GB535413A - Television video-frequency signal-translating system - Google Patents

Television video-frequency signal-translating system

Info

Publication number
GB535413A
GB535413A GB22870/39A GB2287039A GB535413A GB 535413 A GB535413 A GB 535413A GB 22870/39 A GB22870/39 A GB 22870/39A GB 2287039 A GB2287039 A GB 2287039A GB 535413 A GB535413 A GB 535413A
Authority
GB
United Kingdom
Prior art keywords
valve
amplitude
valves
amplitude range
resistance
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
GB22870/39A
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 GB535413A publication Critical patent/GB535413A/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
    • H04N5/14—Picture signal circuitry for video frequency region
    • H04N5/20—Circuitry for controlling amplitude response
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03G—CONTROL OF AMPLIFICATION
    • H03G7/00—Volume compression or expansion in amplifiers
    • H03G7/02—Volume compression or expansion in amplifiers having discharge tubes
    • H03G7/04—Volume compression or expansion in amplifiers having discharge tubes incorporating negative feedback
    • 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
    • H04N5/20—Circuitry for controlling amplitude response
    • H04N5/202—Gamma control

Abstract

535,413. Television ; valve amplifying circuits. HAZELTINE CORPORATION. Aug. 8, 1939, No. 22870. Convention date, Aug. 31, 1938. [Classes 40 (iii) and 40 (v)] A television video-frequency amplifier with amplitude discrimination for increasing contrast &c. comprises two valves, one repeating the whole of the amplitude range and the other a selected part of the amplitude range, the outputs being combined to develop a composite signal of the required contrast &c. In Fig. 1, the control circuit of valve 21 is connected across the cathode resistance 22 of valve 20, resistance 22 and bias potential 23 being adjustable. Valve 20 repeats the whole amplitude range but potential 23 is adjusted so that only signals above a certain amplitude are repeated by valve 21. Adjustment of resistance 22 controls the negative feed back and also the amplitude of the signal applied to valve 21, these effects opposing each other. In Fig. 3, the signal is applied to the grids of both valves 20a, 21a, an additional opposed battery 27 in the circuit of valve 20a causing this valve to saturate for signals above a certain value. The adjusting-devices of batteries 27, 23a are ganged as shown at U. The composite characteristic of valves 20a, 21a may be such as to increase the amplification of the black or white parts of the picture, or of both black and white relative to the grey parts, while the overall amplitude range remains substantially constant for all adjustments.
GB22870/39A 1938-08-31 1939-08-08 Television video-frequency signal-translating system Expired GB535413A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US227629A US2247512A (en) 1938-08-31 1938-08-31 Television video-frequency signaltranslating system

Publications (1)

Publication Number Publication Date
GB535413A true GB535413A (en) 1941-04-09

Family

ID=22853842

Family Applications (1)

Application Number Title Priority Date Filing Date
GB22870/39A Expired GB535413A (en) 1938-08-31 1939-08-08 Television video-frequency signal-translating system

Country Status (4)

Country Link
US (1) US2247512A (en)
FR (1) FR859813A (en)
GB (1) GB535413A (en)
NL (1) NL65998C (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE956587C (en) * 1953-06-26 1957-01-24 Fernseh Gmbh Arrangement for gradation equalization in television broadcasting systems
DE1011784B (en) * 1954-12-08 1957-07-04 Eisenwerke Muelheim Meiderich Process for observing, monitoring and regulating the melting processes in metallurgical melting or sintering furnaces
DE1088534B (en) * 1956-10-20 1960-09-08 Grundig Max Gradation regulator for television receivers

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2594870A (en) * 1945-11-29 1952-04-29 Us Navy Indicator
US2552588A (en) * 1947-04-26 1951-05-15 Columbia Broadeasting System I Gamma control circuit
US2692299A (en) * 1948-12-11 1954-10-19 Westinghouse Electric Corp Image contrast intensifier
US2668188A (en) * 1949-12-19 1954-02-02 Rubert S Naslund Television gamma test method and apparatus

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE956587C (en) * 1953-06-26 1957-01-24 Fernseh Gmbh Arrangement for gradation equalization in television broadcasting systems
DE1011784B (en) * 1954-12-08 1957-07-04 Eisenwerke Muelheim Meiderich Process for observing, monitoring and regulating the melting processes in metallurgical melting or sintering furnaces
DE1088534B (en) * 1956-10-20 1960-09-08 Grundig Max Gradation regulator for television receivers

Also Published As

Publication number Publication date
FR859813A (en) 1940-12-30
NL65998C (en)
US2247512A (en) 1941-07-01

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