GB520082A - Improvements in or relating to television receivers - Google Patents

Improvements in or relating to television receivers

Info

Publication number
GB520082A
GB520082A GB2912738A GB2912738A GB520082A GB 520082 A GB520082 A GB 520082A GB 2912738 A GB2912738 A GB 2912738A GB 2912738 A GB2912738 A GB 2912738A GB 520082 A GB520082 A GB 520082A
Authority
GB
United Kingdom
Prior art keywords
receiver
auxiliary
circuit
gain
control
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
GB2912738A
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.)
Kolster Brandes Ltd
Original Assignee
Kolster Brandes Ltd
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
Priority to DENDAT880148D priority Critical patent/DE880148C/en
Application filed by Kolster Brandes Ltd filed Critical Kolster Brandes Ltd
Priority to GB2912738A priority patent/GB520082A/en
Publication of GB520082A publication Critical patent/GB520082A/en
Expired legal-status Critical Current

Links

Classifications

    • 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
    • H04N5/52—Automatic gain control
    • H04N5/53—Keyed automatic gain control

Abstract

520,082. Wireless receivers. KOLSTERBRANDES, Ltd., and BEATTY, W. A. Oct. 7, 1938, No. 29127. Drawings to Specification. [Class 40 (v)] Automatic gain-control of a television receiver is obtained through the medium of derived pulses developed solely during frame synchronisation and applied to an auxiliary circuit which is made operative during the frame pulse and part of the following black-out period, the output of the auxiliary receiver being applied through any known gain-control circuit to control the gain of the vision receiver. In order to make the derived pulses of sufficient duration for the auxiliary receiver to be operative for a certain portion of each frame period, a biasing voltage obtained from the pulses is arranged to oppose the cut-off bias normally rendering the auxiliary receiver inoperative, and is applied thereto through a circuit having an asymmetrical time-constant, e.g., a diode charged through a condenser and discharged through a resistance. Specification 501,349 is referred to.
GB2912738A 1938-10-07 1938-10-07 Improvements in or relating to television receivers Expired GB520082A (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
DENDAT880148D DE880148C (en) 1938-10-07 Circuit arrangement for automatic amplitude control in television receivers
GB2912738A GB520082A (en) 1938-10-07 1938-10-07 Improvements in or relating to television receivers

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB2912738A GB520082A (en) 1938-10-07 1938-10-07 Improvements in or relating to television receivers

Publications (1)

Publication Number Publication Date
GB520082A true GB520082A (en) 1940-04-15

Family

ID=10286584

Family Applications (1)

Application Number Title Priority Date Filing Date
GB2912738A Expired GB520082A (en) 1938-10-07 1938-10-07 Improvements in or relating to television receivers

Country Status (2)

Country Link
DE (1) DE880148C (en)
GB (1) GB520082A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE975051C (en) * 1946-01-25 1961-07-20 Hazeltine Corp Device for automatic gain control in television receivers for negatively modulated television characters

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE975051C (en) * 1946-01-25 1961-07-20 Hazeltine Corp Device for automatic gain control in television receivers for negatively modulated television characters

Also Published As

Publication number Publication date
DE880148C (en) 1953-05-07

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