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From: Don Pearce
Subject: Re: Phase Detection Of Acoustic Frequencies
Date: Sun, 08 Dec 2002 16:13:37 +0000
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On 8 Dec 2002 07:55:45 -0800, TOF71X@Yahoo.com (Dillion) wrote:
>I am needing to detect the phase differences between 2 acoustic
>frequencies having displacements of 1 to several hz, in an overall
>bandwidth of 20hz-10khz. I have been told that a circuit based around
>the NE/SE567 IC might be what I need to use. I was curious if there is
>an off shelf inexpensive phase detector/amplifier that might
>accomplish this task? Something I can just go and purchase and get it
>over with. If not, can the NE/SE567 be used basically by itself, with
>just a power supply and the audio inputs & outputs going to/from the
>proper pins on the IC in a simple circuit board? If not, are there any
>kits out there that would get this done? Sorry for the dumb questions.
>I would appreciate any help I can get regarding this matter. Thank
If your tones are of differing frequencies, then phase difference is a
pretty much meaningless concept. The phase is constantly changing all
the way from 0 to 360 degrees, at a rate of (2pi radians times the
frequency difference) per second.
Can you re-formulate the problem in a way that makes sense for phase
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