why do my spectrogram values are negative and how to read them?

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I have plotted three spectrogram of audio signal "hello" in FFT and FFT written without using inbuilt fft and HDFT(hopping DFT) and values of spectrogram are in negative values. How to read them and why they are in negative values?

Risposte (1)

Paul
Paul il 17 Mar 2023
The power levels are in dB. Any positive number less than 1 is negative when converted to dB
pow2db(0.5)
ans = -3.0103
See pow2db.

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