[sdiy] Digital filtering (Oversampling and downsampling)

[Tom Wiltshire]

On 3 Aug 2009, at 20:23, Ingo Debus wrote:
>
>> As opposed to just taking every 8th sample
>> as-is, I mean. Maybe that's what you meant and I misread it.
>
> No, no, we're not not taking every 8th sample as-is, this would  
> make the whole oversampling thing pointless (why generate all the  
> samples if they are chucked away anyway?). We're taking every 8th  
> sample of the filter's output. The filter's input is still fed with  
> all the samples. In reality, we're only calculating every 8th  
> filter output sample, but all filter input samples are used.

Yes, Ingo has it exactly. Sorry if I didn't make myself clear. This  
stuff is quite new to me.

T.