JPS5721117A - Digital filter device - Google Patents
Digital filter deviceInfo
- Publication number
- JPS5721117A JPS5721117A JP9635380A JP9635380A JPS5721117A JP S5721117 A JPS5721117 A JP S5721117A JP 9635380 A JP9635380 A JP 9635380A JP 9635380 A JP9635380 A JP 9635380A JP S5721117 A JPS5721117 A JP S5721117A
- Authority
- JP
- Japan
- Prior art keywords
- coefficients
- filter device
- digital filter
- rom6
- multipliers
- 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
Abstract
PURPOSE:To eliminate the unnaturality at switching, by switching the coefficients of a transfer function prestored with a signal in a digital filter device. CONSTITUTION:A digital filter device consists of adders 1, 2, multipliers 4, 5, 8, 9, 10, ROM6 storing the coefficients of the transfer function, a coincidence detecting circuit 11 and a latch 16. The ROM6 is designated for the address with the cut-off frequency data from the latch 16 and applies coefficients a1, a2, b1, b2, (k) to the multipliers 4, 5, 8, 9, 10. In changing the coefficients, a cut-off frequency data is stored in the latch 16 with a read-in control signal R from the coincidence circuit 11, the output makes the address designation of the ROM6 and new coefficients are applied to the multipliers 4, 5, 8, 9, 10. Thus, the transient effect at coefficient switching can be decreased.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP9635380A JPS5721117A (en) | 1980-07-15 | 1980-07-15 | Digital filter device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP9635380A JPS5721117A (en) | 1980-07-15 | 1980-07-15 | Digital filter device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS5721117A true JPS5721117A (en) | 1982-02-03 |
| JPS6337972B2 JPS6337972B2 (en) | 1988-07-27 |
Family
ID=14162625
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP9635380A Granted JPS5721117A (en) | 1980-07-15 | 1980-07-15 | Digital filter device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS5721117A (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS60207170A (en) * | 1984-03-31 | 1985-10-18 | Kyocera Corp | Fixing device |
| JPS6288414A (en) * | 1985-10-11 | 1987-04-22 | インタ−ナショナル ビジネス マシ−ンズ コ−ポレ−ション | Filter for suppressing energy in frequency varied along withthe rogress of time |
| JPS6292600U (en) * | 1985-11-25 | 1987-06-13 | ||
| JPH01300712A (en) * | 1988-05-30 | 1989-12-05 | Sony Corp | Frequency characteristic control circuit |
| US5270954A (en) * | 1990-07-18 | 1993-12-14 | Casio Computer Co., Ltd. | Filter device and electronic musical instrument using the filter device |
-
1980
- 1980-07-15 JP JP9635380A patent/JPS5721117A/en active Granted
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS60207170A (en) * | 1984-03-31 | 1985-10-18 | Kyocera Corp | Fixing device |
| JPH0477917B2 (en) * | 1984-03-31 | 1992-12-09 | Kyocera Corp | |
| JPS6288414A (en) * | 1985-10-11 | 1987-04-22 | インタ−ナショナル ビジネス マシ−ンズ コ−ポレ−ション | Filter for suppressing energy in frequency varied along withthe rogress of time |
| JPS6292600U (en) * | 1985-11-25 | 1987-06-13 | ||
| JPH01300712A (en) * | 1988-05-30 | 1989-12-05 | Sony Corp | Frequency characteristic control circuit |
| US5270954A (en) * | 1990-07-18 | 1993-12-14 | Casio Computer Co., Ltd. | Filter device and electronic musical instrument using the filter device |
| US5450350A (en) * | 1990-07-18 | 1995-09-12 | Casio Computer Co., Ltd. | Filter device and electronic musical instrument using the filter device |
| US5502277A (en) * | 1990-07-18 | 1996-03-26 | Casio Computer Co., Ltd. | Filter device and electronic musical instrument using the filter device |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS6337972B2 (en) | 1988-07-27 |
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