On Tuesday 23 October 2007 00:05:13 James Cameron wrote:
>
> > How would you filter out noise?
>
> You can filter out DC offset by measuring the offset you have, and
> subtracting this measurement from your samples.
A better way would be to use a highpass filter.
Use something like:
for (i=0; i<=NUM_SAMPLES; i++) {
hp_last = 0.9999f * hp_last + in[i] - hp_last_in;
hp_last_in = in[i];
out[i] = hp_last;
}
You could optimise that a bit.
Gordon
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