ODP: Filters

[Roman Sowa]

This is filtering the hard way IMO, but also very interesting.
Like others already posted it will cause problems between IFFT windows
if you don't overlap them in a good way.
Somehow an analogy to MiniDisc rises - it is afterall some Discrete
Cosine Transforms similar in a way to your proposition,
and it sounds not bad (although I wasn't satisfied with low frequency
sawtooth recordings)
It's a huge topic anyway.
Personally I would go the usual way - IIR or FIR.

According to Magnus Danielson's post, I wouldn't agree with him.
At low frequencies IIR coefficients are dangerously closing 0 or 1
and we deal with resolution problems, where 16 or even 24 bit
for coeficient is not enough and filter becomes unstable.

Roman

> -----Oryginalna wiadomość-----
> Od:	James Jackson [SMTP:james at newd.demon.co.uk]
> Wysłano:	11 stycznia 1999 20:48
> Do:	Roman Sowa
> DW:	synth-diy at mailhost.bpa.nl
> Temat:	Re: ODP: Filters
> 
> >Could you specify what you mean by Fourier Transform based filters?
> 
> Yes, I'll try, but I havn't learnt much about them yet. It would seem
> through feedback from the list, that fourier transforms are not the best
> way
> to do filtering on DSPs, but I'll try to explain anyway. Fourier
> transforms
> allow you to extract the amplitude and other usefull stuff of any given
> frequency when provided with a spectrum of audio (Or more usually, RF)
> data.
> You can use this information to make any type of filter you want.
> 
>