[time-nuts] Generation of pulse train with 1/4 noise

2013-02-15 Thread Jim Lux
I need to generate a sequence of pulses at around 1 Hz with a 1/f characteristic (human heartbeat, as it happens). I'd like to do this using software and a timer, so I'm looking for a clever algorithm using a random number generator to do it. I could take the phase noise spectrum and turn

Re: [time-nuts] Generation of pulse train with 1/4 noise

2013-02-15 Thread Bob Camp
Hi How much horsepower do you have on the gizmo that's doing the generation? For instance, is this coming out of an MSP-430 or a Core I-7? Bob On Feb 15, 2013, at 7:43 AM, Jim Lux jim...@earthlink.net wrote: I need to generate a sequence of pulses at around 1 Hz with a 1/f characteristic

Re: [time-nuts] Generation of pulse train with 1/4 noise

2013-02-15 Thread Jim Lux
On 2/15/13 4:52 AM, Bob Camp wrote: Hi How much horsepower do you have on the gizmo that's doing the generation? For instance, is this coming out of an MSP-430 or a Core I-7? Bob The mighty ArduinoUno... But it only has to generate one number every second: i.e. I'm simulating human

Re: [time-nuts] Generation of pulse train with 1/4 noise

2013-02-15 Thread Bob Camp
Hi Ok, how about a nice simple table? Something in the 500 to 4K entries shouldn't repeat often enough to be noticeable. Each entry probably can be a byte. Bob On Feb 15, 2013, at 8:09 AM, Jim Lux jim...@earthlink.net wrote: On 2/15/13 4:52 AM, Bob Camp wrote: Hi How much

Re: [time-nuts] Generation of pulse train with 1/4 noise

2013-02-15 Thread Jim Lux
On 2/15/13 5:37 AM, Bob Camp wrote: Hi Ok, how about a nice simple table? Something in the 500 to 4K entries shouldn't repeat often enough to be noticeable. Each entry probably can be a byte. Bob Yes.. that might work.. Or, for that matter, I believe you could do it by randomly

Re: [time-nuts] Generation of pulse train with 1/4 noise

2013-02-15 Thread Bob Camp
Hi I was going to suggest picking start and stop points in the table with your random number generator, but it's pretty much the same thing. If the base rate is 60 bpm, then each spacing is 16.666… ms. My *guess* would be that anything past 0.1 ms likely doesn't matter for the base rate. If

Re: [time-nuts] Generation of pulse train with 1/4 noise

2013-02-15 Thread Jim Lux
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

Re: [time-nuts] Generation of pulse train with 1/4 noise

2013-02-15 Thread Bob Camp
Hi I think a simple table approach sounds like the quick / dirty way to go. Bob On Feb 15, 2013, at 9:56 AM, Jim Lux jim...@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

Re: [time-nuts] Generation of pulse train with 1/4 noise

2013-02-15 Thread Brooke Clarke
Hi Jim: Music synthesizers now use sounds recorded from real instruments and play them back. Why not record a real heart beat, maybe different ones from children, men, women, etc.? Have Fun, Brooke Clarke http://www.PRC68.com http://www.end2partygovernment.com/2012Issues.html Jim Lux

Re: [time-nuts] Generation of pulse train with 1/4 noise

2013-02-15 Thread Azelio Boriani
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 at http://paulbourke.net/fractals/noise/ On Fri, Feb 15, 2013 at

[time-nuts] source for new Resolution T

2013-02-15 Thread Paul
I'd like to buy a new Resolution T and I'm not having a great deal of success getting a retail (quantity one) vendor from Trimble. Anyone have a typical on-line source (e.g. Diamond Point) in the US? -- Paul ___ time-nuts mailing list --

Re: [time-nuts] Generation of pulse train with 1/4 noise

2013-02-15 Thread Magnus Danielson
Jim, On 02/15/2013 03:56 PM, Jim Lux 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.