JPS5721116A - Digital filter device - Google Patents
Digital filter deviceInfo
- 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
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)
- Complex Calculations (AREA)
- Electrophonic Musical Instruments (AREA)
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.
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)
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 |
-
1980
- 1980-07-15 JP JP9635280A patent/JPS5721116A/en active Granted
Cited By (2)
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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