Archive of the former Yahoo!Groups mailing list: Korg Poly800/EX800 Users

On 4 Jan 2010, at 15:27, Michael Hawkins wrote:

A high frequency sine wave sampled at low frequency will resemble a random number generator.

An infinitely high frequency sine wave sampled at infinitely low frequency would be a true random number generator. Except that since the sample rate is infinitely low, it would take an infinite amount of time to prove it.

;-)

Mike

---

From: gordonjcp <gordon@...>
To: korgpolyex@yahoogroups.com
Sent: Mon, January 4, 2010 9:58:23 AM
Subject: [korgpolyex] Re: Random sample and hold - please explain

--- In korgpolyex@yahoogro ups.com, Electrohead <electrohead2000@ ...> wrote:
>
> So it's sampling from white noise? That's a great idea. Very random. 
> Most synths sample a sine wave for S&H. 

Mmm, none that I've seen do ;-)

What you'd get is a very aliased sinewave depending on the frequency of te sine and the LFO rate. It's a useful if strange effect, good for cyclic patterns. Feeding a squarewave in will give you a variable pulse width pulse output, and a sawtooth wave will give you a "staircase" wave. A mixture of sinewaves (think Hammond organ waves) would give you very complex patterns.

Right, must go and build an outboard S&H now...

Gordon MM0YEQ