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"-LPF" or "-HPF" is added to the file-name when the quality option is set to high or low pass filtered data, i.e. ICLISTENHF1234_20110101T000000Z-HPF.wav. For spectral probability density data products, 'All' may be added to the file-name, as these plots can join LPF, Original and HPF data together into one plot if the spectral frequency bins are the same (data with different frequency content will make addition plots with labels indicating the frequency range). For brevity, 'Original' does not get added to the file-name.

Removing LPF and HPF data from an acoustic data set - applies to pre-August 2016 data only

Downloading HPF (high-pass filtered) data can be avoided by selecting the original data option at the bottom of the data selection page of Oceans 2.0, or by specifying dpo_hydrophoneDataDiversionMode=OD when using the API. However, the LPF (low-pass filtered) data still has to be removed using the steps in the attachment below. If a data set previously downloaded already contains LPF and HPF filtered data, you can follow the same steps to remove the filtered data.

How to remove LPF and HPF data from an acoustic data set.pdf

Acquisition Mode

For hydrophones operating with a duty cycle that includes high and low frequency sample rates. The low sample frequency data will likely have a sample frequency of 16 kHz and the high sample frequency data will likely have a sample frequency greater or equal to then 128 kHz.

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