GB1525532A – Precorrected television power transmitter arrangement
– Google Patents
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
1975-01-17
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.)
1975-01-17
Filing date
1976-01-16
Publication date
1978-09-20
1976-01-16
Application filed by Thomson CSF SA
filed
Critical
Thomson CSF SA
1978-09-20
Publication of GB1525532A
publication
Critical
patent/GB1525532A/en
Status
Expired
legal-status
Critical
Current
Links
Espacenet
Global Dossier
Discuss
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
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
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)
* 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
NO143442B
(en)
1980-11-03
SE7600442L
(en)
1976-07-18
NL182117C
(en)
1988-01-04
DE2601366A1
(en)
1976-07-22
NO760155L
(en)
1976-07-20
FR2298228B1
(en)
1977-11-18
NL182117B
(en)
1987-08-03
FR2298228A1
(en)
1976-08-13
NL7600370A
(en)
1976-07-20
DE2601366C2
(en)
1982-09-23
SE413274B
(en)
1980-05-12
NO143442C
(en)
1981-02-11
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Legal Events
Date
Code
Title
Description
1979-01-10
PS
Patent sealed [section 19, patents act 1949]
1996-02-14
PE20
Patent expired after termination of 20 years
Effective date:
19960115
