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

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6 SPTool: A <strong>Signal</strong> Processing GUI Suite Exporting a Filter to the MATLAB Workspace To export the filter filt1 to the MATLAB workspace: 1 Select filt1 from the Export List and deselect all other items using Ctrl+click. 2 Press the Export to Workspace button. 6-34
Accessing Filter Parameters Accessing Filter Parameters You can access filter parameters in the following two ways. • “Accessing Filter Parameters in a Saved Filter” • “Accessing Parameters in a Saved Spectrum” Accessing Filter Parameters in a Saved Filter The MATLAB structures created by SPTool have several associated fields, many of which are also MATLAB structures. See the MATLAB documentation for general information about MATLAB structures. For example, after exporting a filter filt1 to the MATLAB workspace, type filt1 to display the fields of the MATLAB filter structure. The tf, Fs, and specs fields of the structure contain the information that describes the filter. The tf Field: Accessing Filter Coefficients The tf field is a structure containing the transfer function representation of the filter. Use this field to obtain the filter coefficients; • filt1.tf.num contains the numerator coefficients. • filt1.tf.den contains the denominator coefficients. The vectors contained in these structures represent polynomials in descending powers of z. The numerator and denominator polynomials are used to specify the transfer function Hz () where: Bz () b( 1) + b( 2)z ---------- – 1 + L + bnb ( + 1)z = = ----------------------------------------------------------------------------------------- – m Az () a( 1) + a( 2)z – 1 + L + ana ( + 1)z – n • b is a vector containing the coefficients from the tf.num field. • a is a vector containing the coefficients from the tf.den field. • m is the numerator order. • n is the denominator order. 6-35
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T. P. Traitement du Signal Maîtris
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a=[1 2; 3 4] et le résultat suivan
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y=exp(i*2*pi*t) que l’on rencontr
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t=0:T/N:T-T/N; y=t.^2+5; plot(t,y);
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t f ∫ t0 f ( t) dt t ⎡ N −1 e
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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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) Rampe Montrer que: c) Signal modu
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- Pour le signal c), vérifiez que
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Cette figure montre bien qu’il es
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N correspond aux nombres d’échan
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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(
Page 33: c) Autocorrélation d'un sinus brui
Page 36 and 37: Le schéma de principe qui peut s'a
Page 38: R p =3dB Rs=30dB f P1 =95kHz f P2 =
Page 45 and 46: H ( f ) Etant donné que est pério
Page 47: - Calculer les valeurs de la répon
Page 50 and 51: Exercice1 : comparaison des résult
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T. P. Traitement du Signal MaÃ®trise E.E.A. - LASC

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