On 12/02/11 21:02, Bruce Griffiths wrote:
Flicker noise is not the same as random walk noise, the spectra differ.
Using an AC coupled generator (eg a sound card) filters out the low
frequency content.
Zeners and transistors (biased at low current) can be used to generate
flicker noise directly at least for low frequencies where it dominates.
Generating random walk noise is more difficult, integrating white noise
is one technique that can be used (at least in principle).
Of course... *head-slapp*
white noise has a flat power spectrum
flicker noise has a power spectrum of slope f^-1
random walk noise has a power spectrum of slope f^-2
For random walk you need to do integration. If you do it in analogue,
care in low-frequency cut-off comes in and below it you will have white
noise. For digital it's a trivial, but you may end up with digital
wrap-around but doing a low-frequency leakage you avoid it and end up
with the same situation as in the analogue domain.
So expect there to be a frequency limit for it if synthesized.
Cheers,
Magnus
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