Power Spectrum with frequency as x-axis and db level as y-axis

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Mengjia Lyu
Mengjia Lyu 2021-1-6
回答： Mathieu NOE 2021-1-7
Dear all,
I currently have the plot below for a wav file. How can I create a plot with frequency as x-axis and db level as y-axis?

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回答（1 个）

Mathieu NOE
Mathieu NOE 2021-1-7
hello
from what I see , the x axis units is already in Hz
to convert to dB scale , use this :
y_dB = 20*log10(abs(y_fft))
%see example attached

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