SE7600442L - OILINITY PRE-CORRECTION DEVICE - Google Patents
OILINITY PRE-CORRECTION DEVICEInfo
- Publication number
- SE7600442L SE7600442L SE7600442A SE7600442A SE7600442L SE 7600442 L SE7600442 L SE 7600442L SE 7600442 A SE7600442 A SE 7600442A SE 7600442 A SE7600442 A SE 7600442A SE 7600442 L SE7600442 L SE 7600442L
- Authority
- SE
- Sweden
- Prior art keywords
- signal
- transistor
- mean
- gain
- component
- Prior art date
Links
Classifications
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03F—AMPLIFIERS
- H03F1/00—Details of amplifiers with only discharge tubes, only semiconductor devices or only unspecified devices as amplifying elements
- H03F1/32—Modifications of amplifiers to reduce non-linear distortion
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03G—CONTROL OF AMPLIFICATION
- H03G1/00—Details of arrangements for controlling amplification
- H03G1/0005—Circuits characterised by the type of controlling devices operated by a controlling current or voltage signal
- H03G1/0088—Circuits characterised by the type of controlling devices operated by a controlling current or voltage signal using discontinuously variable devices, e.g. switch-operated
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N5/00—Details of television systems
- H04N5/38—Transmitter circuitry for the transmission of television signals according to analogue transmission standards
Abstract
1525532 Television THOMSON-CSF 16 Jan 1976 [17 Jan 1975] 01828/76 Heading H4F A television power transmitter arrangement comprises a non-linearity precorrection device designed to precorrect distortions introduced by non-linear power stages of a transmitter whose gain slightly varies as the value of the variable mean component of a composite video signal' modulating the high frequency signal amplified by said power stages. The precorrection device comprises a variable gain amplifier consisting of a transistor 17 having its laser coupled for receiving a signal whose mean component is variable and an emitter for coupling at S to said non-linear amplifier, means for detecting the mean component of said signal and consisting of a low-pass network comprising resistor 9 and capacitor 11 and of a transistor 21, and means for controlling the gain of said variable gain amplifier and including diodes 23, 26 and resistors 22, 25, said diodes being blocked or unblocked according to the mean signal component applied to the base of transistor 17, said gain increasing as said mean component decreases. The device includes an inverter circuit 4 receiving the video frequency signal to be precorrected, the inverted signal appearing at the output of transistor 5 being clamped by clamping pulses at the line frequency applied to an input E 2 . More than two resistor and diode branches 22, 23 and 25, 26 may be provided to achieve a more continuous variation in the gain of transistor 17 as a function of the mean signal component applied thereto. The non-linear amplifier which is coupled to the device at S is followed by a conventional non-linearity correction device.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR7501508A FR2298228A1 (en) | 1975-01-17 | 1975-01-17 | NON-LINEARITY PRECORRECTION DEVICE AND TELEVISION TRANSMITTER INCLUDING SUCH A DEVICE |
Publications (2)
Publication Number | Publication Date |
---|---|
SE7600442L true SE7600442L (en) | 1976-07-18 |
SE413274B SE413274B (en) | 1980-05-12 |
Family
ID=9149985
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
SE7600442A SE413274B (en) | 1975-01-17 | 1976-01-16 | DEVICE FOR PRINCIPLE OF OIL LINE |
Country Status (6)
Country | Link |
---|---|
DE (1) | DE2601366C2 (en) |
FR (1) | FR2298228A1 (en) |
GB (1) | GB1525532A (en) |
NL (1) | NL182117C (en) |
NO (1) | NO143442C (en) |
SE (1) | SE413274B (en) |
Families Citing this family (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CH642497A5 (en) * | 1978-09-27 | 1984-04-13 | Patelhold Patentverwertung | Method and circuit arrangement for linearisation of the transmission curve of an AM modulator for high-power broadcasting stations |
GB8521019D0 (en) * | 1985-08-22 | 1986-10-01 | Rank Pullin Controls Ltd | Imaging apparatus |
GB2211045B (en) * | 1987-10-10 | 1991-08-21 | Marconi Co Ltd | Linearity adjusting circuit |
Family Cites Families (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE2060458C3 (en) * | 1970-12-09 | 1975-08-14 | Robert Bosch Gmbh, 7000 Stuttgart | Circuit arrangement for the compensation of linearity errors in amplifiers |
DE2140851B2 (en) * | 1971-08-14 | 1976-03-11 | Rohde & Schwarz, 8000 München | Compensating circuit to minimise distortion effects in HF signals - has signal transmitted through parallel circuits one with phase shift |
DD96127A1 (en) * | 1972-04-18 | 1973-03-12 |
-
1975
- 1975-01-17 FR FR7501508A patent/FR2298228A1/en active Granted
-
1976
- 1976-01-15 NL NLAANVRAGE7600370,A patent/NL182117C/en not_active IP Right Cessation
- 1976-01-15 DE DE2601366A patent/DE2601366C2/en not_active Expired
- 1976-01-16 GB GB1828/76A patent/GB1525532A/en not_active Expired
- 1976-01-16 SE SE7600442A patent/SE413274B/en not_active IP Right Cessation
- 1976-01-16 NO NO760155A patent/NO143442C/en unknown
Also Published As
Publication number | Publication date |
---|---|
NO143442C (en) | 1981-02-11 |
SE413274B (en) | 1980-05-12 |
NL182117B (en) | 1987-08-03 |
NO760155L (en) | 1976-07-20 |
NL182117C (en) | 1988-01-04 |
DE2601366C2 (en) | 1982-09-23 |
NL7600370A (en) | 1976-07-20 |
FR2298228B1 (en) | 1977-11-18 |
GB1525532A (en) | 1978-09-20 |
FR2298228A1 (en) | 1976-08-13 |
NO143442B (en) | 1980-11-03 |
DE2601366A1 (en) | 1976-07-22 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
NUG | Patent has lapsed |
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