to change the amplitude of a .wav file

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Femi Okome
Femi Okome 2022-12-14
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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采纳的回答

Image Analyst
Image Analyst 2022-12-14
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
  2 个评论
Femi Okome
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.
Image Analyst
Image Analyst 2022-12-15
You probably need to square the signal to get power then use the formula here:
https://en.wikipedia.org/wiki/Decibel#Power_quantities

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