GB515363A - Improvements in or relating to thermionic valve circuits - Google Patents

Improvements in or relating to thermionic valve circuits

Info

Publication number
GB515363A
GB515363A GB16083/38A GB1608338A GB515363A GB 515363 A GB515363 A GB 515363A GB 16083/38 A GB16083/38 A GB 16083/38A GB 1608338 A GB1608338 A GB 1608338A GB 515363 A GB515363 A GB 515363A
Authority
GB
United Kingdom
Prior art keywords
pulses
controlling
valve
synchronizing
switch
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
GB16083/38A
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
Application filed by Individual filed Critical Individual
Priority to GB16083/38A priority Critical patent/GB515363A/en
Priority to US276234A priority patent/US2307218A/en
Priority to DEE2354D priority patent/DE976144C/en
Publication of GB515363A publication Critical patent/GB515363A/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
    • H04N5/14—Picture signal circuitry for video frequency region
    • H04N5/16—Circuitry for reinsertion of dc and slowly varying components of signal; Circuitry for preservation of black or white level
    • H04N5/165—Circuitry for reinsertion of dc and slowly varying components of signal; Circuitry for preservation of black or white level to maintain the black level constant
    • 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

Abstract

515,363. Television. HARDWICK, J. May 30, 1938, No. 16083. [Classes 40 (iii) and 40 (v)] A thermionic valve 16 with at least three electrodes functions as a switch on the application of switching pulses which are derived from controlling pulses by passing the latter through a coupling 17, 18, 19 which renders the switch conductive only after the termination of the controlling pulses. Each synchronizing or other controlling pulse is differentiated by the .transformer to afford two pulses of opposite sign from the leading and trailing edges respectively of the synchronizing pulse, and the valve is rendered conductive by the pulse generated by the trailing edge. The synchronizing pulses are followed by datum portions (e.g. black) and the valve connects a condenser 24 and resistance 25 to a lead 14 to stabilize the potential of the television signals and provide a gain-controlling potential. According to a modification, two valves are connected back-to-back and have the switching pulses applied to them simultaneously to serve as a two-way conducting switch, and a potentiometer is connected between the anode of one valve and the cathode of the other for balancing, Fig. 2 (not shown). Specifications 456,450 and 458,585 are referred to.
GB16083/38A 1938-05-30 1938-05-30 Improvements in or relating to thermionic valve circuits Expired GB515363A (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
GB16083/38A GB515363A (en) 1938-05-30 1938-05-30 Improvements in or relating to thermionic valve circuits
US276234A US2307218A (en) 1938-05-30 1939-05-27 Thermionic valve circuit
DEE2354D DE976144C (en) 1938-05-30 1939-05-28 Electrical switch with an electron tube controlled by switching pulses

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB16083/38A GB515363A (en) 1938-05-30 1938-05-30 Improvements in or relating to thermionic valve circuits

Publications (1)

Publication Number Publication Date
GB515363A true GB515363A (en) 1939-12-04

Family

ID=10070863

Family Applications (1)

Application Number Title Priority Date Filing Date
GB16083/38A Expired GB515363A (en) 1938-05-30 1938-05-30 Improvements in or relating to thermionic valve circuits

Country Status (3)

Country Link
US (1) US2307218A (en)
DE (1) DE976144C (en)
GB (1) GB515363A (en)

Families Citing this family (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2591088A (en) * 1945-11-30 1952-04-01 Us Navy Video blanking circuit
US2548436A (en) * 1946-01-25 1951-04-10 Hazeltine Corp Television receiver background control circuit
US2586193A (en) * 1948-08-19 1952-02-19 Rca Corp Keyed automatic gain control system
BE492808A (en) * 1948-12-18
BE498896A (en) * 1949-10-29
US2691697A (en) * 1949-11-19 1954-10-12 Zenith Radio Corp Overload compensating network for keyed automatic gain control network
GB697966A (en) * 1950-07-11 1953-10-07 Pye Ltd Improvements in and relating to television apparatus
US2784249A (en) * 1950-07-21 1957-03-05 Hazeltine Research Inc Keyed automatic gain control

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
BE411185A (en) * 1934-09-18
DE878512C (en) * 1935-03-20 1953-04-16 Emi Ltd Method for fading control or for reintroducing the direct current component into electrical signals, especially in television

Also Published As

Publication number Publication date
US2307218A (en) 1943-01-05
DE976144C (en) 1963-03-28

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