JPS54104265A - Gain control circuit - Google Patents

Gain control circuit

Info

Publication number
JPS54104265A
JPS54104265A JP1075678A JP1075678A JPS54104265A JP S54104265 A JPS54104265 A JP S54104265A JP 1075678 A JP1075678 A JP 1075678A JP 1075678 A JP1075678 A JP 1075678A JP S54104265 A JPS54104265 A JP S54104265A
Authority
JP
Japan
Prior art keywords
converter
supplied
control circuit
signal
semipeak
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.)
Granted
Application number
JP1075678A
Other languages
Japanese (ja)
Other versions
JPS6147034B2 (en
Inventor
Fumio Nagumo
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.)
Sony Corp
Original Assignee
Sony 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 Sony Corp filed Critical Sony Corp
Priority to JP1075678A priority Critical patent/JPS54104265A/en
Publication of JPS54104265A publication Critical patent/JPS54104265A/en
Publication of JPS6147034B2 publication Critical patent/JPS6147034B2/ja
Granted 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

Landscapes

  • Color Television Systems (AREA)
  • Color Television Image Signal Generators (AREA)
  • Processing Of Color Television Signals (AREA)
  • Control Of Amplification And Gain Control (AREA)

Abstract

PURPOSE:To obtain a control circuit which can control the level of a signal obtained from a television camera, etc., to a constant value easily, by making use of characteristics of an A/D converter. CONSTITUTION:A black-and-white video signal, supplied to input terminal 1 from a pickup unit, for example, is supplied to via DC regenerating circuit 2 to A/D converter 3, where it is converted into a digital signal and then extracted from output terminal 4. This digital signal is supplied to D/A converter 5 and then converted into an analog signal, which is semipeak-detected by semipeak detection circuit 6. Comparator 7 compares this detection voltage with reference voltage E0 and a voltage equivalent to the difference between the both is supplied to A/D converter 3 as its comparative reference voltage.
JP1075678A 1978-02-02 1978-02-02 Gain control circuit Granted JPS54104265A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP1075678A JPS54104265A (en) 1978-02-02 1978-02-02 Gain control circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP1075678A JPS54104265A (en) 1978-02-02 1978-02-02 Gain control circuit

Publications (2)

Publication Number Publication Date
JPS54104265A true JPS54104265A (en) 1979-08-16
JPS6147034B2 JPS6147034B2 (en) 1986-10-17

Family

ID=11759157

Family Applications (1)

Application Number Title Priority Date Filing Date
JP1075678A Granted JPS54104265A (en) 1978-02-02 1978-02-02 Gain control circuit

Country Status (1)

Country Link
JP (1) JPS54104265A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5820092A (en) * 1981-07-29 1983-02-05 Toshiba Corp Automatic control system of color television camera
JPS5986987A (en) * 1982-11-10 1984-05-19 Matsushita Electric Ind Co Ltd Color camera device
JPH0713540A (en) * 1993-06-21 1995-01-17 Nec Corp Transparent color processing circuit

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3670100A (en) * 1971-03-29 1972-06-13 Telemation Automatic reference level set for television cameras
US4063280A (en) * 1975-09-30 1977-12-13 Matsushita Electric Industrial Co., Ltd. Chroma-signal processing system

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3670100A (en) * 1971-03-29 1972-06-13 Telemation Automatic reference level set for television cameras
US4063280A (en) * 1975-09-30 1977-12-13 Matsushita Electric Industrial Co., Ltd. Chroma-signal processing system

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5820092A (en) * 1981-07-29 1983-02-05 Toshiba Corp Automatic control system of color television camera
JPH0461558B2 (en) * 1981-07-29 1992-10-01 Tokyo Shibaura Electric Co
JPS5986987A (en) * 1982-11-10 1984-05-19 Matsushita Electric Ind Co Ltd Color camera device
JPS6345153B2 (en) * 1982-11-10 1988-09-08 Matsushita Electric Ind Co Ltd
JPH0713540A (en) * 1993-06-21 1995-01-17 Nec Corp Transparent color processing circuit

Also Published As

Publication number Publication date
JPS6147034B2 (en) 1986-10-17

Similar Documents

Publication Publication Date Title
SE8300804D0 (en) DEVICE FOR DIGITAL AUTOMATIC AMPLIFIER CONTROL
JPS5558681A (en) Time base error correcting circuit of video signal
JPS5746573A (en) Picture signal processing device
JPS5660165A (en) Picture reader
JPS5675780A (en) Video signal processing circuit
EP0178044A3 (en) Analogue-to-digital converting apparatus for video signals
JPS5761327A (en) Periodicity pulse extraction circuit
JPS54104265A (en) Gain control circuit
JPS5534704A (en) Threshold setting circuit
JPS5683181A (en) Television camera device
JPS56126390A (en) A-d converting circuit of video signal
JPS5539443A (en) Converter for catv
JPS5625827A (en) Coding unit
JPS57208770A (en) Dc level automatic compensating circuit for analog signal repetitively including reference level signal
JPS56126392A (en) Picture tracking device
JPS57154978A (en) Dc reproducing and synchronous separating circuit
JPS54153673A (en) Peak value detector
JPS5526742A (en) Automatic picture-quality regulator circuit
JPS5592081A (en) Adjustment unit of television receiver
JPS5742282A (en) A/d converter for output video signal of vtr
JPS5725076A (en) Method for binary-coding of video signal
JPS5478019A (en) Video control circuit of television receiver
JPS5714264A (en) Analog-to-digital converter
JPS54153530A (en) Recording system for color video signal
JPS57116477A (en) Scanning type document reader