GB1074295A - Improvements in and relating to transmission circuit arrangements for inverting the polarity of a signal - Google Patents
Improvements in and relating to transmission circuit arrangements for inverting the polarity of a signalInfo
- Publication number
- GB1074295A GB1074295A GB685865A GB685865A GB1074295A GB 1074295 A GB1074295 A GB 1074295A GB 685865 A GB685865 A GB 685865A GB 685865 A GB685865 A GB 685865A GB 1074295 A GB1074295 A GB 1074295A
- Authority
- GB
- United Kingdom
- Prior art keywords
- stage
- inverting
- collector
- acts
- switch
- 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
- H03—ELECTRONIC CIRCUITRY
- H03F—AMPLIFIERS
- H03F3/00—Amplifiers with only discharge tubes or only semiconductor devices as amplifying elements
- H03F3/04—Amplifiers with only discharge tubes or only semiconductor devices as amplifying elements with semiconductor devices only
-
- 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
- H04N5/46—Receiver circuitry for the reception of television signals according to analogue transmission standards for receiving on more than one standard at will
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Multimedia (AREA)
- Signal Processing (AREA)
- Amplifiers (AREA)
- Picture Signal Circuits (AREA)
Abstract
1,074,295. Phase - reversible amplifiers. PHILIPS ELECTRONIC & ASSOCIATED INDUSTRIES Ltd. Feb. 17, 1965 [Feb. 19, 1964 (2)], No. 6858/65. Heading H3T. A transistor amplifier may be converted into a non-inverting unity gain stage by biasing the collector-base junction so that it acts as a shortcircuit. As applied to the post-detector stage of a dual-standard T.V. receiver (Fig. 2), the transistor 22 acts as a normal amplifier on one standard with switch 20 open, and as a non- inverting stage with switch 20 closed when the vision signal is of opposite polarity. The resistors 34 and 35 can be chosen so that the amplification is unity for both polarities. The collector-base junction also functions as a limiter for suppressing interference since, when forward biased, it will not pass negative signals large enough to overcome the bias. The preceding stage 21 acts as an emitter-follower for the video signals and a tuned commonemitter stage for the sound-carrier which is taken off at 24. Sound-rejection in the video channel is assisted by the rejector circuit 25. The switch 20 may apply a negative bias to the base instead of a positive bias to the collector. One or both transistors may be NPN. The arrangement is also applicable to logic circuits, computers and control systems.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FR964370A FR1394208A (en) | 1964-02-19 | 1964-02-19 | Polarity reversing assembly for image modulation transmission |
| FR964369A FR1401225A (en) | 1964-02-19 | 1964-02-19 | transmission stage for switching the polarity of a signal |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB1074295A true GB1074295A (en) | 1967-07-05 |
Family
ID=26206009
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB685865A Expired GB1074295A (en) | 1964-02-19 | 1965-02-17 | Improvements in and relating to transmission circuit arrangements for inverting the polarity of a signal |
Country Status (7)
| Country | Link |
|---|---|
| BE (1) | BE659855A (en) |
| CH (1) | CH432586A (en) |
| DE (1) | DE1255722B (en) |
| ES (1) | ES309508A1 (en) |
| FR (2) | FR1394208A (en) |
| GB (1) | GB1074295A (en) |
| NL (1) | NL6501883A (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1580245A (en) * | 1977-09-26 | 1980-11-26 | Philips Electronic Associated | Signal buffer circuit arrangement |
| GB2137460A (en) * | 1983-03-18 | 1984-10-03 | Philips Electronic Associated | Polarity reversing circuit for tv sync signals |
-
1964
- 1964-02-19 FR FR964370A patent/FR1394208A/en not_active Expired
- 1964-02-19 FR FR964369A patent/FR1401225A/en not_active Expired
-
1965
- 1965-02-16 NL NL6501883A patent/NL6501883A/xx unknown
- 1965-02-16 CH CH208065A patent/CH432586A/en unknown
- 1965-02-17 DE DE1965N0026233 patent/DE1255722B/en active Pending
- 1965-02-17 GB GB685865A patent/GB1074295A/en not_active Expired
- 1965-02-17 BE BE659855D patent/BE659855A/xx unknown
- 1965-02-18 ES ES0309508A patent/ES309508A1/en not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| ES309508A1 (en) | 1965-12-16 |
| CH432586A (en) | 1967-03-31 |
| DE1255722B (en) | 1967-12-07 |
| NL6501883A (en) | 1965-08-20 |
| FR1394208A (en) | 1965-04-02 |
| FR1401225A (en) | 1965-06-04 |
| BE659855A (en) | 1965-08-17 |
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