GB1525532A - Precorrected television power transmitter arrangement - Google Patents
Precorrected television power transmitter arrangementInfo
- Publication number
- GB1525532A GB1525532A GB1828/76A GB182876A GB1525532A GB 1525532 A GB1525532 A GB 1525532A GB 1828/76 A GB1828/76 A GB 1828/76A GB 182876 A GB182876 A GB 182876A GB 1525532 A GB1525532 A GB 1525532A
- Authority
- GB
- United Kingdom
- Prior art keywords
- signal
- transistor
- mean
- gain
- component
- 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
- 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
Landscapes
- Engineering & Computer Science (AREA)
- Multimedia (AREA)
- Signal Processing (AREA)
- Physics & Mathematics (AREA)
- Nonlinear Science (AREA)
- Power Engineering (AREA)
- Optical Communication System (AREA)
- Picture Signal Circuits (AREA)
- Radar Systems Or Details Thereof (AREA)
- Agricultural Machines (AREA)
- Stereo-Broadcasting Methods (AREA)
- Amplifiers (AREA)
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 (1)
Publication Number | Publication Date |
---|---|
GB1525532A true GB1525532A (en) | 1978-09-20 |
Family
ID=9149985
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB1828/76A Expired GB1525532A (en) | 1975-01-17 | 1976-01-16 | Precorrected television power transmitter arrangement |
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) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4799106A (en) * | 1985-08-22 | 1989-01-17 | Rank Pullin Controls Limited | Controlling image signals in an imaging apparatus |
GB2211045A (en) * | 1987-10-10 | 1989-06-21 | Marconi Co Ltd | Linearity adjustable circuit |
Families Citing this family (1)
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 |
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 DE DE2601366A patent/DE2601366C2/en not_active Expired
- 1976-01-15 NL NLAANVRAGE7600370,A patent/NL182117C/en not_active IP Right Cessation
- 1976-01-16 SE SE7600442A patent/SE413274B/en not_active IP Right Cessation
- 1976-01-16 NO NO760155A patent/NO143442C/en unknown
- 1976-01-16 GB GB1828/76A patent/GB1525532A/en not_active Expired
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4799106A (en) * | 1985-08-22 | 1989-01-17 | Rank Pullin Controls Limited | Controlling image signals in an imaging apparatus |
GB2211045A (en) * | 1987-10-10 | 1989-06-21 | Marconi Co Ltd | Linearity adjustable circuit |
GB2211045B (en) * | 1987-10-10 | 1991-08-21 | Marconi Co Ltd | Linearity adjusting circuit |
US5119506A (en) * | 1987-10-10 | 1992-06-02 | The Marconi Company Limited | Circuit for automatically adjusting the rate of change of amplitude of an output signal over selected input signal amplitude bands |
Also Published As
Publication number | Publication date |
---|---|
FR2298228B1 (en) | 1977-11-18 |
NL182117C (en) | 1988-01-04 |
SE7600442L (en) | 1976-07-19 |
NO143442C (en) | 1981-02-11 |
NO760155L (en) | 1976-07-20 |
NO143442B (en) | 1980-11-03 |
FR2298228A1 (en) | 1976-08-13 |
DE2601366C2 (en) | 1982-09-23 |
DE2601366A1 (en) | 1976-07-22 |
SE413274B (en) | 1980-05-12 |
NL7600370A (en) | 1976-07-20 |
NL182117B (en) | 1987-08-03 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
GB1478804A (en) | Class d amplifiers | |
CA2074124A1 (en) | Transmitter with nonlinearity correction circuits | |
MY109525A (en) | Horizontal deflection waveform correction circuit | |
CA1186379A (en) | Arrangement for modulating the output signal of a converter, for example an electro-optical converter | |
JPS58201477A (en) | Dynamic coring circuit | |
EP0382373A3 (en) | Nonlinear noninverting transimpedance amplifier | |
GB1525904A (en) | Automatic noise limiter | |
GB1437913A (en) | ||
JPS55107308A (en) | Nonlinear compensation system of automatic following type | |
GB1525532A (en) | Precorrected television power transmitter arrangement | |
GB635236A (en) | Improvements in or relating to electric amplifier circuits | |
GB1286069A (en) | Analog to digital converter circuit | |
GB1437964A (en) | Asynchronous pulse receiver | |
US5311179A (en) | Method for amending the effect of offset voltage variations from the output voltage in a D/A converter | |
US4249208A (en) | Gamma correction circuit for a video signal and television camera suitable therefor | |
ES8205483A1 (en) | Amplifier arrangement | |
CA2072393A1 (en) | Variable delay device | |
ES372687A1 (en) | Synchronizing separator for separating synchronizing pulses from a composite video signal | |
KR910006481Y1 (en) | Video signal input circuit of tv | |
GB869581A (en) | Improvements in or relating to transistor amplifiers | |
GB1097214A (en) | Modulating system | |
JPS5660149A (en) | Transmitter for multiphase multilevel modulated signal accompanying amplitude modulation | |
GB1342950A (en) | Amplifiers | |
GB1205164A (en) | Improvements in gamma correction circuits | |
GB1420936A (en) | Gain control arrangements |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
PS | Patent sealed [section 19, patents act 1949] | ||
PE20 | Patent expired after termination of 20 years |
Effective date: 19960115 |