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nh2 / hemokit

Haskell library for the Emotiv EEG, inspired by the Emokit code
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Sampling frequency #10

Closed gustavovso closed 8 years ago

gustavovso commented 8 years ago

Hi I run 'hemokit-dump --format spaced' on windows and put the data on a text file, but I don't know if the sampling frequency is 2048Hz or 128Hz. Which frequency is the right one?

mdtdev commented 8 years ago

If hemokit can speed up the Emotiv by a factor of 10, I need to get in on this!

The EPOC uses a 1024 Hz sampling rate internally, and then downsamples the data to 128 Hz to return over the wireless connection. So, with no real knowledge of hemokit, I'd assume that it returns at the usual hardware rate of 128 Hz.

nh2 commented 8 years ago

Yes, 128 Hz, see also https://github.com/nh2/hemokit/blob/b2d78925eca1ed992d9fe43ba50057065c8b8fec/src/Hemokit.hs#L88.

Please reopen if you need more info!