ex6m2.readme

This is transfer function for matlab.

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% useful matlab files for solution: 

	filter.m
	conv.m
	cceps.m (or use your own from the homework)

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% Here's how the synthetic speech waveform was created 

				% vocal tract response: v[n]

				% poles
p1 = m1*exp(j*p1);
p2 = m1*exp(-j*p1);

p3 = m2*exp(j*p2);
p4 = m2*exp(-j*p2);

				% zeros
z1 = m3*exp(j*p3);
z2 = m3*exp(-j*p3);

K = 1;

P = [p1, p2, p3, p4]';
Z = [z1, z2]';

[B,A] = zp2tf(Z,P,K);


impulse = zeros(1, 100);
impulse(1) = 1.0;
v = filter(B,A,impulse);
t = [v(3:length(v)), 0, 0];
v = t;

				% glottal pulse: g[n] 
				% two poles outside unit circle
eq = alpha.^(0:99);
g = conv(eq, eq);
g = g(length(g):-1:1);
g = g(180:199);


				% h[n] = g[n]*v[n]
h = conv(g, v);

clf;
subplot(311)
plot([g, zeros(1,100)])
title('GLOTTAL PULSE: g[n]')
subplot(312)
plot([v, zeros(1,100)])
title('VOCAL TRACT RESPONSE: v[n]')
subplot(313)
plot([h, zeros(1,100)])
title('h[n] = g[n]*v[n]')
pause;



				% speech waveform 


				% impulse train: p[n]
p = zeros(1, 1000);
beta = 0.70;
p(1) = 1.0;
p(201) = beta^1;
p(401) = beta^2;
p(601) = beta^3;
p(801) = beta^4;

				% glottal pulse train: x[n]
x = conv(p, g);

				% speech: y[n] = x[n]*v[n]
y = filter(B,A,x);

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