JPS5614378A - A/d converter - Google Patents

A/d converter

Info

Publication number
JPS5614378A
JPS5614378A JP9006379A JP9006379A JPS5614378A JP S5614378 A JPS5614378 A JP S5614378A JP 9006379 A JP9006379 A JP 9006379A JP 9006379 A JP9006379 A JP 9006379A JP S5614378 A JPS5614378 A JP S5614378A
Authority
JP
Japan
Prior art keywords
output
input
signal
comparator
converter
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
JP9006379A
Other languages
Japanese (ja)
Other versions
JPS5953593B2 (en
Inventor
Norio Kanemitsu
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.)
Fujitsu Ltd
Original Assignee
Fujitsu 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 Fujitsu Ltd filed Critical Fujitsu Ltd
Priority to JP54090063A priority Critical patent/JPS5953593B2/en
Publication of JPS5614378A publication Critical patent/JPS5614378A/en
Publication of JPS5953593B2 publication Critical patent/JPS5953593B2/en
Expired legal-status Critical Current

Links

Landscapes

  • Character Input (AREA)
  • Manipulation Of Pulses (AREA)

Abstract

PURPOSE: To eliminate the defect of redundant fluctuation, by comparing preceding and current input signal levels in picture scanning with each other and by switching the fluctuation width of the white level, which becomes a reference, on a basis of the comparison result by the % unit of the input signal level.
CONSTITUTION: Analogue detection signal (1) from input end 1 is applied to A/D converter 2 and is converted to a digital signal with signal (2) output from D/A converter 6 as a reference potential. Detection signal (1) from this input end is input to one inputs of comparators 31 and 32, and signal (2) output from converter 6 is applied to the other input of comparator 31, and output 3 obtained by dividing output 2 of converter 6 by voltage divider 7 is applied to the other input of comparator 32. If detection signal (1)>output (2)o is true, the output of comparator 31 is sent to up/down counter 5 to increase the count value; and further, if output (2)>detection signal (1)>output (3) is ture, the inversion signal of the output of comparator 31 and the output of comparator 32 are applied to counter 5 through AND circuit 4 to reduce the count value, thus switching the input level by the % unit.
COPYRIGHT: (C)1981,JPO&Japio
JP54090063A 1979-07-16 1979-07-16 A/D converter Expired JPS5953593B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP54090063A JPS5953593B2 (en) 1979-07-16 1979-07-16 A/D converter

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP54090063A JPS5953593B2 (en) 1979-07-16 1979-07-16 A/D converter

Publications (2)

Publication Number Publication Date
JPS5614378A true JPS5614378A (en) 1981-02-12
JPS5953593B2 JPS5953593B2 (en) 1984-12-26

Family

ID=13988091

Family Applications (1)

Application Number Title Priority Date Filing Date
JP54090063A Expired JPS5953593B2 (en) 1979-07-16 1979-07-16 A/D converter

Country Status (1)

Country Link
JP (1) JPS5953593B2 (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS58101375A (en) * 1981-12-10 1983-06-16 Fujitsu Ltd Initial value set system for white level follower
JPS60163528A (en) * 1984-02-06 1985-08-26 Matsushita Electric Ind Co Ltd Data waveform shaping circuit
JPS6258982U (en) * 1985-09-30 1987-04-11

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS58101375A (en) * 1981-12-10 1983-06-16 Fujitsu Ltd Initial value set system for white level follower
JPH0232672B2 (en) * 1981-12-10 1990-07-23 Fujitsu Ltd
JPS60163528A (en) * 1984-02-06 1985-08-26 Matsushita Electric Ind Co Ltd Data waveform shaping circuit
JPS6258982U (en) * 1985-09-30 1987-04-11

Also Published As

Publication number Publication date
JPS5953593B2 (en) 1984-12-26

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