to change the amplitude of a .wav file

Question

Femi Okome 2022-12-14

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1878422-to-change-the-amplitude-of-a-wav-file

评论： Image Analyst 2022-12-15

I am new to Matlab and im trying to change the amplitude of a .wav file. i have exported the data and Fs. i just dont know how to now increase/decreas the aplitude of the wav.

the code below shows what i have done,

thanks for any advice given.

plot(data);
soundsc(data,fs);

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Answer 1

Image Analyst 2022-12-14

1
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1878422-to-change-the-amplitude-of-a-wav-file#answer_1128112

在 MATLAB Online 中打开

Try multiplying by a scaling factor:

amplificationFactor = 1.1; % Ten percent gain.
data = data * amplificationFactor;
plot(data);
sound(data, fs);

You might be interested in my File Exchange entry that allows you to plot the waveforms of all the files in a folder:

https://www.mathworks.com/matlabcentral/fileexchange/72431-plot-audio-file-waveforms?s_tid=srchtitle

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Femi Okome 2022-12-14

thank you very much. that now works and i can also see the gain change on the graph. one more thing, what would be the best way to calculate the plot value in dB.