Audio Data
Audio data is primarily produced by hydrophones (underwater microphones). A number of hydrophones are producing audio files with sounds at a wide range of frequencies, having applications in seismology, marine mammal studies, ship noise and more.
Given the sensitive nature of hydrophone data, the military has authority to filter out sensitive frequencies or divert the data entirely, as required. When filtering occurs, the file-name is appended with 'LPF' or 'HPF' for high-pass or low-pass filtering. Often, the military diverted data will be returned at a later date, some of it is filtered however, see here for more information on the diversion of hydrophone and seismometer data.
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
- 20100217: Hydrophone files initially made publicly available
Format
Hydrophone data is available in WAV audio files.
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