GB530426A - Automatic control system for television receivers - Google Patents

Automatic control system for television receivers

Info

Publication number
GB530426A
GB530426A GB18349/39A GB1834939A GB530426A GB 530426 A GB530426 A GB 530426A GB 18349/39 A GB18349/39 A GB 18349/39A GB 1834939 A GB1834939 A GB 1834939A GB 530426 A GB530426 A GB 530426A
Authority
GB
United Kingdom
Prior art keywords
valve
pulses
diode
resistance
signal
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
GB18349/39A
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.)
BAE Systems Aerospace Inc
Original Assignee
Hazeltine Corp
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 Hazeltine Corp filed Critical Hazeltine Corp
Publication of GB530426A publication Critical patent/GB530426A/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
    • 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

Landscapes

  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Picture Signal Circuits (AREA)
  • Control Of Amplification And Gain Control (AREA)

Abstract

530,426. Automatic gain control. HAZELTINE CORPORATION. June 23, 1939, No. 18349. Convention date, July 27, 1938. [Classes 40 (iii) and 40 (v)] The vision signal is detected by diode 24, and the lower envelope thereof is developed across the resistance 27. This envelope, together with pulses which are received from a valve 42 and which block out the synchronizing pulses in the signal, is applied to the triode section of valve 23. The output therefrom is developed across a resistance 30 and is applied to the reproducer 17, through an amplifier 31 and through circuit 16 which stabilizes the signal at its blanking level. The output from valve 23 is also applied in part to a diode 50 which develops across resistance 52 a potential dependent on the peak value which, as the lower envelope is being used, is the black level. This potential is used for gain control and is applied to the carrier frequency stages. The valve 42 is fed from diode 38 and produces pulses at the moments of the synchronizing signals, and applies these to the valve 23, to the separator 20 and thence to the line and frame generators 21, 22, and also to the reproducer 17 so as to prevent reproduction of synchronizing pulses in the vision signal from amplifier 31.
GB18349/39A 1938-07-27 1939-06-23 Automatic control system for television receivers Expired GB530426A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US221497A US2249533A (en) 1938-07-27 1938-07-27 Television receiver including black-level control

Publications (1)

Publication Number Publication Date
GB530426A true GB530426A (en) 1940-12-11

Family

ID=22828067

Family Applications (1)

Application Number Title Priority Date Filing Date
GB18349/39A Expired GB530426A (en) 1938-07-27 1939-06-23 Automatic control system for television receivers

Country Status (2)

Country Link
US (1) US2249533A (en)
GB (1) GB530426A (en)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB777803A (en) * 1953-01-15 1957-06-26 Pye Ltd Improvements in or relating to television receivers
NL191748A (en) * 1953-10-27

Also Published As

Publication number Publication date
US2249533A (en) 1941-07-15

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