MATLAB: Wavread() floats without clipping

clipfloatwavread

I am doing processing on 32 bit floating point audio that has intermediate results outside the +1 to -1 range. I can save it with wavwrite() at the full dynamic range of a float but wavread() clips it. Is there a way to make wavread() read IEEE 32 bit float wave files with the full dynamic range of the data type?

Thanks

Best Answer

Now, this is strange. After restarting Matlab, wavread() and wavwrite() are now symmetric and handle the full range of float values instead of clipping. It looks like I had some kind of weird modal problem that a restart fixed. Go figure.

Past experience (lots and lots of it) had led me to believe that was the case so I was extremely surprised at the clipping behavior I was seeing.

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x2 = x(1:1000,:);      %stereo

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Try this to normalise the signals before you write them:

t = 0:99;                                   % Time Vector (For Plotting)
V1 = randi([-9 9], 100, 1);                 % Create Out-Of-Range Data
V2 = V1 / max(abs(V1));                     % Normalise To ±1
figure(1)
plot(t, V1,    t, V2)
hold on
plot(xlim, [1 1], '--k')
plot(xlim, [-1 -1], '--k')
hold off
grid
legend('Original', 'Normalised', '±1')

The code simply divides all the data by the maximum of the absolute value (so it is not necessary to test both the positive and negative values). The plot illustrates the input and output of the normalisation.

Experiment to get the result you want.

Best Answer

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