PMEL Acoustics Program logo National Oceanic and Atmospheric Administration Pacific Marine Environmental Laboratory Acoustics Program
 

Spectrograms

 
 
Seismic
Whales
seismic spectrogram whale spectrogram
Man-made
Cryogenic/Ice
man-made noise spectrogram

A convenient means for studying sound is to display recorded signals as "spectrograms" of time versus frequency. In the examples shown here, time increases up the page and frequency increases to the right. Using spectrograms, a trained analyst can determine the nature of the received sound (in most cases).

Links to each type and view-all