Altera FIR Compiler Manuel d'utilisateur télécharger pdf (Page 28)

3–4 Chapter 3: Parameter Settings

Specifying the Coefficients

FIR Compiler User Guide © May 2011 Altera Corporation

3. After making your settings, click Apply. The dialog box displays the frequency

response of the filter in blue and also displays a list of the actual coefficient values.

(Figure 3–3).

4. To generate floating-point coefficients for interpolation or decimation rate filters,

select Interpolation or Decimation and the required Factor from the Rate

Specification drop-down boxes.

When you click Auto Generate, IP Toolbench generates coefficients for a low-pass

filter with a cutoff frequency based on the specified rate.

Figure 3–4 on page 3–5 shows a decimation filter. The cut-off frequency is ¼ of the

sampling rate and results in a half-band coefficient set.

For an explanation of interpolation and decimation, refer to “Interpolation and

Decimation” on page 4–8.

Figure 3–3. Parallel FIR Filter Coefficient Parameters for Band Pass Filter

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Altera FIR Compiler Manuel d'utilisateur Page 28