Filters

[Ben Stuyts]

On Sat, 09 Jan 1999, James Jackson wrote:

> Yes, I am designing a Physical Modelling synth. See:
>
> http://www.newd.demon.co.uk/dsp/

Looks interesting. Any idea when you will start implementing it?

> The filters will be based around Fourier Transform algorithms, so I'll have
> to teach myself how to do Fourier Transforms! Yes, they  have the usual
> 'Analog Style' controls, as I want to make my synth as Analog as possible.

If I understand you correctly you want to do an fft on the signal, then in  
the frequency domain do the filtering, and then reverse fft back to the audio  
signal? You'll be having a lot of fun with that. An important problem is that  
you'll have to do this on multiple overlapping windows, using some sort of  
windowing functions. Otherwise, you'll get audible clicks at the points where  
one fft starts and the next one ends. Also important is the choice of the size  
of your fft.

Wouldn't a more conventional filter type (FIR or IIR) be more practical for this?

> James Jackson - New Era Web Designs |

BTW, I looked at http://www.newd.demon.co.uk/ and all I got was "Please Wait,  
determining browser type...". There it ended. (Hint: there's more to life  
than Netscape, Internet Explorer and Javascript.) Not very good advertizing  
for somebody who has Web Designs in his signature. B-)

Best regards,
Ben