I tried an experiment this evening with my 6-channel VLF receiver, which
uses a sound-card (sampled at 96KHz or 192KHz) to sample
a VLF loop antenna and amplifier, and then do power detection (and
other things) over six discrete channels, arbitrarily spaced.
The version that I've been using up until now uses a FIR bandpass filter
for each channel, followed by an utterly-uninteresting
power-detector chain.
I didn't know anything about the Goertzel transform until a couple of
days ago, and decided to substitute an equivalent Goertzel
transform for each channel, to see if I could save any CPU by doing
so. The result was that I can save about 15% by going to
the Goertzel transform, instead of an FIR filter with
roughly-equivalent bandwidth.
I'm going to let it run for a couple of days to compare sensitivity.
For equally-spaced channels (which isn't the case here), an FFT might
also be useful and slightly cheaper than a discrete FIR filter
for each channel.
--
Marcus Leech
Principal Investigator
Shirleys Bay Radio Astronomy Consortium
http://www.sbrac.org
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