Measurement of Phase difference of audio - learning how to set the reference

I'm trying to measure the difference in phase between two audio inputs. (Left and right channel of my sound card)

Both are free running 1 kHz audio samples that come in and out of phase.

When the samples are in phase, everything seems to work fine and shows no phase difference.

However once that signals start to emerge from the +-10deg phase the result keeps jumping around.

It seems to be the fact that it is changing the reference to determine the phase.

When I view the phase of the output of a channel is a sawtooth waveform, from 250deg and then wraps round to-110deg

What I want, it's an entry set to 0 degrees and see the other inputs of difference of phase against it.

Is there a way to give a signal as being the reference or another strategy?

Thanks in advance for any help.

PLEASE NOTE THAT THE acquire.jpg IS ACTUALLY THE VI.

It wouldn't download like the vi. Please rename extension to acquire.vi to see.

Finally managed to find the problem.

Red rooster, I tried to replace your entries simulated with audio inputs card his real world and things turned out horribly.

It doesn't seem to be a translation between the two. (Perhaps because of my understanding of Labview garbage)

LabVIEW uses the internal reference of the DAQ cards in order to make phase measures.

That's what all use the phase VI of measure and which lack of cards not NI - DAQ.

That's what I thought that missed me first place but there's no way I can see simulations your own.

To work around the problem, I used zero crossing detectors in order to compare the time ahead or lagging behind the benchmark for the calculation of phase.

I got the core of the detector from somewhere on the forum but have lost the actual page. (my apologies to the author who deserves the credit)

Anyway, hope this hepls someone.

Tags: NI Software

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