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參數(shù)資料
| 型號： | FIR Filters |
| 廠商： | Altera Corporation |
| 英文描述： | FIR Compiler(有限的脈沖響應(yīng)濾波器) |
| 中文描述： | 飛行編譯器（有限的脈沖響應(yīng)濾波器） |
| 文件頁數(shù)： | 4/19頁 |
| 文件大?。?/td> | 323K |
| 代理商： | FIR FILTERS |
4
Altera Corporation
FS 1: FIR Filters
Design Flow
Overview
The 8-tap parallel FIR filter design flow in
Figure 2
is common to all
FIR filter reference designs supplied with the Altera DSP Design Kit.
The designer can specify the filter requirements using any
commercially available FIR filter design software that can store the
coefficients in an ASCII file. This file should contain the filter
coefficients one-per-line and should have the extension
The listing below shows the coefficients for an 8-tap lowpass filter in
the
lp8.dat
file, available from the Altera DSP Design Kit:
.dat
.
-5.144663E-03
-2.279553E-02
9.638777E-02
.4296515
.4296515
9.638777E-02
-2.279553E-02
-5.144663E-03
Next, the designer runs FIRGEN to read the coefficients from the
data file. Then, FIRGEN calculates the vector table for the LUT and
creates
coef.inc
.
Using MAX+PLUS II, the designer can compile the AHDL Include
File and set the parameters for the particular filter. To insure the
smallest size and maximum performance, set the
Synthesis Style
to
Fast
in the
Global Project Logic Synthesis
box. This option uses carry chains for high-speed operation.
Global Project
dialog
FIRGEN also generates a swept sine wave (or chirp signal) Vector
File, called
sweep.vec
. This file can be used as a simulation source
file for the MAX+PLUS II Simulator to generate the filter’s frequency
response. The response is then viewed with any plotting program,
such as Microsoft Excel or Gnuplot, a freely distributed program
included with the Altera DSP Design Kit.
1
For a sample design, see the
the
readme
file on the Altera DSP Design Kit CD-ROM.
FIR Filter Design Walkthrough
in
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