Why my spectrogram have negative values?

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Jessie Bessel
Jessie Bessel 2018 年 3 月 10 日
回答済み: Kaiwen Zhao 2020 年 3 月 14 日
In this figure we have a exponential sine wave and his spectrogram. My question is why the spectrogram have negative values? (from -50 to -150)

採用された回答

Star Strider
Star Strider 2018 年 3 月 10 日
Assuming he spectrogram function plots the power spectral density (PSD) in decibels. The values are relative, not negative, amplitudes, so -150 dB corresponds to an amplitude of about 3.2E-8.

その他の回答 (1 件)

Kaiwen Zhao
Kaiwen Zhao 2020 年 3 月 14 日
It's Power/frequency(dB/Hz), using log.

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