[sdiy] converting white noise to pink noise

[Tom Wiltshire]

On 5 Mar 2008, at 14:41, Scott Gravenhorst wrote:
>
> I will add that sometimes the bit labeling is a bit weird.  I'm  
> very much used to a
> zero based numbering system for anything with "N bits" where N > 0,  
> but some LFSR bit
> taps I've seen, including the Xilinx link I posted, use a 1 based  
> system.  From this
> confusion an error can easily arise.


Yes, I've been caught out like this too. Finished up writing a LFSR  
that wasn't anywhere near as good as it was supposed to be. It was  
only when I really went back over it and checked everything that I  
spotted the numbering difference and the error.
Being a longtime computer programmer, I obviously count "0, 1, 2, 3"  
rather than "1, 2, 3" but for some reason LFSR taps seem to mostly  
start with bit 1. Weird. Maybe they were designed by normal people or  
something.

T.