Random Noise Generator

392

04:43:57

Following the pattern from @hurz, Random number generator, amplify simulator numerical noise.

published 9 years ago

hurz

9 years ago

Pseudo random noise. This is caused by the way how computer approximate the sin wave function. From math point of view sin(a)-sin(a+2pi)=0 but computer can't do that, cuz sin is not available as closed correct function like non periodic others. So gnu mathlib has to do an approximation to sin and this will cause every periode a very tiny numerical difference to the previous one. Keyword is "Taylor" development. Hope this helps.

smorgana

9 years ago

thanks for the explanation. i saw that you were amplifying the difference between sin at 0 and 360 degree phase. ideally there would be no difference, but i guessed they were numerically slightly different.

hurz

9 years ago

Yes, the difference ideal suppose to be zero. Check this i played a little with the error of both numerical results. http://everycircuit.com/circuit/4981154721038336

Redstone_guy

4 years ago

360° = 0°

zorgrian

4 years ago

@R this is quite correct in the sense of rotational rotationalism

andybutler

1 month ago

While the sin calculation will have inaccuracies I'd expect the exact same results if you do the same calculation twice. I suggest that the unpredictable signal we see here is caused by dithering. ?

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