www.gusucode.com > dsp 案例源码程序 matlab代码 > dsp/FreqRespOfQuasilinearPhaseIIRHalfbandInterpolatorExample.m

    %% Frequency response of Quasi-linear Phase IIR Halfband Interpolator
% Create a minimum order lowpass IIR half-band interpolation filter for 
% data sampled at 44.1 kHz. The filter has a transition width of 4.1 kHz, 
% and a stopband attenuation of 80 dB.
IIRHalfbandInterp = dsp.IIRHalfbandInterpolator(...
                        'DesignMethod', 'Quasi-linear phase');
%%
% Obtain filter coefficients
c = coeffs(IIRHalfbandInterp);

%%
% Plot the Magnitude and Phase response
fvtool(IIRHalfbandInterp,'Analysis','freq')