JPS57196621A - Digital logarithmic converter - Google Patents

Digital logarithmic converter

Info

Publication number
JPS57196621A
JPS57196621A JP8072981A JP8072981A JPS57196621A JP S57196621 A JPS57196621 A JP S57196621A JP 8072981 A JP8072981 A JP 8072981A JP 8072981 A JP8072981 A JP 8072981A JP S57196621 A JPS57196621 A JP S57196621A
Authority
JP
Japan
Prior art keywords
turns
switch
output
voltage
integrator
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
JP8072981A
Other languages
Japanese (ja)
Inventor
Masahiro Miyamori
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.)
NEC Home Electronics Ltd
NEC Corp
Original Assignee
NEC Home Electronics Ltd
Nippon Electric Co 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 NEC Home Electronics Ltd, Nippon Electric Co Ltd filed Critical NEC Home Electronics Ltd
Priority to JP8072981A priority Critical patent/JPS57196621A/en
Publication of JPS57196621A publication Critical patent/JPS57196621A/en
Pending legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03M—CODING; DECODING; CODE CONVERSION IN GENERAL
    • H03M1/00—Analogue/digital conversion; Digital/analogue conversion
    • H03M1/12—Analogue/digital converters
    • H03M1/50—Analogue/digital converters with intermediate conversion to time interval
    • H03M1/58—Non-linear conversion

Landscapes

  • Physics & Mathematics (AREA)
  • Nonlinear Science (AREA)
  • Engineering & Computer Science (AREA)
  • Theoretical Computer Science (AREA)
  • Analogue/Digital Conversion (AREA)

Abstract

PURPOSE:To perform logarithmic conversion and A/D conversion at the same time, by integrating an input signal for a described period, discharging the signal with a prescribed time constant and counting clock pulses for the period reaching to a reference voltage. CONSTITUTION:When a start pulse SP is applied, a countre 13 is reset, an FF16 is set, a switch 3 turns on with outputs Q and Q', switch 8 turns off and an integrator 6 integrates an input voltage E1. When the counter 13 counts a clock pulse CP and the count value reaches a maximum value, a carry output CL is produced, the FF16 is reset, the switch 3 turns off and the 8 turns on. A charge proportional to the input voltage E1 of the integrator 6 charged to a capacitor 5 is discharged via a resistor 7, and when the output voltage reaches a reference voltage ER, a gate circuit 12 is closed with an output CO of a comparator 9 and the counter 13 stops the counting of the clock pulse.
JP8072981A 1981-05-29 1981-05-29 Digital logarithmic converter Pending JPS57196621A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP8072981A JPS57196621A (en) 1981-05-29 1981-05-29 Digital logarithmic converter

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP8072981A JPS57196621A (en) 1981-05-29 1981-05-29 Digital logarithmic converter

Publications (1)

Publication Number Publication Date
JPS57196621A true JPS57196621A (en) 1982-12-02

Family

ID=13726455

Family Applications (1)

Application Number Title Priority Date Filing Date
JP8072981A Pending JPS57196621A (en) 1981-05-29 1981-05-29 Digital logarithmic converter

Country Status (1)

Country Link
JP (1) JPS57196621A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS60157337A (en) * 1984-01-26 1985-08-17 Sony Corp Analog-to-digital converter
JPH04100724U (en) * 1991-01-28 1992-08-31
WO2003016845A1 (en) * 2001-08-10 2003-02-27 Kazuhito Sakano Physical quantity measuring method, temperature measuring method by infrared thermometer, physical quantity measuring device, and infrared thermometer

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS60157337A (en) * 1984-01-26 1985-08-17 Sony Corp Analog-to-digital converter
JPH04100724U (en) * 1991-01-28 1992-08-31
WO2003016845A1 (en) * 2001-08-10 2003-02-27 Kazuhito Sakano Physical quantity measuring method, temperature measuring method by infrared thermometer, physical quantity measuring device, and infrared thermometer

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