T. P. Traitement du Signal MaÃ®trise E.E.A. - LASC

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6 SPTool: A Signal Processing GUI Suite Redesigning a Filter Using the Magnitude Plot After designing a filter in the Filter Designer, you can redesign it by dragging the specification lines on the magnitude plot. Use the specification lines to change passband ripple, stopband attenuation, and edge frequencies. In the following example, create a Chebyshev filter and modify it by dragging the specification lines: 1 Select Chebyshev Type I IIR from the Algorithm menu. 2 Select highpass from the Type menu. 3 Type 2000 in the Sampling Frequency field. 4 Set the following parameters: - Fp = 800 - Fs = 700 - Rp = 2.5 - Rs = 35 5 Select Minimum Order so the Filter Designer can calculate the lowest filter order that produces the desired characteristics. 6 Press Apply to compute the filter and update the response plot. 7 Position the cursor over the horizontal filter specification line for the stopband. This is the first (leftmost) horizontal specification line you see. The cursor changes to the up/down drag indicator. 8 Drag the line until the Rs (stopband attenuation) field reads 100. Note The Order value in the Measurements region changes because a higher filter order is needed to meet the new specifications. 6-50
Setting Preferences Setting Preferences Use Preferences from the SPTool File menu to customize displays and certain parameters for SPTool and its four component GUIs. The new settings are saved on disk and are used when you restart SPTool from MATLAB. In the Preferences regions, you can: • Select colors and markers for all displays. • Select colors and line styles for displayed signals. • Configure labels, and enable/disable markers, panner, and zoom in the Signal Browser. • Configure display parameters, and enable/disable markers and zoom in the Spectrum Viewer. • Specify FFT length, and enable/disable mouse zoom and grid in the Filter Designer. • Enable/disable use of a default session file. • Export filters for use with the Control System Toolbox. • Enable/disable search for plug-ins at start-up. Note You can set MATLAB preferences that affect the Filter Visualization Tool only from within FVTool by selecting Preferences from the File menu. You can set FVTool-specific preferences using the Analysis Parameters on the Analysis menu. When you first select Preferences, the Preferences dialog box opens with Markers selected by default. 6-51
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T. P. Traitement du Signal Maîtris
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TP 2 : ANALYSE ET SYNTHÈSE DE SIGN
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Relations entre la série de Fourie
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2) Travail demandé 2-1) Analyse d
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TP 4 : UTILISATION DE LA TFD POUR L
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N −1 ∑ x( p)* y( p) = x( m) y(
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Le schéma de principe qui peut s'a
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- Calculer les valeurs de la répon
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T. P. Traitement du Signal MaÃ®trise E.E.A. - LASC

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