www.gusucode.com > dsp 案例源码程序 matlab代码 > dsp/TwoEqualizersCenteredAtDifferentFrequenciesExample.m
%% Two Equalizers Centered at Different Frequencies % Design two equalizers centered at 100 Hz and 1000 Hz respectively, % both with a gain of 5 dB and a Q-factor of 1.5, for a system running % at 48 kHz. % Copyright 2015 The MathWorks, Inc. Fs = 48e3; N = 6; G = 5; Q = 1.5; Wo1 = 100/(Fs/2); Wo2 = 1000/(Fs/2); % Obtain the bandwidth of the equalizers from the center frequencies and % Q-factors. BW1 = Wo1/Q; BW2 = Wo2/Q; % Design the equalizers and obtain their SOS and SV values. [SOS1,SV1] = iirparameq(N,G,Wo1,BW1); [SOS2,SV2] = iirparameq(N,G,Wo2,BW2); %% % Design biquad filters using the obtained SOS and SV values. BQ1 = dsp.BiquadFilter('SOSMatrix',SOS1,'ScaleValues',SV1); BQ2 = dsp.BiquadFilter('SOSMatrix',SOS2,'ScaleValues',SV2); %% % Plot the magnitude response of both filters using a log % scale. fvtool(BQ1,BQ2,'Fs',Fs,'FrequencyScale','Log'); legend('Equalizer centered at 100 Hz','Equalizer centered at 1000 Hz');