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GB920053A - Improvements in television video frequency amplifiers - Google Patents

Improvements in television video frequency amplifiers

Info

Publication number
GB920053A
GB920053A GB4192161A GB4192161A GB920053A GB 920053 A GB920053 A GB 920053A GB 4192161 A GB4192161 A GB 4192161A GB 4192161 A GB4192161 A GB 4192161A GB 920053 A GB920053 A GB 920053A
Authority
GB
United Kingdom
Prior art keywords
transistor
diode
during
nov
video frequency
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
GB4192161A
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.)
Compagnie Francaise Thomson Houston SA
Original Assignee
Compagnie Francaise Thomson Houston SA
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 Compagnie Francaise Thomson Houston SA filed Critical Compagnie Francaise Thomson Houston SA
Publication of GB920053A publication Critical patent/GB920053A/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
    • H04N5/16—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

Landscapes

  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Amplifiers (AREA)
  • Synchronizing For Television (AREA)

Abstract

920,053. Television. COMPAGNIE FRANCAISE THOMSON-HOUSTON. Nov. 23, 1961 [Nov. 23, 1960], No. 41921/61. Class 40 (3). The last stage 10 of a transistorized videofrequency amplifier has a D.C. restoration device connected to its input, said device comprising a transistor 7 which also provides negative feedback to the stage, the feedback circuit including a diode 13 which renders the feedback circuit operative only during the duration of the synchronization pulses S. The transistor 5 is PNP and the transistor 7 NPN. During each image signal I the diode 13 is cut-off. During the synchronization pulses S the diode 13 conducts and the D.C. level detected by the capacitor 16 and resistor 14 and amplified by the transistor 7 is re-inserted in the base of amplifier 5. The synchronization pulse S also appears at the collector of the transistor 7.
GB4192161A 1960-11-23 1961-11-23 Improvements in television video frequency amplifiers Expired GB920053A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR844800A FR1280726A (en) 1960-11-23 1960-11-23 Improvements to video-frequency amplifiers

Publications (1)

Publication Number Publication Date
GB920053A true GB920053A (en) 1963-03-06

Family

ID=8743307

Family Applications (1)

Application Number Title Priority Date Filing Date
GB4192161A Expired GB920053A (en) 1960-11-23 1961-11-23 Improvements in television video frequency amplifiers

Country Status (2)

Country Link
FR (1) FR1280726A (en)
GB (1) GB920053A (en)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3324405A (en) * 1963-10-21 1967-06-06 Ferguson Radio Corp D.c. restoration in amplifiers
US3424993A (en) * 1966-02-09 1969-01-28 Motorola Inc Transistor protection circuit
DE1290579B (en) * 1965-08-31 1969-03-13 Standard Elektrik Lorenz Ag Circuit for the recovery of the suppressed DC voltage component of color or color difference signals
US3750038A (en) * 1971-11-12 1973-07-31 Jerrold Electronics Corp Amplifier circuit for coincidentally providing signal clamping operation
US4017681A (en) * 1974-09-09 1977-04-12 U.S. Philips Corporation Television receiver including a beam current limiting circuit

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3324405A (en) * 1963-10-21 1967-06-06 Ferguson Radio Corp D.c. restoration in amplifiers
DE1290579B (en) * 1965-08-31 1969-03-13 Standard Elektrik Lorenz Ag Circuit for the recovery of the suppressed DC voltage component of color or color difference signals
US3424993A (en) * 1966-02-09 1969-01-28 Motorola Inc Transistor protection circuit
US3750038A (en) * 1971-11-12 1973-07-31 Jerrold Electronics Corp Amplifier circuit for coincidentally providing signal clamping operation
US4017681A (en) * 1974-09-09 1977-04-12 U.S. Philips Corporation Television receiver including a beam current limiting circuit

Also Published As

Publication number Publication date
FR1280726A (en) 1962-01-08

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