JPS567557A - Automatic gain control circuit - Google Patents

Automatic gain control circuit

Info

Publication number
JPS567557A
JPS567557A JP8202079A JP8202079A JPS567557A JP S567557 A JPS567557 A JP S567557A JP 8202079 A JP8202079 A JP 8202079A JP 8202079 A JP8202079 A JP 8202079A JP S567557 A JPS567557 A JP S567557A
Authority
JP
Japan
Prior art keywords
joints
level
sections
original
amplifiers
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.)
Pending
Application number
JP8202079A
Other languages
Japanese (ja)
Inventor
Takashi Mitsuoka
Tetsuya Takahashi
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.)
NEC Corp
Original Assignee
NEC Corp
Nippon Electric Co Ltd
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 NEC Corp, Nippon Electric Co Ltd filed Critical NEC Corp
Priority to JP8202079A priority Critical patent/JPS567557A/en
Publication of JPS567557A publication Critical patent/JPS567557A/en
Pending legal-status Critical Current

Links

Classifications

    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04NPICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N1/00Scanning, transmission or reproduction of documents or the like, e.g. facsimile transmission; Details thereof
    • H04N1/40Picture signal circuits
    • H04N1/401Compensating positionally unequal response of the pick-up or reproducing head

Landscapes

  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Control Of Amplification And Gain Control (AREA)
  • Facsimile Heads (AREA)

Abstract

PURPOSE:To realize the good level control operation, by easily removing the level difference at the joints of original, through the level control at the sections corresponding to the joints of original to be transmitted by means of the output signal of the image sensor. CONSTITUTION:At the part corresponding to the joints of original to be transmitted, the waveform of the output signals (a), (b) of the image sensors 4, 5 is similar. In amplifying the signals (a) and (b) at the variable gain amplifiers 11, 15, the gain of the amplifiers 11, 15 is controlled at the level control units 12, 14 so that the signal level at the sections corresponding to the joints can be of the same level. At the sections not corresponding to the joints, the control units 12, 14 are controlled so that the gain of the amplifiers 11, 15 obtained at the sections corresponding to the joints can be stored. The joint detector 13 identifies the sections corresponding to and not corresponding to the joints for the signals (a) and (b) and informs it to the control units 12 and 14.
JP8202079A 1979-06-30 1979-06-30 Automatic gain control circuit Pending JPS567557A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP8202079A JPS567557A (en) 1979-06-30 1979-06-30 Automatic gain control circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP8202079A JPS567557A (en) 1979-06-30 1979-06-30 Automatic gain control circuit

Publications (1)

Publication Number Publication Date
JPS567557A true JPS567557A (en) 1981-01-26

Family

ID=13762831

Family Applications (1)

Application Number Title Priority Date Filing Date
JP8202079A Pending JPS567557A (en) 1979-06-30 1979-06-30 Automatic gain control circuit

Country Status (1)

Country Link
JP (1) JPS567557A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0144089A2 (en) * 1983-12-01 1985-06-12 Fuji Photo Film Co., Ltd. Light detecting apparatus

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5322310A (en) * 1976-08-13 1978-03-01 Toshiba Corp Picture read system

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5322310A (en) * 1976-08-13 1978-03-01 Toshiba Corp Picture read system

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0144089A2 (en) * 1983-12-01 1985-06-12 Fuji Photo Film Co., Ltd. Light detecting apparatus

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