?? make_mel_filters.m
字號:
function mel_fr = make_mel_filters(bandwidth);% make mel-filter bank% mel_fr = frequency response%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% % specs sampling_rate = 2*bandwidth; lfft = 1024; lfft2= lfft/2; lfft2p1= lfft2+1; resp_lgh = 200; % response length resp_lgh2 = resp_lgh/2; % Mel filterbank Fs = sampling_rate; fft_len = lfft; [FB,DCT] = init_filtbank(Fs,fft_len); size_FB = size(FB) nfilters = size_FB(1); mel_fr = FB; figure(1); subplot(311); scale0 = sum(FB(1,(1:lfft2p1))); scalen = max(FB(1,(1:lfft2p1))/scale0); plot(bandwidth*(1:lfft2p1)/lfft2p1,FB(1,(1:lfft2p1))/scale0/scalen); hold; for (k = 2:nfilters) %plot(FB(k,(1:lfft2p1))); scalex = sum(FB(k,(1:lfft2p1))); plot(bandwidth*(1:lfft2p1)/lfft2p1,(FB(k,(1:lfft2p1)))/scalex/scalen); end; hold; axis([0 bandwidth 0 1.25]); xlabel ('Frequency (Hz)'); ylabel ('Amplitude'); grid; %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%?? 快捷鍵說明
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