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FR2445068A1 - TV receiver circuit with controllable video signal amplifier - uses output signal with converted amplitude supplied to peak value rectifier, transmitting control magnitude - Google Patents

TV receiver circuit with controllable video signal amplifier - uses output signal with converted amplitude supplied to peak value rectifier, transmitting control magnitude

Info

Publication number
FR2445068A1
FR2445068A1 FR7931469A FR7931469A FR2445068A1 FR 2445068 A1 FR2445068 A1 FR 2445068A1 FR 7931469 A FR7931469 A FR 7931469A FR 7931469 A FR7931469 A FR 7931469A FR 2445068 A1 FR2445068 A1 FR 2445068A1
Authority
FR
France
Prior art keywords
converted
peak value
output signal
control magnitude
video 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.)
Withdrawn
Application number
FR7931469A
Other languages
French (fr)
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.)
Koninklijke Philips NV
Original Assignee
Philips Gloeilampenfabrieken NV
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 Philips Gloeilampenfabrieken NV filed Critical Philips Gloeilampenfabrieken NV
Publication of FR2445068A1 publication Critical patent/FR2445068A1/en
Withdrawn legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03G—CONTROL OF AMPLIFICATION
    • H03G3/00—Gain control in amplifiers or frequency changers
    • H03G3/20—Automatic control
    • H03G3/30—Automatic control in amplifiers having semiconductor devices
    • H03G3/3036—Automatic control in amplifiers having semiconductor devices in high-frequency amplifiers or in frequency-changers
    • 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)
  • Control Of Amplification And Gain Control (AREA)
  • Picture Signal Circuits (AREA)

Abstract

A control magnitude is obtained for the intermediate frequency video signal amplifier from the peak value of the output signal. The latter is converted in its amplitude response by a converter (5), corresponding at least to one higher potential. Then it is supplied to a peak value rectifier (9), transmitting the control magnitude. Pref. the amplitude response is converted according to a rising exponential function. The converted signal corresponds to a parabola with an exponent exceeding 1.5. Alternately the amplitude response may be converted in correspondence with a characteristic with suppressed starting values. Amplitude range of the control signal is pref. suppressed, or at least reduced below 20 to 30% of the value appearing during normal control. The output signal may be squared by a multiplier stage (5) both whose inputs (3a, 3b) receive the output signal. The converter-multiplier contains current amplifier stages, and the converted and possibly amplified current then supply the control magnitude via a current peak value circuit, which feeds a capacitor.
FR7931469A 1978-12-23 1979-12-21 TV receiver circuit with controllable video signal amplifier - uses output signal with converted amplitude supplied to peak value rectifier, transmitting control magnitude Withdrawn FR2445068A1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE19782855880 DE2855880C2 (en) 1978-12-23 1978-12-23 Circuit arrangement with a controllable amplifier

Publications (1)

Publication Number Publication Date
FR2445068A1 true FR2445068A1 (en) 1980-07-18

Family

ID=6058200

Family Applications (1)

Application Number Title Priority Date Filing Date
FR7931469A Withdrawn FR2445068A1 (en) 1978-12-23 1979-12-21 TV receiver circuit with controllable video signal amplifier - uses output signal with converted amplitude supplied to peak value rectifier, transmitting control magnitude

Country Status (3)

Country Link
JP (1) JPS5592011A (en)
DE (1) DE2855880C2 (en)
FR (1) FR2445068A1 (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0152985A1 (en) * 1984-02-16 1985-08-28 Koninklijke Philips Electronics N.V. Gain-controlled amplifier arrangement
FR2585205A1 (en) * 1985-07-19 1987-01-23 Philips Nv Circuit for TV receiver with controllable IF video signal amplifier

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH03214885A (en) * 1990-01-19 1991-09-20 Toshiba Corp Circuit for emphasizing chrominance signal outline

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2347192A1 (en) * 1973-09-19 1975-03-27 Siemens Ag Control voltage generation cct. - designed for picture IF amplifier and for interference pulses suppression from video signal

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0152985A1 (en) * 1984-02-16 1985-08-28 Koninklijke Philips Electronics N.V. Gain-controlled amplifier arrangement
FR2585205A1 (en) * 1985-07-19 1987-01-23 Philips Nv Circuit for TV receiver with controllable IF video signal amplifier

Also Published As

Publication number Publication date
DE2855880C2 (en) 1982-09-16
JPS5592011A (en) 1980-07-12
DE2855880A1 (en) 1980-06-26

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Legal Events

Date Code Title Description
ST Notification of lapse