | Automatic gain control circuit |
JPS57142088A (en) * | 1981-02-27 | 1982-09-02 | Sanyo Electric Co Ltd | Detecting circuit for electric field strength |
EP0059379B1 (fr) * | 1981-02-27 | 1988-09-28 | Sanyo Electric Co., Ltd. | Circuit détecteur de bruit et récepteur de télévision comportant un tel circuit |
NL8104533A (nl) * | 1981-10-06 | 1983-05-02 | Philips Nv | Synchroniseerschakeling voor het afleiden en verwerken van een, in een inkomend videosignaal aanwezig synchroniseersignaal. |
US4680631A (en) * | 1984-09-19 | 1987-07-14 | Tokyo Electric Co., Ltd. | Television composite video signal processing circuit |
JPS622783A (ja) * | 1985-06-28 | 1987-01-08 | Toshiba Corp | Agc回路 |
US4670904A (en) * | 1986-01-15 | 1987-06-02 | Rca Corporation | System for processing a scrambled video signal |
JPS62255090A (ja) * | 1986-04-30 | 1987-11-06 | 株式会社椿本チエイン | 物品把持機構 |
DE3618873A1 (de) * | 1986-06-05 | 1987-12-10 | Philips Patentverwaltung | Schaltunganordnung zum regeln der amplitude eines fernsehsignals |
US4937670A (en) * | 1989-01-31 | 1990-06-26 | Rca Licensing Corporation | Peak detector with feedback |
WO2003067877A1 (fr) * | 2002-02-09 | 2003-08-14 | Philips Intellectual Property & Standards Gmbh | Detecteur de commande automatique de gain (agc) et procede de detection d'agc |
US7787057B2 (en) * | 2006-08-22 | 2010-08-31 | Rgb Systems, Inc. | Method and apparatus for DC restoration using feedback |
Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3624290A (en) * | 1969-12-30 | 1971-11-30 | Zenith Radio Corp | Television receiver agc system keyed in response to time coincidence of sync and flyback pulses |
US3624288A (en) * | 1969-11-05 | 1971-11-30 | Zenith Radio Corp | Video signal noise elimination circuit |
US3898380A (en) * | 1973-10-17 | 1975-08-05 | Motorola Inc | AGC Detector circuit having noise and overload correction capability |
US3909522A (en) * | 1973-06-04 | 1975-09-30 | Zenith Radio Corp | Coincidence gated AGC for a television receiver |
Family Cites Families (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3740471A (en) * | 1970-09-10 | 1973-06-19 | Motorola Inc | Automatic gain control circuit |
JPS4893216A (fr) * | 1972-03-10 | 1973-12-03 |
-
1978
- 1978-08-18 US US05/934,822 patent/US4212032A/en not_active Expired - Lifetime
-
1979
- 1979-08-07 CA CA333,258A patent/CA1130914A/fr not_active Expired
- 1979-08-13 JP JP54103498A patent/JPS5840389B2/ja not_active Expired
- 1979-08-14 GB GB7928271A patent/GB2028613B/en not_active Expired
- 1979-08-17 DE DE2933472A patent/DE2933472C2/de not_active Expired
- 1979-08-17 FR FR7920894A patent/FR2433869A1/fr active Granted
Patent Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3624288A (en) * | 1969-11-05 | 1971-11-30 | Zenith Radio Corp | Video signal noise elimination circuit |
US3624290A (en) * | 1969-12-30 | 1971-11-30 | Zenith Radio Corp | Television receiver agc system keyed in response to time coincidence of sync and flyback pulses |
US3909522A (en) * | 1973-06-04 | 1975-09-30 | Zenith Radio Corp | Coincidence gated AGC for a television receiver |
US3898380A (en) * | 1973-10-17 | 1975-08-05 | Motorola Inc | AGC Detector circuit having noise and overload correction capability |
Also Published As
Publication number | Publication date |
---|---|
DE2933472C2 (de) | 1982-03-11 |
CA1130914A (fr) | 1982-08-31 |
GB2028613A (en) | 1980-03-05 |
GB2028613B (en) | 1983-02-02 |
FR2433869B1 (fr) | 1984-12-14 |
JPS5528695A (en) | 1980-02-29 |
DE2933472A1 (de) | 1980-02-28 |
JPS5840389B2 (ja) | 1983-09-05 |
US4212032A (en) | 1980-07-08 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
TP | Transmission of property | ||
ST | Notification of lapse |