>> Doesn't look like any kind of lowpass or highpass filter response to me.
>> Looks more like it's rearranging the order of the samples or something.
>>
>
> What it appears to be doing is for every 2 samples:
>
> The first of the pair gets the same positive value on its respective
> sample in the first and second half. The second of the pair is then
> added to the sample on the first half, and subtracted from the sample on
> the second half.
>
> Subsample and repeat the desired number of times.

So for every pair of samples, it simply computes the sum and the difference?

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