Signalbehandling Formelsamling
Signalbehandling Formelsamling
Signalbehandling Formelsamling
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Blockschema över D/A omvandlingIdeal rekonstruktionx(n)TLågpassy a (t)-Fs/2Fs/2x(n)Σ δ( t-n T)nx(1) Ty a (t)| X(f)|n t tF|X( ) T |Fs|Y (F)|af F F-.5 .5 -Fs/2 Fs/2 -Fs/2 Fs/2Rekonstruktion med sample-and-hold∞∑y a (t) = x(n) sin π (t − nT )Tπn=−∞(t − nT )TY a (F ) = 1 ( ) FX |F |≤ F sF s F s 2x(n)h SH(t)Lågpassy a(t)1T-Fs/2Fs/2x(n)Σ δ( t-n T)ny a(t)n t tF| X(f)||X( ) H (F)||Y (F)|Fs SHaf F F-.5 .5 -Fs/2 Fs/2 -Fs/2 Fs/2Y a (F ) = 1 ( ) FXF s F s· sin(πFT)πFTe −j2πF T 2 · HLP (F )17