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I have written a code please help me in getting the output .

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Mubasher
Mubasher 2012-5-11
When i run this code i got a warninig that data cliped during write to file. Please sugggest something.
clear;
clc;
[data,Fs]=wavread('bird');
predictor = [0 1]; %%y(k)=x(k-1)
M=2;
freq_sep= 100;
nsamp=6;
fs=1000;
snr=0:1:25;
for i=1:1:length(snr)
partition = [-1 1];
codebook = [-1 .50 1];
% Quantize x using DPCM.
encodedx = dpcmenco(data,codebook,partition,predictor); %%modulated signal
fsk_mod=fskmod(encodedx,M,freq_sep,nsamp,fs);
noise=awgn(fsk_mod,snr(i));
fsk_demod=fskdemod(noise,M,freq_sep,nsamp,fs);
decodedx = dpcmdeco(fsk_demod,codebook,predictor);
[num,rate(i)]=biterr(encodedx,fsk_demod);
wavwrite(decodedx,Fs,8,'Bird')
sound('Bird')
end
semilogy(snr,rate)
  1 个评论
Daniel Shub
Daniel Shub 2012-5-11
While unrelated to the warning you are getting, I am pretty sure
sound('Bird')
is not valid MATLAB syntax

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采纳的回答

Daniel Shub
Daniel Shub 2012-5-11
Wow, this question keeps coming up. The WAVWRITE function expects its input (in your case decodedx) to be an array with all values having a magnitude less than 1. You need to scale your decodedx.
See
http://www.mathworks.com/matlabcentral/answers/37866-having-errors-while-converting-mat-file-to-wav-file#answer_47369

更多回答（1 个）

Geoff
Geoff 2012-5-11
Is the output wave supposed to be 8-bit? That's exceptionally grungey... I don't use these wave file functions, but I expect that 'clipped' refers to the signal peaks getting chopped off due to a sampling issue. It could be that your source is 16-bit.
If you type:
class(decodedx)
Does it say uint8?

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