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

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THAYANANDA RAMANA
THAYANANDA RAMANA 2023-3-17
回答： Paul 2023-3-17
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?

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Paul
Paul 2023-3-17
Ran in:
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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