What are the frequency units for BandpassFilter, etc. ?

Questions
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1

I’m trying to band-pass filter data collected at 20000 Hz. I’m unclear what the frequency units should be for the BandpassFilter function. Are they in Hz? Suppose I want to band-pass filter between 30 Hz and 80 Hz a signal digitized at 20000 Hz. What would the input to BandpassFilter look like? Thank you.

2

The example in this StackExchange posting may help you

[http://mathematica.stackexchange.com/questions/15264/how-do-you-remove-noise-to-detect-just-the-human-voice/15275#15275

(scroll down to the 10th answer or search the page for “BandpassFilter”.)

-](http://mathematica.stackexchange.com/questions/15264/how-do-you-remove-noise-to-detect-just-the-human-voice/15275#15275)-David