JPS647809A - Digital filter - Google Patents
Digital filterInfo
- Publication number
- JPS647809A JPS647809A JP16337387A JP16337387A JPS647809A JP S647809 A JPS647809 A JP S647809A JP 16337387 A JP16337387 A JP 16337387A JP 16337387 A JP16337387 A JP 16337387A JP S647809 A JPS647809 A JP S647809A
- Authority
- JP
- Japan
- Prior art keywords
- tap
- prom
- input signal
- multiplication
- result
- 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.)
- Pending
Links
Landscapes
- Cable Transmission Systems, Equalization Of Radio And Reduction Of Echo (AREA)
- Filters That Use Time-Delay Elements (AREA)
Abstract
PURPOSE:To eliminate the need of a multiplier, and also, to reduce the power consumption by storing in advance a result of multiplication of an input signal and a tap coefficient in a PROM, and executing a calculation of a digital filter by using its value. CONSTITUTION:The address of a PROM 6 is determined by an input signal outputted from a RAM 4 and a tap number. In the PROM 6, on the address determined by the tap number corresponding to some tap coefficient and the input signal, a result of multiplication of its tap coefficient and the input signal is stored. When the address corresponding to the tap number in a delay element string is added, the RAM 4 generates a tap output which has an input sampling signal delayed in accordance with the tap number. The PROM 6 outputs a result of multiplication of the input signal and the tap coefficient by adding the output of the RAM 4 and the tap number as the address. An adder 3 obtains a desired digital filter output by cumulating the output of the result of multiplication of the PROM 6. In such a way, a multiplier is made unnecessary.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP16337387A JPS647809A (en) | 1987-06-30 | 1987-06-30 | Digital filter |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP16337387A JPS647809A (en) | 1987-06-30 | 1987-06-30 | Digital filter |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS647809A true JPS647809A (en) | 1989-01-11 |
Family
ID=15772647
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP16337387A Pending JPS647809A (en) | 1987-06-30 | 1987-06-30 | Digital filter |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS647809A (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH0438005A (en) * | 1990-06-04 | 1992-02-07 | Nec Corp | Digital signal processing circuit |
JPH0556206U (en) * | 1991-12-26 | 1993-07-27 | 朝日マリンファミリー株式会社 | Filtration tank |
-
1987
- 1987-06-30 JP JP16337387A patent/JPS647809A/en active Pending
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH0438005A (en) * | 1990-06-04 | 1992-02-07 | Nec Corp | Digital signal processing circuit |
JPH0556206U (en) * | 1991-12-26 | 1993-07-27 | 朝日マリンファミリー株式会社 | Filtration tank |
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