GB1525532A - Precorrected television power transmitter arrangement - Google Patents

Precorrected television power transmitter arrangement

Info

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
Application number
GB1828/76A
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Thales SA
Original Assignee
Thomson CSF SA
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Thomson CSF SA filed Critical Thomson CSF SA
Publication of GB1525532A publication Critical patent/GB1525532A/en
Expired legal-status Critical Current

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.
GB1828/76A 1975-01-17 1976-01-16 Precorrected television power transmitter arrangement Expired GB1525532A (en)

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)

* Cited by examiner, † Cited by third party
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)

* Cited by examiner, † Cited by third party
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)

* Cited by examiner, † Cited by third party
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

Cited By (4)

* Cited by examiner, † Cited by third party
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
SE413274B (en) 1980-05-12
NL182117B (en) 1987-08-03
FR2298228A1 (en) 1976-08-13
NO760155L (en) 1976-07-20
DE2601366C2 (en) 1982-09-23
DE2601366A1 (en) 1976-07-22
NO143442B (en) 1980-11-03
SE7600442L (en) 1976-07-18
NO143442C (en) 1981-02-11
NL182117C (en) 1988-01-04
FR2298228B1 (en) 1977-11-18
NL7600370A (en) 1976-07-20

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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