GB1487586A - Video amplifier circuit for use with synchronous detector - Google Patents
Video amplifier circuit for use with synchronous detectorInfo
- Publication number
- GB1487586A GB1487586A GB52205/74A GB5220574A GB1487586A GB 1487586 A GB1487586 A GB 1487586A GB 52205/74 A GB52205/74 A GB 52205/74A GB 5220574 A GB5220574 A GB 5220574A GB 1487586 A GB1487586 A GB 1487586A
- Authority
- GB
- United Kingdom
- Prior art keywords
- signals
- transistor
- pulses
- dec
- going
- 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
- H04N5/00—Details of television systems
- H04N5/44—Receiver circuitry for the reception of television signals according to analogue transmission standards
- H04N5/455—Demodulation-circuits
Landscapes
- Engineering & Computer Science (AREA)
- Multimedia (AREA)
- Signal Processing (AREA)
- Picture Signal Circuits (AREA)
- Amplifiers (AREA)
- Processing Of Color Television Signals (AREA)
Abstract
1487586 Interference suppression in TV receivers; transistor absolute value amplifiers RCA CORPORATION 3 Dec 1974 [28 Dec 1973] 52205/74 Headings H4L and H3T In an amplitude modulation detector circuit (e.g. a synchronous detector in a T.V. receiver) which converts accompanying noise pulses 50 into two pulses 56, 57 of opposite polarity, the combined signal and converted noise is passed through a single channel in which one polarity is inverted to be the same as the other. This can ensure that both noise pulses are black-going. The conversion of bipolar signals to monopolar is effected by a transistor circuit (Fig. 2). Negative going signals at the input 212 are amplified normally but positive going signals cause the base-emitter path of transistor 201 to be forward biased so that the signals are passed to the base of 204 without inversion. The same effect is produced in Fig. 4, not shown, by a negative feedback differential amplifier having a reference voltage applied to the non-inverting input (3).
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US429673A US3862361A (en) | 1973-12-28 | 1973-12-28 | Video amplifier circuit for use with synchronous detectors |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB1487586A true GB1487586A (en) | 1977-10-05 |
Family
ID=23704255
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB52205/74A Expired GB1487586A (en) | 1973-12-28 | 1974-12-03 | Video amplifier circuit for use with synchronous detector |
Country Status (15)
| Country | Link |
|---|---|
| US (1) | US3862361A (en) |
| JP (1) | JPS5436009B2 (en) |
| AT (1) | AT368339B (en) |
| BE (1) | BE823781A (en) |
| BR (1) | BR7410731D0 (en) |
| CA (1) | CA1035429A (en) |
| DE (1) | DE2460264B2 (en) |
| DK (1) | DK147029C (en) |
| ES (1) | ES432720A1 (en) |
| FI (1) | FI61982C (en) |
| FR (1) | FR2256602B1 (en) |
| GB (1) | GB1487586A (en) |
| IT (1) | IT1025805B (en) |
| NL (1) | NL7416932A (en) |
| SE (1) | SE399797B (en) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6041493B2 (en) * | 1977-03-16 | 1985-09-17 | ソニー株式会社 | Receiving machine |
| US4253118A (en) * | 1979-07-02 | 1981-02-24 | Zenith Radio Corporation | Synchronous detection system |
| US4329712A (en) * | 1980-06-24 | 1982-05-11 | Rca Corporation | Adaptive distortion elimination circuitry for a video disc player |
| US4562475A (en) * | 1984-03-15 | 1985-12-31 | Rca Corporation | DC Restoration of synchronously detected CCD imager output signals |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3812921A (en) * | 1972-07-24 | 1974-05-28 | Zenith Radio Corp | Video signal processing system and method with above-white-level noise inversion |
| US3812289A (en) * | 1972-11-06 | 1974-05-21 | Rca Corp | Television receiver using synchronous video detection |
-
1973
- 1973-12-28 US US429673A patent/US3862361A/en not_active Expired - Lifetime
-
1974
- 1974-11-07 CA CA213,191A patent/CA1035429A/en not_active Expired
- 1974-11-18 IT IT29568/74A patent/IT1025805B/en active
- 1974-12-03 GB GB52205/74A patent/GB1487586A/en not_active Expired
- 1974-12-09 ES ES432720A patent/ES432720A1/en not_active Expired
- 1974-12-18 SE SE7415895A patent/SE399797B/en unknown
- 1974-12-18 FR FR7441794A patent/FR2256602B1/fr not_active Expired
- 1974-12-19 DE DE19742460264 patent/DE2460264B2/en not_active Withdrawn
- 1974-12-20 AT AT1025274A patent/AT368339B/en not_active IP Right Cessation
- 1974-12-20 FI FI3712/74A patent/FI61982C/en active
- 1974-12-20 DK DK669674A patent/DK147029C/en not_active IP Right Cessation
- 1974-12-23 BE BE151876A patent/BE823781A/en unknown
- 1974-12-23 BR BR10731/74A patent/BR7410731D0/en unknown
- 1974-12-23 JP JP754205A patent/JPS5436009B2/ja not_active Expired
- 1974-12-27 NL NL7416932A patent/NL7416932A/en not_active Application Discontinuation
Also Published As
| Publication number | Publication date |
|---|---|
| US3862361A (en) | 1975-01-21 |
| ATA1025274A (en) | 1982-01-15 |
| SE399797B (en) | 1978-02-27 |
| DK147029B (en) | 1984-03-19 |
| AU7669674A (en) | 1976-06-24 |
| BE823781A (en) | 1975-04-16 |
| FI61982C (en) | 1982-10-11 |
| DE2460264A1 (en) | 1975-07-10 |
| DE2460264B2 (en) | 1976-09-09 |
| ES432720A1 (en) | 1977-02-16 |
| SE7415895L (en) | 1975-06-30 |
| DK147029C (en) | 1984-08-27 |
| BR7410731D0 (en) | 1975-09-02 |
| AT368339B (en) | 1982-10-11 |
| NL7416932A (en) | 1975-07-01 |
| FR2256602B1 (en) | 1978-07-13 |
| FI61982B (en) | 1982-06-30 |
| IT1025805B (en) | 1978-08-30 |
| FR2256602A1 (en) | 1975-07-25 |
| DK669674A (en) | 1975-08-18 |
| JPS50118618A (en) | 1975-09-17 |
| FI371274A (en) | 1975-06-29 |
| CA1035429A (en) | 1978-07-25 |
| JPS5436009B2 (en) | 1979-11-07 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PS | Patent sealed [section 19, patents act 1949] | ||
| PCNP | Patent ceased through non-payment of renewal fee |