MATLAB SIGNAL PROCESSING TOOLBOX 6 Manual do Utilizador descarregar pdf (Página 42)

4 Filter Design with the FDATool GUI

4-4

Note that when you open FDATool, Design Filter is not enabled. You must make

a change to the default filter design in order to enable Design Filter. This is true

each time you want to change the filter design. Changes to radio button items or

drop down menu items such as those under Response Type or Filter Order enable

Design Filter immediately. Changes to specifications in text boxes such as Fs,

Fpass, and Fstop require you to click outside the text box to enable Design Filter.

In the Response Type pane, select Bandpass.

In the Design Method pane, select IIR, and then select Butterworth from the

selection list.

For the Filter Order, select Specify order, and then enter 6.

Set the Frequency Specifications as follows:

Parameter Setting Description

Units Hz Units for the parameters

Fs 48000 Sampling frequency

Fc1 22 First cutoff frequency (i.e., the frequency

preceding the passband at which the

magnitude response is 3 dB below the

passband gain)

1 2 ... 37 38 39 40 41 42 43 44 45 46 47 ... 59 60

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MATLAB SIGNAL PROCESSING TOOLBOX 6 Manual do Utilizador Página 42