[time-nuts] Generation of pulse train with 1/4 noise
azelio.boriani at screen.it
Fri Feb 15 11:07:01 EST 2013
I have found this:
1/f noise can be created using random noise generators but it can also be
producted using deterministic functions. One such method is a finite
difference equation proposed by I. Procaccia and H. Schuster
On Fri, Feb 15, 2013 at 4:05 PM, Bob Camp <lists at rtty.us> wrote:
> I think a simple table approach sounds like the quick / dirty way to go.
> On Feb 15, 2013, at 9:56 AM, Jim Lux <jimlux at earthlink.net> wrote:
> > On 2/15/13 6:21 AM, Bob Camp wrote:
> >> The timing does relate to multiple valves, so it's not quite as simple
> as a single rate. The time delta's for the other stuff are all pretty
> short, so you may or may not be planing to randomly drive them as well.
> >> It all depends on how fanatic you get about the timing ...
> > Not very..
> > The physical device being driven has one solenoid valve that fills and
> drains the "heart bladder". The radar looks at the gross surface movement
> of the thorax (on the order of 1mm), and we want something that isn't
> perfectly regular and that has some variability (so that the algorithms
> used to detect the heartbeat don't wind up relying on heart rate being zero
> > Rather than just implement something like
> > interval = 60/bpm + 0.1*rand
> > I figured if there was an easy way to generate something from a
> "realistic" distribution, it would be nice.
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