JPS5496347A - A-d converter - Google Patents

A-d converter

Info

Publication number
JPS5496347A
JPS5496347A JP277178A JP277178A JPS5496347A JP S5496347 A JPS5496347 A JP S5496347A JP 277178 A JP277178 A JP 277178A JP 277178 A JP277178 A JP 277178A JP S5496347 A JPS5496347 A JP S5496347A
Authority
JP
Japan
Prior art keywords
video signal
voltage
comparators
base
supplied
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
JP277178A
Other languages
Japanese (ja)
Inventor
Hisao Hanmura
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 JP277178A priority Critical patent/JPS5496347A/en
Priority to NL7810125A priority patent/NL7810125A/en
Priority to DE19782843706 priority patent/DE2843706A1/en
Priority to FR7828647A priority patent/FR2405603A1/en
Priority to GB7839652A priority patent/GB2006569A/en
Publication of JPS5496347A publication Critical patent/JPS5496347A/en
Pending legal-status Critical Current

Links

Landscapes

  • Analogue/Digital Conversion (AREA)

Abstract

PURPOSE: To secure the high-speed operation for A-D converter with reduced number of comparators as well as enhanced effective resolution, by adding the counter which counts the number of the picture frames.
CONSTITUTION: Vertical synchronous signal SV is supplied to counter CNT and then divided, and the output is voltage-divided with resistance R4 and R3. And addition voltage FC whose voltage value switches between 0 and E in the even field is obtained at the odd field. At the same time, video signal VI is supplied to the base of transistor TrQ via amplifier A and capacitor C. When the base potential is going to lower less than FC, diode D conducts to charge C. As a result, the video signal at the base side of Q is always in agreement with FC. The scale of E is 1/15 the difference voltage between the black and white levels of the video signal and eqivalent to one gradation of the effective luminance. Then video signal VD delivered from the emitter of Q is applied to the plus(+) input of comparators C1∼C7, and logic gates G1∼G4 encode the comparator output to 3-bit digital video signals DV0 DV2.
COPYRIGHT: (C)1979,JPO&Japio
JP277178A 1977-10-07 1978-01-17 A-d converter Pending JPS5496347A (en)

Priority Applications (5)

Application Number Priority Date Filing Date Title
JP277178A JPS5496347A (en) 1978-01-17 1978-01-17 A-d converter
NL7810125A NL7810125A (en) 1977-10-07 1978-10-06 IMAGE DISPLAY SYSTEM.
DE19782843706 DE2843706A1 (en) 1977-10-07 1978-10-06 IMAGE PLAYBACK SYSTEM
FR7828647A FR2405603A1 (en) 1977-10-07 1978-10-06 IMAGE PRESENTATION DEVICE
GB7839652A GB2006569A (en) 1977-10-07 1978-10-06 A flat panel image display system

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP277178A JPS5496347A (en) 1978-01-17 1978-01-17 A-d converter

Publications (1)

Publication Number Publication Date
JPS5496347A true JPS5496347A (en) 1979-07-30

Family

ID=11538591

Family Applications (1)

Application Number Title Priority Date Filing Date
JP277178A Pending JPS5496347A (en) 1977-10-07 1978-01-17 A-d converter

Country Status (1)

Country Link
JP (1) JPS5496347A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS60169228A (en) * 1984-02-13 1985-09-02 Victor Co Of Japan Ltd Ad conversion circuit
JPH01135812U (en) * 1988-03-11 1989-09-18

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS60169228A (en) * 1984-02-13 1985-09-02 Victor Co Of Japan Ltd Ad conversion circuit
JPH01135812U (en) * 1988-03-11 1989-09-18

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