JPS572116A - Digital filter device - Google Patents
Digital filter deviceInfo
- 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
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.
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)
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)
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 |
-
1980
- 1980-06-05 JP JP7601080A patent/JPS572116A/en active Granted
Cited By (6)
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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