JPS6465927A - Automatic gain switching system for a/d converter - Google Patents

Automatic gain switching system for a/d converter

Info

Publication number
JPS6465927A
JPS6465927A JP22280687A JP22280687A JPS6465927A JP S6465927 A JPS6465927 A JP S6465927A JP 22280687 A JP22280687 A JP 22280687A JP 22280687 A JP22280687 A JP 22280687A JP S6465927 A JPS6465927 A JP S6465927A
Authority
JP
Japan
Prior art keywords
gain
prescribed
level
hold
conversion
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
JP22280687A
Other languages
Japanese (ja)
Inventor
Keiichiro Igata
Takuo Ishii
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
Fuji Facom Corp
Original Assignee
Fujitsu Ltd
Fuji Facom Corp
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, Fuji Facom Corp filed Critical Fujitsu Ltd
Priority to JP22280687A priority Critical patent/JPS6465927A/en
Publication of JPS6465927A publication Critical patent/JPS6465927A/en
Pending legal-status Critical Current

Links

Landscapes

  • Analogue/Digital Conversion (AREA)

Abstract

PURPOSE:To perform AD conversion without a hold error by sampling-holding prescribed times at every A-D conversion, controlling a gain by a prescribed gain step unit, and performing the A-D conversion according to the finally set gain. CONSTITUTION:When a digital conversion instruction is issued (AD converter is started), the output of an amplifier 5 is sample-held prescribed times by a sample-hold circuit SH, and the hold output level Vn of every sample is detected, and the rate of change of the level of an analog input signal IMA is calculated. According to this level change rate data 52, the hold output level Vyn+1 at the time of next sampling is forecast by, for instance, a primary forecasting method. Then, the forecast output level Vyn+1 and the present hold output level Vn are compared respectively with the maximum value Vmax and the minimum value Vmin in a prescribed level range, and when one of them exceeds Vmax, the gain of the amplifier 5 is raised by a prescribed gain step portion. Besides, when both of them are lower than Vmin, the gain of the amplifier 5 is raised by the prescribed gain step portion, and in other cases, the gain is left as it is.
JP22280687A 1987-09-04 1987-09-04 Automatic gain switching system for a/d converter Pending JPS6465927A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP22280687A JPS6465927A (en) 1987-09-04 1987-09-04 Automatic gain switching system for a/d converter

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP22280687A JPS6465927A (en) 1987-09-04 1987-09-04 Automatic gain switching system for a/d converter

Publications (1)

Publication Number Publication Date
JPS6465927A true JPS6465927A (en) 1989-03-13

Family

ID=16788188

Family Applications (1)

Application Number Title Priority Date Filing Date
JP22280687A Pending JPS6465927A (en) 1987-09-04 1987-09-04 Automatic gain switching system for a/d converter

Country Status (1)

Country Link
JP (1) JPS6465927A (en)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH09135134A (en) * 1995-11-09 1997-05-20 Nikon Corp Gain setting method
JP2001136036A (en) * 1999-11-09 2001-05-18 Denso Corp Sampling device
JP2007306306A (en) * 2006-05-11 2007-11-22 Chugoku Electric Power Co Inc:The Signal processing apparatus, electric energy measuring instrument, method for changing gain of signal processing apparatus, and program
JP2017175215A (en) * 2016-03-18 2017-09-28 ヤマハ株式会社 A/d converter
JP2020155931A (en) * 2019-03-20 2020-09-24 ヤマハ株式会社 A/d conversion device and a/d conversion method

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS55121922A (en) * 1979-03-07 1980-09-19 Nippon Telegr & Teleph Corp <Ntt> Manufacture of optical fiber mother material
JPS60177712A (en) * 1984-01-31 1985-09-11 アナロジツク　コ−ポレ−シヨン Multichanne gain predicting amplifier system

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS55121922A (en) * 1979-03-07 1980-09-19 Nippon Telegr & Teleph Corp <Ntt> Manufacture of optical fiber mother material
JPS60177712A (en) * 1984-01-31 1985-09-11 アナロジツク　コ−ポレ−シヨン Multichanne gain predicting amplifier system

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH09135134A (en) * 1995-11-09 1997-05-20 Nikon Corp Gain setting method
JP2001136036A (en) * 1999-11-09 2001-05-18 Denso Corp Sampling device
JP2007306306A (en) * 2006-05-11 2007-11-22 Chugoku Electric Power Co Inc:The Signal processing apparatus, electric energy measuring instrument, method for changing gain of signal processing apparatus, and program
JP2017175215A (en) * 2016-03-18 2017-09-28 ヤマハ株式会社 A/d converter
JP2020155931A (en) * 2019-03-20 2020-09-24 ヤマハ株式会社 A/d conversion device and a/d conversion method
WO2020189106A1 (en) * 2019-03-20 2020-09-24 ヤマハ株式会社 A/d conversion device and a/d conversion method
US11894858B2 (en) 2019-03-20 2024-02-06 Yamaha Corporation A/D conversion device and A/D conversion method

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