I NEED HELP WITH THIS CODE?

Question

Mubasher 2012-5-14

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/38285-i-need-help-with-this-code

Index exceeds matrix dimensions.

Error in ==> wavplay at 56 y = varargin{1};

Error in ==> Untitled at 22 wavplay('Bird') >> clear; clc;

M=2;
freq_sep=100;
nsamp=6;
sampling_frequency=1000;
    id=fopen('bird.wav');
    data=fread(id,inf,'uint8');
    data_bin=de2bi(data);
fsk_mod=fskmod(data_bin,M,freq_sep,nsamp,sampling_frequency);
noise=awgn(fsk_mod,10);
fsk_demod=fskdemod(noise,M,freq_sep,nsamp,sampling_frequency);
[num,rate]=biterr(data_bin,fsk_demod)
z=bi2de(fsk_demod);
a=uint8(z);
wavwrite(a,'Bird');
wavplay('Bird')

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Walter Roberson 2012-5-14

Why are you reading the bird.wav file as binary? .wav files do not encode the sound as plain binary samples: they have a lot of compression, and should be read using wavread()

Mubasher 2012-5-15

i get same error when i use wavread

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Answer 1

Walter Roberson 2012-5-15

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https://ww2.mathworks.cn/matlabcentral/answers/38285-i-need-help-with-this-code#answer_47827

在 MATLAB Online 中打开

http://www.mathworks.com/help/techdoc/ref/wavplay.html

wavplay(y,Fs) plays the audio signal stored in the vector y on a PC-based audio output device. Fs is the integer sample rate in Hz (samples per second). The default value for Fs is 11025 Hz. wavplay supports only 1- or 2-channel (mono or stereo) audio signals. To play in stereo, y must be a two-column matrix.

It does not appear to me that 'Bird' is a audio signal.

To be more explicit: wavplay() does not accept filenames. There is no MATLAB supplied routine for playing sound directly out of .wav files.

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Mubasher 2012-5-16

Does wavplay and sound performs same function? It appears that they do.

Walter Roberson 2012-5-16

No. sound() always waits for the noise to finish. wavplay() has an option to continue one the noise has started. Also, wavplay() can only be used for 32 bit MS Windows systems.

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