VOICE SCRAMBLING USING FILTERING AND MODULATION

[ravi26787]

Hi,


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

 

[ravi26787]

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');