VOICE SCRAMBLING USING FILTERING AND MODULATION

Hi,


Is there anyone who can help me by guiding the MATLAB source code for the "VOICE SCRAMBLING USING FILTERING AND MODULATION".
Thank u..

Re: VOICE SCRAMBLING in matlab USING FILTERING AND MODULATI

fs=8000;

inp_samples = wavread('speech_sample_8bits.wav');
N_samples = length(inp_samples);
%filter_coefficients
H = [-0.180866787852 0.1627384090595 0.02414460149792 -0.03956189153684 0.6444243068351 0.6444243068351 -0.03956189153684 0.02414460149792 0.1627384090595 -0.180866787852];
N=length(H);
X = zeros(1,N);
M = zeros(1,N);
%H = zeros(1,N);
%H(1:N)= filter_coefs(1:N);

t=01/fs):1;
sin_sample = sin(2*pi*3300*t);%sine_wave samples 3.3khz
m = 1;

for i=1:N_samples

X(2:N) = X(1:N-1);
X(1) = inp_samples(i);
y(i) = X * H';%filter output(lowpass 3khz)

op_mul(i)= y(i) * sin_sample(m);%multiplier_output

m=m+1;
if (m==8002)
m = 1;
end

M(2:N) = M(1:N-1);
M(1) = op_mul(i);
op_sample(i) = M * H';%filter output(lowpass 3khz)


end
inp_samples = wavread('speech_sample_8bits.wav');

a=wavread('speech_sample_8bits.wav');
plot(a);
wavwrite(op_sample,'scarmbler_output.wav');