[LAD] Determining Phase

Duncan Gray duncang at catraeus.com
Sun Jun 26 03:13:50 UTC 2011

 From the long list of answers, I see lots of speculation about Mr. 
Shirkey's question. Some time back he approached me on the work that had 
been done a very long time ago on phase-modulation to achieve panning. 
He never replied to my subsequent information or queries. I suspect that 
this question is really all about the phase of the signal being 
transported through any given audio driver, ALSA, JACK or whatever, so 
the analysis is somewhat germane.

I think that a phase demod analyzer might be his attempt to solve his 
real problem. I speculate that Patrick didn't actually ask his real 

So, perhaps any Haas-effect plugin would satisfy Patrick's needs.

Other than that, I'd make a really cool spectrum analyzer that ran the 
Fourier analysis on two channels, correlated their phases then made a 
+/- line vs. frequency for all to see so that the phase of the 
components of the spectrum could be watched for phase relationships.


On 06/25/2011 09:23 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.
> Cheers
> --
> Patrick Shirkey
> Boost Hardware Ltd
> _______________________________________________
> Linux-audio-dev mailing list
> Linux-audio-dev at lists.linuxaudio.org
> http://lists.linuxaudio.org/listinfo/linux-audio-dev

More information about the Linux-audio-dev mailing list