JPS564978A - Binary deciding circuit - Google Patents

Binary deciding circuit

Info

Publication number
JPS564978A
JPS564978A JP8051479A JP8051479A JPS564978A JP S564978 A JPS564978 A JP S564978A JP 8051479 A JP8051479 A JP 8051479A JP 8051479 A JP8051479 A JP 8051479A JP S564978 A JPS564978 A JP S564978A
Authority
JP
Japan
Prior art keywords
signal
level
contrast
comparator
trip
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
JP8051479A
Other languages
Japanese (ja)
Other versions
JPS6031387B2 (en
Inventor
Eiji Morotomi
Hideki Uesugi
Shigeru Yamasuda
Motoyoshi Nagai
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.)
Panasonic System Solutions Japan Co Ltd
Original Assignee
Matsushita Graphic Communication Systems Inc
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 Matsushita Graphic Communication Systems Inc filed Critical Matsushita Graphic Communication Systems Inc
Priority to JP54080514A priority Critical patent/JPS6031387B2/en
Publication of JPS564978A publication Critical patent/JPS564978A/en
Publication of JPS6031387B2 publication Critical patent/JPS6031387B2/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N1/00—Scanning, transmission or reproduction of documents or the like, e.g. facsimile transmission; Details thereof
    • H04N1/40—Picture signal circuits
    • H04N1/403—Discrimination between the two tones in the picture signal of a two-tone original

Landscapes

  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Image Input (AREA)
  • Facsimile Image Signal Circuits (AREA)

Abstract

PURPOSE:To enable the level of either trip point to vary with the contrast of an original, by providing the operation of a comparator with two trip points with hysteresis characteristics. CONSTITUTION:Analog comparator 2 switches analog signal (a) from input terminal 1 at two trip points to convert it into digital signal (g). Then, amplifying circuit 4 amplifies analog signal (a) to a level needed for integrating circuit 5 to operate. The integrating circuit performs by analog signal (a) integration with an adequate time constant to obtain signal (d) corresponding to the contrast of an original. Level change-over circuit 6 changes the level of signal (d) over to signal (e) further adequate to the contrast of the orginal. Receiving signal (g) as an input, inverter 7 controls the ''-'' terminal of comparator 2 by inverted signal (b) through diode 8 to generate the timing of one fixed trip point between two trip points. Diode 8 controls signal (e) by signal (b) to generate the level of the fixed trip point.
JP54080514A 1979-06-26 1979-06-26 Binary discrimination circuit Expired JPS6031387B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP54080514A JPS6031387B2 (en) 1979-06-26 1979-06-26 Binary discrimination circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP54080514A JPS6031387B2 (en) 1979-06-26 1979-06-26 Binary discrimination circuit

Publications (2)

Publication Number Publication Date
JPS564978A true JPS564978A (en) 1981-01-19
JPS6031387B2 JPS6031387B2 (en) 1985-07-22

Family

ID=13720417

Family Applications (1)

Application Number Title Priority Date Filing Date
JP54080514A Expired JPS6031387B2 (en) 1979-06-26 1979-06-26 Binary discrimination circuit

Country Status (1)

Country Link
JP (1) JPS6031387B2 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS61199180A (en) * 1985-03-01 1986-09-03 Nissan Motor Co Ltd Binary-coding circuit

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS61199180A (en) * 1985-03-01 1986-09-03 Nissan Motor Co Ltd Binary-coding circuit

Also Published As

Publication number Publication date
JPS6031387B2 (en) 1985-07-22

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