audiowrite audio file create

2015 11 26
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更新时间：2015 11 26
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I should create an audio file with audiowrite, to save the same sound I can hear with sound function. How should I set function parameters?
% code
load flux_adaptive_100
filename = 'flux_adaptive_100.wav';
audiowrite (filename,y,Fs);
clear y Fs
end

10 个评论
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Image Analyst
Image Analyst 2015-11-26
What parameters? You already have y and Fs when you played the sound in the sound function, and you're specifying the filename, so what additional parameters do you think you need for audiowrite()?
Marco Cornero
Marco Cornero 2015-11-26
sorry, i mean variables: in particular y and Fs. I tried to use the same Fs of sound function. My input matrix is 200000x1 double. I want to obtain a 2 seconds file. Thanks
Geoff Hayes
Geoff Hayes 2015-11-26
编辑：Geoff Hayes 2015-11-26
According to audiowrite, you are passing the correct parameters into the function call.
You mention a two second file...is that the first two seconds, or last two, or is your audio data just two seconds in length?
If you want the first two seconds, then you would do something like
audiowrite (filename,y(1:2*Fs),Fs);
assuming Fs is the number of samples per second and 2*Fs is less than 200000.
Marco Cornero
Marco Cornero 2015-11-26
I sampled a signal with a 1e-5 sample rate, which gave me the matrix I described before. If I choose Fs=100000 shouldn't be the file length = 2 seconds?
Marco Cornero
Marco Cornero 2015-11-26
Using simple words: i want to save the sound i can hear using
sound(flux_adaptive_100,100000)
which is a 2 seconds length audio.
Geoff Hayes
Geoff Hayes 2015-11-26
If Fs is 100000 and your y is of length 200000, then it is two seconds in length. So
audiowrite (filename,y,Fs);
is correct. Or are you saying that this doesn't work?
Marco Cornero
Marco Cornero 2015-11-26
I'm saying that this doesn't work: now the length of the file is correct but there isn't any sound, while using
sound(flux_adaptive_100,100000)
the sound is hearable
Geoff Hayes
Geoff Hayes 2015-11-26
Okay. What are the units of y? You mention how y is an array of doubles, so what is the minimum and what is the maximum? What happens when you read the flux_adaptive_100.wav back into MATLAB? Can you hear any audio once you start playing it? If not, then check the samples and compare to those that you saved to file (what is the minimum and what is the maximum?).
Marco Cornero
Marco Cornero 2015-11-26
if I open in matlab flux_adaptive_100.wav I obtain a column with constant value = 1
Marco Cornero
Marco Cornero 2015-11-26
I found the solution!!! I had to write y=flux_adaptive_100(:,1)

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