Hi GM, Thanks for the suggestion. Yes, it should work for sine tone kind of signals.
I have this doubt on sampling and drift. - Suppose transmitter is sampling a sine tone say (Fin) 1KHz at 8kHZ (Fs) sample rate. This means 8 samples should correspond to one cycle of 1 kHz. - Receiver is sampling at 7.999 kHz because of drift in crystal, but I'm thinking my receiver is having a sample rate of 8kHz and takes 8 samples for one cycle. which gives 999.875 Hz and not 1kHz. So, how to detect this drift and take only that many samples for the corresponding receiver sample rate. in this case 7.999 samples corresponds to 1 kHz. -ben ________________________________ From: music-dsp-boun...@music.columbia.edu <music-dsp-boun...@music.columbia.edu> on behalf of gm <g...@voxangelica.net> Sent: Monday, January 29, 2018 1:29 AM To: music-dsp@music.columbia.edu Subject: Re: [music-dsp] Clock drift and compensation diff gives you the phase step per sample, basically the frequency. However the phase will jump back to zero periodically when the phase exceeds 360° (when it wraps around) in this case diff will get you a wrong result. So you need to "unwrap" the phase or the phase difference, for example: diff = phase_new - phase_old if phase_old > Pi and phase_new < Pi then diff += 2Pi or similar. Am 28.01.2018 um 17:19 schrieb Benny Alexandar: Hi GM, >> HT -> Atan2 -> differenciate -> unwrap Could you please explain how to find the drift using HT, HT -> gives real(I) & imaginary (Q) components of real signal Atan2 -> the phase of an I Q signal diff-> gives what ? unwrap ? -ben ________________________________ From: music-dsp-boun...@music.columbia.edu<mailto:music-dsp-boun...@music.columbia.edu> <music-dsp-boun...@music.columbia.edu><mailto:music-dsp-boun...@music.columbia.edu> on behalf of gm <g...@voxangelica.net><mailto:g...@voxangelica.net> Sent: Saturday, January 27, 2018 5:20 PM To: music-dsp@music.columbia.edu<mailto:music-dsp@music.columbia.edu> Subject: Re: [music-dsp] Clock drift and compensation I don't understand your project at all so not sure if this is helpful, probably not, but you can calculate the drift or instantanous frequency of a sine wave on a per sample basis using a Hilbert transform HT -> Atan2 -> differenciate -> unwrap _______________________________________________ dupswapdrop: music-dsp mailing list music-dsp@music.columbia.edu<mailto:music-dsp@music.columbia.edu> https://lists.columbia.edu/mailman/listinfo/music-dsp
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