JPS56137724A - Digital filter device - Google Patents

Digital filter device

Info

Publication number
JPS56137724A
JPS56137724A JP3998080A JP3998080A JPS56137724A JP S56137724 A JPS56137724 A JP S56137724A JP 3998080 A JP3998080 A JP 3998080A JP 3998080 A JP3998080 A JP 3998080A JP S56137724 A JPS56137724 A JP S56137724A
Authority
JP
Japan
Prior art keywords
frequency
multiplier
coefficient
bits
filter device
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
JP3998080A
Other languages
Japanese (ja)
Other versions
JPS6336573B2 (en
Inventor
Shigenori Sano
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.)
Casio Computer Co Ltd
Original Assignee
Casio Computer 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 Casio Computer Co Ltd filed Critical Casio Computer Co Ltd
Priority to JP3998080A priority Critical patent/JPS56137724A/en
Publication of JPS56137724A publication Critical patent/JPS56137724A/en
Publication of JPS6336573B2 publication Critical patent/JPS6336573B2/ja
Granted legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03H—IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
    • H03H17/00—Networks using digital techniques
    • H03H17/02—Frequency selective networks
    • H03H17/0294—Variable filters; Programmable filters
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03H—IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
    • H03H17/00—Networks using digital techniques
    • H03H17/02—Frequency selective networks
    • H03H17/0223—Computation saving measures; Accelerating measures
    • H03H17/0227—Measures concerning the coefficients
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03H—IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
    • H03H17/00—Networks using digital techniques
    • H03H17/02—Frequency selective networks
    • H03H17/04—Recursive filters

Landscapes

  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Computer Hardware Design (AREA)
  • Mathematical Physics (AREA)
  • Computing Systems (AREA)
  • Theoretical Computer Science (AREA)
  • Complex Calculations (AREA)

Abstract

PURPOSE:To reduce memory capacity for coefficient storage in a digital filter device which is variable in cut-off frequency, by approximating at least one of coefficients of a transfer function to a straight line, polygonal line or curved line. CONSTITUTION:Coefficient b1 supplied to multiplier 4 is -2+fcX2<-2> (where fc is a cut-off frequency). Logic circuit 10 is provided to multiplier 4. Here, frequency fc is 14-bit data consisting of four bits above the decimal point and ten bits below the decimal point, and its unit is ''kHz''. Therefore, frequency fc is 16kHz at a maximum and the minimum range of frequency fc is 2<-10>kHz. For the arithmetic, 14-bits data is shifted to right by two bits and [-2] is added. On the other hand, ROM6' is stored with coefficient b2 to multiplier 8 and coefficient (k) of multiplier 9.
JP3998080A 1980-03-28 1980-03-28 Digital filter device Granted JPS56137724A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP3998080A JPS56137724A (en) 1980-03-28 1980-03-28 Digital filter device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP3998080A JPS56137724A (en) 1980-03-28 1980-03-28 Digital filter device

Publications (2)

Publication Number Publication Date
JPS56137724A true JPS56137724A (en) 1981-10-27
JPS6336573B2 JPS6336573B2 (en) 1988-07-20

Family

ID=12568088

Family Applications (1)

Application Number Title Priority Date Filing Date
JP3998080A Granted JPS56137724A (en) 1980-03-28 1980-03-28 Digital filter device

Country Status (1)

Country Link
JP (1) JPS56137724A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH02159920A (en) * 1988-12-08 1990-06-20 Hitachi Ltd Operation processing method for protective relay and protective relay device
EP0751369A2 (en) * 1995-06-30 1997-01-02 Carl Zeiss Method for filtering measured values of curves

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH02159920A (en) * 1988-12-08 1990-06-20 Hitachi Ltd Operation processing method for protective relay and protective relay device
EP0751369A2 (en) * 1995-06-30 1997-01-02 Carl Zeiss Method for filtering measured values of curves
EP0751369A3 (en) * 1995-06-30 1997-11-26 Carl Zeiss Method for filtering measured values of curves

Also Published As

Publication number Publication date
JPS6336573B2 (en) 1988-07-20

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