Please, I have a recorded audio signal from experimental work. I have been able to plot the time domain graph (see attached) using Matlab software. By default, the y-axis values are present in a linear scale (Amplitude). I would like to plot the time domain graph such that the y-axis scale is is in decibel. I understand that using 20*log10(signal) should provide the decibel scale on the y-axis, however, this does not seem to work after several attempts.
Please, I would be glad if someone can assist me (specifically with a code). I might not be doing something right. Thank you.
Anders Buen
you need a reference which for sound pressure kevels are 20 microPascal. Do you have recorded a reference signal? 94dB or 114dB is usual, dependant on the unit used.
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