20111eeM214A_1_ps311-sol

# 20111eeM214A_1_ps311-sol - xlabel(’Frames’...

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UCLA Dept. of Electrical Engineering EE M214A, Winter 2011 Problem Set 3 Solution February 7, 2011 1. Answer: 1

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2. 6.9 Answer: 4
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3. 6.17 Answer: window size: 20 ms, window shift: 10 ms, window type: Hamming. [raw, fs] = wavread(wavfile); step = 0.01 * fs; m = 0.02 * fs; n = length(raw); framenum = floor((n - m)/step) + 1; hw = hamming(m); eng = zeros(1, framenum); mag = zeros(1, framenum); zcr = zeros(1, framenum); for i = 1:framenum istart = (i-1)*step+1; x = raw(istart: istart+m-1); hx = x.*hw; eng(i) = hx’*hx; mag(i) = sum(abs(hx)); for j=1:m-1 zcr(i) = zcr(i) + 1; % save index of zero-crossing end end zcr(i) = zcr(i) / m; end xl = 1:n; xs = 1:framenum; subplot(4,1,1); title(’s5male.wav’); hold on; plot(xl, raw, ’k’); xlabel(’Samples’); ylabel(’Amplitude’); axis tight; subplot(4,1,2); plot(xs, eng, ’b’, ’LineWidth’, 2);

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Unformatted text preview: xlabel(’Frames’); ylabel(’Engergy’); axis tight; subplot(4,1,3); plot(xs, mag, ’r’, ’LineWidth’, 2); xlabel(’Frames’); ylabel(’Magnitude’); 8 axis tight; subplot(4,1,4); plot(xs, zcr, ’m’, ’LineWidth’, 2); xlabel(’Frames’); ylabel(’Zero crossing rate’); axis tight; 0.2 0.4 0.6 0.8 1 1.2 1.4 1.6 1.8 2 2.2 2.4 x 10 4-0.5 0.5 s5male.wav Samples Amplitude 50 100 150 200 250 5 10 Frames Engergy 50 100 150 200 250 10 20 Frames Magnitude 50 100 150 200 250 0.2 0.4 0.6 Frames Zero crossing rate 4. 7.5 Answer: 9 5. 7.6 Answer: 6. 7.12 Answer: 10 7. 8 Answer: 64-point window is better for formant detection, for it is wide band anaysis. 400-point window is better for pitch detection, for it is narrow band anaysis. 11...
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20111eeM214A_1_ps311-sol - xlabel(’Frames’...

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