JPS5721116A - Digital filter device - Google Patents

Digital filter device

Info

Publication number
JPS5721116A
JPS5721116A JP9635280A JP9635280A JPS5721116A JP S5721116 A JPS5721116 A JP S5721116A JP 9635280 A JP9635280 A JP 9635280A JP 9635280 A JP9635280 A JP 9635280A JP S5721116 A JPS5721116 A JP S5721116A
Authority
JP
Japan
Prior art keywords
coefficients
digital filter
latch
switching
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
JP9635280A
Other languages
Japanese (ja)
Other versions
JPS6337971B2 (en
Inventor
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 JP9635280A priority Critical patent/JPS5721116A/en
Publication of JPS5721116A publication Critical patent/JPS5721116A/en
Publication of JPS6337971B2 publication Critical patent/JPS6337971B2/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
    • H03H17/04—Recursive filters
    • H03H17/0405—Recursive filters comprising a ROM addressed by the input and output data signals

Abstract

PURPOSE:To eliminate unnaturality of switching, by deciding a switching timing of coefficients of prestored transfer functions based on the output of a digital filter. CONSTITUTION:A digital filter device consists of by adders 1, 2, multipliers, 4, 5, 8, 9, 10, ROM6 storing the coefficients of a transfer function, a coincidence circuit 11, and a latch 16. A ROM6 is addressed by the cut-off frequency data from the latch 16, coefficients a1, a2, b1, b2, (k) are selected and they are applied to the multipliers 4, 5, 8, 9, 10. When a cut-off frequency fc is changed, the latch 16 stores the fc with a read-in signal R from the coincidence detecting circuit 11, the addressing of the ROM is made and the coefficients are changed. Thus, the transient effect is minimized and the unnaturality at switching can be reduced.
JP9635280A 1980-07-15 1980-07-15 Digital filter device Granted JPS5721116A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP9635280A JPS5721116A (en) 1980-07-15 1980-07-15 Digital filter device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP9635280A JPS5721116A (en) 1980-07-15 1980-07-15 Digital filter device

Publications (2)

Publication Number Publication Date
JPS5721116A true JPS5721116A (en) 1982-02-03
JPS6337971B2 JPS6337971B2 (en) 1988-07-27

Family

ID=14162598

Family Applications (1)

Application Number Title Priority Date Filing Date
JP9635280A Granted JPS5721116A (en) 1980-07-15 1980-07-15 Digital filter device

Country Status (1)

Country Link
JP (1) JPS5721116A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH01300712A (en) * 1988-05-30 1989-12-05 Sony Corp Frequency characteristic control circuit
JPH0225987A (en) * 1988-07-15 1990-01-29 Fuji Xerox Co Ltd Picture processing integrated circuit device

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH01300712A (en) * 1988-05-30 1989-12-05 Sony Corp Frequency characteristic control circuit
JPH0225987A (en) * 1988-07-15 1990-01-29 Fuji Xerox Co Ltd Picture processing integrated circuit device

Also Published As

Publication number Publication date
JPS6337971B2 (en) 1988-07-27

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