Why my spectrogram have negative values?
조회 수: 39 (최근 30일)
이전 댓글 표시
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)
![](https://www.mathworks.com/matlabcentral/answers/uploaded_files/171128/image.png)
댓글 수: 0
채택된 답변
Star Strider
2018년 3월 10일
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.
댓글 수: 0
추가 답변 (1개)
참고 항목
카테고리
Help Center 및 File Exchange에서 Time-Frequency Analysis에 대해 자세히 알아보기
Community Treasure Hunt
Find the treasures in MATLAB Central and discover how the community can help you!
Start Hunting!