How to write audio without data clipping?

Question

Su Latt Sandi 2018-2-15

1
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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/382784-how-to-write-audio-without-data-clipping

评论： Pham Xuan Trung 2020-7-9

Hello,

I want to write audio without data clipping. I tried by multiplying audio coefficients with float number (e.g. 0.1, 0.5, 0.001, etc.) to get the value within the range of -1 to +1. But this error are still occurred Warning: Data clipped when writing file. In audiowrite>clipInputData In audiowrite . I would be grateful if someone help me in this error.

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Answer 1

Star Strider 2018-2-15

2
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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/382784-how-to-write-audio-without-data-clipping#answer_305249

在 MATLAB Online 中打开

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.