Hydrophone Spectrogram Files
A number of hydrophones are producing audio data with sounds at a wide range of frequencies, having applications in seismology, marine mammal studies, ship noise and more. Spectrogram files (.FFT data files or PNG/PDF image files of the spectrogram) are provided as a summary of the audio recording and for detailed analysis. With spectrogram data, users can determine the sources and nature of sounds they can hear in the audio files: passing ships make hyperbolic curves, whales make chirps and resonances, etc.
Hydrophone spectrogram data is available in FFT data files. Spectrogram image files (PDF/PNG), may also be provided at latter date.
Given the sensitive nature of hydrophone data, the military has authority to high-pass filter the data as required. When filtering occurs, the file-name is appended with '-HPF'. Often the unfiltered data will be passed to us at a later date.
For hydrophones located on low-bandwidth observatories (Cambridge Bay, Brentwood Bay, etc), hydrophone audio files may not be available. In this case, any missing audio data is stored on site to be retrieved yearly, while the observatory will upload the spectrogram files as they are much smaller.
Revision History
- 20130912: Hydrophone spectrogram files initially made publicly available (Cambridge Bay hydrophone, FFT files only)
Format
Information on the FFT format will be made available at a future.
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