MATLAB SIGNAL PROCESSING TOOLBOX 6 Manuel d'utilisateur télécharger pdf (Page 31)

Design a Filter Using fdesign

3-3

Design a Filter Using fdesign

Use the following two steps to design a simple filter.

Create a filter specification object.

Design your filter.

Design a Filter in Two Steps

Assume that you want to design a bandpass filter. Typically a bandpass filter is defined

as shown in the following figure.

In this example, a sampling frequency of Fs = 48 kHz is used. This bandpass filter has

the following specifications, specified here using MATLAB code:

A_stop1 = 60; % Attenuation in the first stopband = 60 dB

F_stop1 = 8400; % Edge of the stopband = 8400 Hz

F_pass1 = 10800; % Edge of the passband = 10800 Hz

F_pass2 = 15600; % Closing edge of the passband = 15600 Hz

F_stop2 = 18000; % Edge of the second stopband = 18000 Hz

A_stop2 = 60; % Attenuation in the second stopband = 60 dB

A_pass = 1; % Amount of ripple allowed in the passband = 1 dB

In the following two steps, these specifications are passed to the fdesign.bandpass

method as parameters.

Step 1

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MATLAB SIGNAL PROCESSING TOOLBOX 6 Manuel d'utilisateur Page 31