GB484202A - Improvements in or relating to television systems - Google Patents

Improvements in or relating to television systems

Info

Publication number
GB484202A
GB484202A GB2647436A GB2647436A GB484202A GB 484202 A GB484202 A GB 484202A GB 2647436 A GB2647436 A GB 2647436A GB 2647436 A GB2647436 A GB 2647436A GB 484202 A GB484202 A GB 484202A
Authority
GB
United Kingdom
Prior art keywords
valve
grid
resistance
synchronizing impulses
condenser
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
GB2647436A
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.)
Individual
Original Assignee
Individual
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 NL56592D priority Critical patent/NL56592C/xx
Application filed by Individual filed Critical Individual
Priority to GB2647436A priority patent/GB484202A/en
Priority to FR827382D priority patent/FR827382A/en
Publication of GB484202A publication Critical patent/GB484202A/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
    • 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

Landscapes

  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Circuits Of Receivers In General (AREA)

Abstract

484,202. Valve circuits for wireless reception. KALLMANN, H. E., and SPENCER, R. E. Sept. 30, 1936, No. 26474. [Class 40 (v)] A.V.C. voltages are derived from a television signal by displacing the synchronizing impulses so that the minimum amplitude of the resulting signal corresponds to minimum vision modulation and deriving a voltage corresponding to said minimum amplitude. The complete signal from the cathode resistance 21 of a V.F. amplifier 11 is applied through condenser 23 to the grid 26 of a valve 27 and also through resistance 31 to the grid 36 of valve 37. The valve 27 produces phase reversed synchronizing impulses at its anode which are applied through condenser 29 to the grid of valve 37 where they more than balance out the synchronizing impulses fed through resistance 31. Gain controlling voltage is taken from the cathode of valve 37 through filter 51, 53, 55, a diode 48, 49 being provided to prevent the production of positive control voltage. D.C. insertion may be provided in valve 27 by the method described in Specification 422,906.
GB2647436A 1936-09-30 1936-09-30 Improvements in or relating to television systems Expired GB484202A (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
NL56592D NL56592C (en) 1936-09-30
GB2647436A GB484202A (en) 1936-09-30 1936-09-30 Improvements in or relating to television systems
FR827382D FR827382A (en) 1936-09-30 1937-09-30 Improvements to television systems

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB2647436A GB484202A (en) 1936-09-30 1936-09-30 Improvements in or relating to television systems

Publications (1)

Publication Number Publication Date
GB484202A true GB484202A (en) 1938-05-02

Family

ID=10244209

Family Applications (1)

Application Number Title Priority Date Filing Date
GB2647436A Expired GB484202A (en) 1936-09-30 1936-09-30 Improvements in or relating to television systems

Country Status (3)

Country Link
FR (1) FR827382A (en)
GB (1) GB484202A (en)
NL (1) NL56592C (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1010561B (en) * 1953-10-27 1957-06-19 Emi Ltd Circuit arrangement for deriving a control voltage in television receivers

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1010561B (en) * 1953-10-27 1957-06-19 Emi Ltd Circuit arrangement for deriving a control voltage in television receivers

Also Published As

Publication number Publication date
NL56592C (en)
FR827382A (en) 1938-04-25

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