[PD] sort of off topic... how to write a filter..

[nullpointer]

HI All,

I know that this is off topic in a way... but I am tinkering with writing dsp code
(some externals for pd ..e.t.c.) and I can't really understand how to implement a filter
(such as lowpass e.t.c.) How do you assess the frequencies of a particular signal and therefore attenuate them?
I assume some method of holding and comparing samples in a buffer or something, but then this would delay output?
Anyway, I am no math expert but I would appreciate any help.. I took a look at pds filter code and it seemed to be easier (in amount of code i.e. quite short) than I was thinking and I realise that i probably need to know more about filter math/operation in general..so any pointers e.t.c.

Thanks

Tom

http://www.nullpointer.co.uk
http://www.dividebyzero.org
________________________________________________________
C:\AUTOEXEC.BAT          
C:\REM [Header]
C:\>
C:\>PATH=C:\PERL\BIN;C:\WINDOWS\COMMAND;\C:jdk1.2.2\bin
________________________________________________________

(all suffixes enabled)

  -----Original Message-----
  From: evan sugerman <sugie at cats.ucsc.edu>
  To: pdlist <pd-list at iem.kug.ac.at>
  Date: 18 June 2001 04:29
  Subject: [PD] (DP)


  If a conversation is to continue; 2 things for actual communication:
   
  /Off of this list to allow for clarity.
   
  /Extinguish cryptic language forms.  It doesnt function to communicate an
   idea which is based in minor reality.
   -granted,..language is arbitrary, but I would like to read what you say
   without translating symbols which are in essence english
   anyway.
   
   soon.evan
   
   
  p.s I dont hate! you
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.puredata.info/pipermail/pd-list/attachments/20010618/09963593/attachment.htm>