Signal Processing Toolbox

fvtool

Open the Filter Visualization Tool

Syntax

fvtool(b,a)

fvtool(b₁,a₁,b₂,a₂,...b_n,a_n)

Description

fvtool(b,a) opens the Filter Visualization Tool (FVTool) and computes the magnitude response of the filter defined with numerator, b and denominator, a. Using FVTool you can display the phase response, group delay, impulse response, step response, pole-zero plot, and coefficients of the filter.

fvtool(b₁,a₁,b₂,a₂,...b_n,a_n) opens FVTool and computes the magnitude responses of multiple filters defined with numerators, b₁...b_n and denominators, a₁...a_n.

Note    In fdatool, selecting Full View Analysis from the Analysis menu launches FVTool.

Note    If you have the Filter Design Toolbox installed, you can use fvtool on quantized filter objects by using fvtool(Hq,Hq1).

Examples

Example 1

Display the magnitude response of an elliptic filter.

[b,a]=ellip(6,3,50,300/500);
fvtool(b,a); 

Example 2

Display and analyze multiple FIR filters.

n = 20;                  % Filter order
f = [0 0.4 0.5 1];       % Frequency band edges
a = [1 1 0 0];           % Desired amplitudes 
b  = remez(n,f,a);
b2 = remez(n*2,f,a);     % Double the filter order
fvtool(b,1,b2,1); 

See Also

fdatool, sptool

freqzplot

gauspuls