JPS5591079A - A/d converter - Google Patents

A/d converter

Info

Publication number
JPS5591079A
JPS5591079A JP16198878A JP16198878A JPS5591079A JP S5591079 A JPS5591079 A JP S5591079A JP 16198878 A JP16198878 A JP 16198878A JP 16198878 A JP16198878 A JP 16198878A JP S5591079 A JPS5591079 A JP S5591079A
Authority
JP
Japan
Prior art keywords
output
potential
value
counter
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
JP16198878A
Other languages
Japanese (ja)
Other versions
JPS5917476B2 (en
Inventor
Mitsuo Oiso
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 JP53161988A priority Critical patent/JPS5917476B2/en
Publication of JPS5591079A publication Critical patent/JPS5591079A/en
Publication of JPS5917476B2 publication Critical patent/JPS5917476B2/en
Expired legal-status Critical Current

Links

Landscapes

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

Abstract

PURPOSE: To secure the simple decision for the reference potential under detection of characters by increasing the counter value when the input signal is higher than the 1st potential, decreasing the counter value when the input signal is at the middle value between the 1st and 2nd potential, and keeping the counter value when the input signal is lower than the 2nd potential respectively.
CONSTITUTION: Analog detection signal 1 detected through the photo detector is applied to comparators 31 and 32 each, and output 2 of D/A converter 6 is applied to the other input of comparator 31. At the same time, output 3 obtained by giving the voltage division to the output of converter 6 via voltage divider 7 is applied to comparator 32. Then the value of counter 5 is increased when the output of comparators 31 and 32 is higher than the 1st potential, and the counter value is decreased when the output is lower than the 2nd potential. And furthermore, the value of the counter is held in case the output features the middle value between the 1st and 2nd potential. Then the output of counter 5 is applied to converter 6, and the control is given to A/D converter 2 which converts the analog signal of input signal 1 into the digital signal via output 3 passed through divider 7. Thus the reference potential can be set in a simple way.
COPYRIGHT: (C)1980,JPO&Japio
JP53161988A 1978-12-29 1978-12-29 A/D converter Expired JPS5917476B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP53161988A JPS5917476B2 (en) 1978-12-29 1978-12-29 A/D converter

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP53161988A JPS5917476B2 (en) 1978-12-29 1978-12-29 A/D converter

Publications (2)

Publication Number Publication Date
JPS5591079A true JPS5591079A (en) 1980-07-10
JPS5917476B2 JPS5917476B2 (en) 1984-04-21

Family

ID=15745892

Family Applications (1)

Application Number Title Priority Date Filing Date
JP53161988A Expired JPS5917476B2 (en) 1978-12-29 1978-12-29 A/D converter

Country Status (1)

Country Link
JP (1) JPS5917476B2 (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5878262A (en) * 1981-11-04 1983-05-11 Omron Tateisi Electronics Co Defect detector
JPS62104216A (en) * 1985-08-12 1987-05-14 シリコン・システムズ・インコ−ポレ−テツド Method and apparatus for providing dynamic noise floor level

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5878262A (en) * 1981-11-04 1983-05-11 Omron Tateisi Electronics Co Defect detector
JPH0346871B2 (en) * 1981-11-04 1991-07-17 Omuron Kk
JPS62104216A (en) * 1985-08-12 1987-05-14 シリコン・システムズ・インコ−ポレ−テツド Method and apparatus for providing dynamic noise floor level

Also Published As

Publication number Publication date
JPS5917476B2 (en) 1984-04-21

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