[LAD] Determining Phase

Gabriel M. Beddingfield gabrbedd at gmail.com
Sat Jun 25 18:55:05 UTC 2011

On Saturday, June 25, 2011 09:23:29 am 
pshirkey at boosthardware.com wrote:
> Hi,
> Can anyone point me to a simple code example for how to
> determine the phase at a specific time in a waveform?
> ex. if I have a sample that is 5 seconds long and want to
> know the phase at 2.5 seconds
> I'm open to code in any language or a scripted example if
> such a tool exists. If there is an ui which has that
> feature I am also interested.

Do you mean... for a very simple sine wave?

Assuming yes:

  p = asin( x / A )


  A is the amplitude of the sine wave
  x is the value of the sample (-A <= x <= A)
  p is the phase of the wave in radians (-pi/2 <= p <= pi/2)

If not this... then... "what Jörn said!" :-)


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