Martin,

Russell's pun refers to a type of computation known as the FFT butterfly:
http://www.skylondaworks.com/sc_admpy.htm

Regards

Mike

>-----Original Message-----
>From: piclist-bounces@mit.edu [mailto:piclist-bounces@mit.edu] 
>Sent: 05 June 2006 01:46
>To: Microcontroller discussion list - Public.
>Subject: Re: [PIC]: Audio spectrum analyzer
>
>
>The days of simple motorola MCUs or the discrete FFT?
>Have you looked at the HCS12? My my.. I'd need a week to get 
>going with it. The MSP430s seem pretty nice. I'd like to find 
>a decent eval board for one.
>--
>Martin K
>
>Russell McMahon wrote:
>
>>>The math for a discrete FFT isn't too complicated, especially at low 
>>>resolutions. Try doing a little reading about it - it's fascinating 
>>>stuff.
>>>    
>>>
>>
>>We did it on an MC6800 long long ago.
>>
>>The memory gives me Butterflies :-)
>>
>>
>>
>>
>>        RM
>>
>>  
>>
>-- 
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