MATLAB SIGNAL PROCESSING TOOLBOX 6 Instrukcja Użytkownika Pobierz pdf (Strona 41)

Designing the Filter

4-3

Designing the Filter

This section is a step-by-step introduction to using the Filter Design and Analysis

Tool (FDATool) to design an octave-band filter. An octave is the interval between two

frequencies having a ratio of 2:1. An octave-band filter is a bandpass filter with high

cutoff frequency approximately twice that of the low cutoff frequency. The class of an

octave filter is determined by its allowable passband ripple and its stopband attenuation.

Refer to the ANSI S1.11–2004 standard for more information.

Start FDATool from the MATLAB command line.

fdatool

The FDATool dialog opens with a default filter. Its filter information is summarized

in the upper left (Current Filter Information) and its filter specifications are

depicted in the upper right. In addition to displaying filter specification, this upper

right pane displays filter responses and filter coefficients.

The bottom half of FDATool shows the Filter Design panel, where you specify the

filter parameters. Other panels, such as Import filter from workspace and Pole/Zero

Editor, which you access with the buttons on the lower left, are also displayed in this

area. If you have other products installed, you may see additional buttons.

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MATLAB SIGNAL PROCESSING TOOLBOX 6 Instrukcja Użytkownika Strona 41