Why my spectrogram have negative values?
Mostrar comentarios más antiguos
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)
Respuesta aceptada
Star Strider
el 10 de Mzo. de 2018
2 votos
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.
Más respuestas (1)
Kaiwen Zhao
el 14 de Mzo. de 2020
1 voto
It's Power/frequency(dB/Hz), using log.
Categorías
Más información sobre Time-Frequency Analysis en Centro de ayuda y File Exchange.
el 10 de Mzo. de 2018
el 14 de Mzo. de 2020
Community Treasure Hunt
Find the treasures in MATLAB Central and discover how the community can help you!
Start Hunting!
Translated by 
