On Sat, 20 Dec 2014 18:31:29 -0500 "Mike Garvey" <[email protected]> wrote:
> From a Time-Nut perspective, isn't phase/frequency of the (nominal) > 60 Hz all we'd be interested in? Phase is best measured at a zero > crossing as this is the (only) phase measurement point which is > independent of amplitude. > Mike One overkill AFSK demod is to sample the signal and compute the arcsin, essentially producing a straight line of phase versus time. We had made a AFSK demod using linear regression on this line to determine frequency. This isn't overkill when you have a DSP chip there anyway. Now I don't see a reason why similar analysis couldn't be done with power line monitoring. Over some moving window of time, you could even produce the difference signal between the sine wave due to the regression fitting from the raw signal and thus display the noise on the line. _______________________________________________ time-nuts mailing list -- [email protected] To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
