[AH] Red noize

[Magnus Danielson]

From: Martin Czech <martin.czech at intermetall.de>
Subject: Re: [AH] Red noize
Date: Fri, 4 Feb 2000 13:01:32 +0100 (MET)

> Idea : (may be stupid)
> 
> Shift register noise has the advantage to be really white in the interesting
> bandwidth, but it is not really random. How about using a junction avalanche
> (that may not be white noise, depends on current, surface effects i.e. devices
> etc.) to xor some of the shift registers inputs? I guess the shift register
> will scramble (modulate) the avalanche pulses to something white,
> but the sequence will be more random, there may be some correlation in it,
> but it will never be the same, i.e. no cycles.

The trouble with the shift register is that it produces 2**N-1 number of
frequencies (at most). These are single frequencies evenly spread appart.
XORing with noise will not do very well since the modulation would have a DC
term which would let too much of the original waveform thru.

Use more steps instead, then it will be dense enougth.

> 2nd Idea:
> 
> I've read about mathematical theory about poles with rational order,
> or in general network transfer functions with non integer order.
> 
> There is no reason why math should prefer x**2 instead of x**2.18973,
> we do this every day using the pocket calculator.
> Has anything useable grown out of this roots since 1970??

Actuall, there are good reasons for some restrictions of that sort. It is
still a mystery how the Columbs law of fources between two round objects
being electrically charged could be so accurate on r**2. It was simple
reasoning behind that and the conclusion has hold for remearsurements to the
16thies digit without disturbance in the force.

Cheers,
Magnus