On 9/15/2010 9:56 AM, Invisible wrote:
>>> 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?

Recursively, yes...

-- 
~Mike

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