JPS5748871A - Signal processing system - Google Patents

Signal processing system

Info

Publication number
JPS5748871A
JPS5748871A JP12359380A JP12359380A JPS5748871A JP S5748871 A JPS5748871 A JP S5748871A JP 12359380 A JP12359380 A JP 12359380A JP 12359380 A JP12359380 A JP 12359380A JP S5748871 A JPS5748871 A JP S5748871A
Authority
JP
Japan
Prior art keywords
signal
string
error
conversion
reproducing 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.)
Granted
Application number
JP12359380A
Other languages
Japanese (ja)
Other versions
JPH0130342B2 (en
Inventor
Mitsuharu Tadauchi
Kiyohiko Tanno
Yasuyuki Kojima
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.)
Hitachi Ltd
Original Assignee
Hitachi 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 Hitachi Ltd filed Critical Hitachi Ltd
Priority to JP12359380A priority Critical patent/JPS5748871A/en
Publication of JPS5748871A publication Critical patent/JPS5748871A/en
Publication of JPH0130342B2 publication Critical patent/JPH0130342B2/ja
Granted 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
    • H04N1/405—Halftoning, i.e. converting the picture signal of a continuous-tone original into a corresponding signal showing only two levels

Landscapes

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

Abstract

PURPOSE:To make the error of a reproducing signal almost uniform, by converting a shading distortion waveform into a digital signal or inversely changing the potential difference between steps required to convert the digial signal into the reproducing signal, in a reading section of a facsimile device. CONSTITUTION:A peak hold circuit is provided with a comparator 4A, address counter 5, demultiplexer 6, operational amplifier 7, AND gate AND, and resistor string R-S. Taking each step resistor of the string R-S as r0, r1...rm and the potential of each step as V0, V1...Vm, the resistance value of the resistors r0...rm between steps of the string R-S which is used for the conversion of the shading distortion waveform into a digital signal or inversely, for the conversion of it into a reproducing signal, is sequentially increased as geometrical series. Thus, the potential difference of each step is changed and the error is uniformed.
JP12359380A 1980-09-08 1980-09-08 Signal processing system Granted JPS5748871A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP12359380A JPS5748871A (en) 1980-09-08 1980-09-08 Signal processing system

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP12359380A JPS5748871A (en) 1980-09-08 1980-09-08 Signal processing system

Publications (2)

Publication Number Publication Date
JPS5748871A true JPS5748871A (en) 1982-03-20
JPH0130342B2 JPH0130342B2 (en) 1989-06-19

Family

ID=14864441

Family Applications (1)

Application Number Title Priority Date Filing Date
JP12359380A Granted JPS5748871A (en) 1980-09-08 1980-09-08 Signal processing system

Country Status (1)

Country Link
JP (1) JPS5748871A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS58177071A (en) * 1982-04-09 1983-10-17 Fuji Xerox Co Ltd Shading compensation device

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS58177071A (en) * 1982-04-09 1983-10-17 Fuji Xerox Co Ltd Shading compensation device

Also Published As

Publication number Publication date
JPH0130342B2 (en) 1989-06-19

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