JPS572116A - Digital filter device - Google Patents

Digital filter device

Info

Publication number
JPS572116A
JPS572116A JP7601080A JP7601080A JPS572116A JP S572116 A JPS572116 A JP S572116A JP 7601080 A JP7601080 A JP 7601080A JP 7601080 A JP7601080 A JP 7601080A JP S572116 A JPS572116 A JP S572116A
Authority
JP
Japan
Prior art keywords
coefficient
register
switched
clock
phi1
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
JP7601080A
Other languages
Japanese (ja)
Other versions
JPS6336577B2 (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 JP7601080A priority Critical patent/JPS572116A/en
Publication of JPS572116A publication Critical patent/JPS572116A/en
Publication of JPS6336577B2 publication Critical patent/JPS6336577B2/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
    • H03H17/04—Recursive filters

Landscapes

  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Computer Hardware Design (AREA)
  • Mathematical Physics (AREA)
  • Complex Calculations (AREA)
  • Electrophonic Musical Instruments (AREA)

Abstract

PURPOSE:To reduce the contents of an ROM and at the same time to eliminate the unnaturalness during a switching mode, by carrying out an interpolation from the coefficient before switching to the coefficient after switching when the characteristics is switched for a filter which is used to an electronic musical instrument or the like. CONSTITUTION:The characteristics of a digital filter is switched by selecting the coefficient e.g. KB that is stored in an ROM and by renewing the coefficient KA applied to a multiplier via an interpolating circuit 15. The clock phi1 plus the clock phi2 which turns the 4 cycles of phi1 into a cycle are supplied to the circuit 15. The coefficient KA is held at a register 18 when the characteristics is switched, and the coefficient KB is supplied to a register 16 in the form of KI. The output KB-KA of a substractor 17 receives a 1/4 multiplication through a shifting circuit 19 and latched at a register 20 in the form of DELTAK and after an addition 19 to be held until the next clock phi2. The register 18 latched the DELTAK with every clock phi1, and the output KO to the multiplier is interpolated in steps from KA to KB.
JP7601080A 1980-06-05 1980-06-05 Digital filter device Granted JPS572116A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP7601080A JPS572116A (en) 1980-06-05 1980-06-05 Digital filter device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP7601080A JPS572116A (en) 1980-06-05 1980-06-05 Digital filter device

Publications (2)

Publication Number Publication Date
JPS572116A true JPS572116A (en) 1982-01-07
JPS6336577B2 JPS6336577B2 (en) 1988-07-20

Family

ID=13592841

Family Applications (1)

Application Number Title Priority Date Filing Date
JP7601080A Granted JPS572116A (en) 1980-06-05 1980-06-05 Digital filter device

Country Status (1)

Country Link
JP (1) JPS572116A (en)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6211895A (en) * 1985-07-10 1987-01-20 カシオ計算機株式会社 Electronic musical instrument
JPS62179211A (en) * 1986-02-03 1987-08-06 Victor Co Of Japan Ltd Digital graphic equalizer
JPS63168695A (en) * 1986-12-30 1988-07-12 ヤマハ株式会社 Musical sound signal generator
JPH01300712A (en) * 1988-05-30 1989-12-05 Sony Corp Frequency characteristic control circuit
JPH09134176A (en) * 1996-05-20 1997-05-20 Yamaha Corp Musical sound signal generating device

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2014204213A (en) * 2013-04-03 2014-10-27 パイオニア株式会社 Digital filter and filter characteristic modification method

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6211895A (en) * 1985-07-10 1987-01-20 カシオ計算機株式会社 Electronic musical instrument
JPS62179211A (en) * 1986-02-03 1987-08-06 Victor Co Of Japan Ltd Digital graphic equalizer
JPS63168695A (en) * 1986-12-30 1988-07-12 ヤマハ株式会社 Musical sound signal generator
JPH0754432B2 (en) * 1986-12-30 1995-06-07 ヤマハ株式会社 Music signal generator
JPH01300712A (en) * 1988-05-30 1989-12-05 Sony Corp Frequency characteristic control circuit
JPH09134176A (en) * 1996-05-20 1997-05-20 Yamaha Corp Musical sound signal generating device

Also Published As

Publication number Publication date
JPS6336577B2 (en) 1988-07-20

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