JPS5720011A - Digital filter device - Google Patents

Digital filter device

Info

Publication number
JPS5720011A
JPS5720011A JP9446280A JP9446280A JPS5720011A JP S5720011 A JPS5720011 A JP S5720011A JP 9446280 A JP9446280 A JP 9446280A JP 9446280 A JP9446280 A JP 9446280A JP S5720011 A JPS5720011 A JP S5720011A
Authority
JP
Japan
Prior art keywords
multiplier
adder
supplied
coefficient
coefficients
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
JP9446280A
Other languages
Japanese (ja)
Inventor
Shigenori Sano
Kotaro Hanzawa
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 JP9446280A priority Critical patent/JPS5720011A/en
Priority to US06/279,630 priority patent/US4467440A/en
Priority to GB8120520A priority patent/GB2080068B/en
Priority to DE19813127189 priority patent/DE3127189C2/en
Publication of JPS5720011A publication Critical patent/JPS5720011A/en
Pending 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
    • H03H17/04—Recursive filters
    • H03H17/0405—Recursive filters comprising a ROM addressed by the input and output data signals

Landscapes

  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Computer Hardware Design (AREA)
  • Mathematical Physics (AREA)
  • Tone Control, Compression And Expansion, Limiting Amplitude (AREA)

Abstract

PURPOSE:To obtain resonance characteristics without increasing the capacity of an ROM for coefficient storage by giving amplitude caracteristics a peak by increasing or decreasing some of coefficients of a transfer function. CONSTITUTION:In an ROM6', coefficients b1 and b2 are stored which correspond to cutoff frequencies, and a coefficient K to be supplied to a multiplier 9 is calculated by an arithmetic circuit 10 by using the coefficients b1 and b2. An arithmetic circuit 11 operaters the coefficient b2 supplied from the ROM6' to calculate a coefficient b2n, which is supplied to a multiplier 8. The outputs of multipliers 4 and 8 are subtracted from and added to an input signal by an adder 1 and to the output of the adder 1, the outputs of a multiplier 5 and a delay circuit 5 are added by an adder 2. The output of the adder 2 is multiplied by K at the multiplier 9 to obtain an output signal. An a result, the cutoff frequency is equivalent to the resonance frequency of this device and according to combinations of logical levels of control signals n-infinity , n0 and n1 supplied to the circuit 11, the depth of a resonance level is controlled.
JP9446280A 1980-07-09 1980-07-09 Digital filter device Pending JPS5720011A (en)

Priority Applications (4)

Application Number Priority Date Filing Date Title
JP9446280A JPS5720011A (en) 1980-07-09 1980-07-09 Digital filter device
US06/279,630 US4467440A (en) 1980-07-09 1981-07-01 Digital filter apparatus with resonance characteristics
GB8120520A GB2080068B (en) 1980-07-09 1981-07-02 Digital filter apparatus
DE19813127189 DE3127189C2 (en) 1980-07-09 1981-07-09 Digital filter device with resonance properties

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP9446280A JPS5720011A (en) 1980-07-09 1980-07-09 Digital filter device

Publications (1)

Publication Number Publication Date
JPS5720011A true JPS5720011A (en) 1982-02-02

Family

ID=14110935

Family Applications (1)

Application Number Title Priority Date Filing Date
JP9446280A Pending JPS5720011A (en) 1980-07-09 1980-07-09 Digital filter device

Country Status (1)

Country Link
JP (1) JPS5720011A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS61258521A (en) * 1985-05-13 1986-11-15 Hitachi Ltd Digital filter

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS61258521A (en) * 1985-05-13 1986-11-15 Hitachi Ltd Digital filter

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