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From: "John Jardine"
Subject: Re: Audio Phase meter cct wanted
Date: Tue, 19 Nov 2002 14:32:09 -0000
References: <firstname.lastname@example.org> <email@example.com> <firstname.lastname@example.org>
NNTP-Posting-Date: 19 Nov 2002 14:20:42 GMT
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fred bartoli wrote in message
> John Jardine a écrit dans le message :
> > Tom Bruhns wrote in message
> > news:email@example.com...
> > > "John Jardine" wrote in message
> > news:...
> > > > Tom Bruhns wrote in message
> > > > news:firstname.lastname@example.org...
> > > > > Very simple circuit: digitizer, feeding a processor. In the
> > > > > processor, do a DFT (e.g. Goertzel algorithm) on the frequency
> > > > > interested in. If you run the algorithm on two inputs at the same
> > > > > time, you can easily get the (apparent) phase difference; you can
> > > > > pretty easily account for non-simultaneous sampling if you want.
> > > > > guess pretty much any processor with a hardware multiply could do
> > > > > task for audio frequencies, one freq at a time. If you do an FFT
> > > > > instead of DFT, you can have a whole band of freqs. Depending on
> > > > > accuracy you need and the speed, even a built-in 8-bit ADC could
> > > > > enough, making for very few parts. Lots of options for the
> > > ...
> Also see the recent thread "A Little Goertzel Puzzle" in comp.dsp
> Some small interesting additionnal points for you, I guess.
Thanks Fred. Interesting.
I couldn't resist sticking my twopence worth in, while I was across there!.
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