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Hi, Karl,

To be honest, I did not try a Lissajous pattern because, to me, the 
phase "strip chart" in StereoTool (stereotool.com) is far more telling.

There are sections in the live program that seem to make sense. I then 
rely on my ears and mono mixing to hear what's up.

Sometimes you can maximize the highs in one channel as well.

It's just that the strip chart (and I assume other phase-comparison 
techniques) will mislead you with the spaced mics.

In a way, this thread is a follow-on to my ARSC presentation in Bloomington.

Cheers,

Richard




On 12/3/2016 17:30, Karl E. Fitzke wrote:
> Richard,
>
>
> Great point to bring up!  You are talking about being mislead by a lissajous pattern (phase scope) or phase torch under these circumstances, right?
>
>
> Instead the best we can do is to fall back solely on our ears and live spectrogram, trying to establish maximum high frequency response, yes?
>
>
> -Karl
>
>
>
> Karl Fitzke
> Audio/Visual Specialist
> 214 Olin Library
> Ithaca, NY 14853
>
> 607-255-5521
> [log in to unmask]
> ________________________________
> From: Association for Recorded Sound Discussion List <[log in to unmask]> on behalf of Richard L. Hess <[log in to unmask]>
> Sent: Saturday, December 3, 2016 2:44:16 PM
> To: [log in to unmask]
> Subject: [ARSCLIST] Setting azimuth from program - a caution
>
> I have been digitizing a batch of tapes for a university music program's
> archives. Most were made in a the several campus performance spaces, and
> from the sound of it and experience, the preponderance of these
> recordings were made with spaced hanging cardioid microphones. While
> stereo mics were also widely used, these sound like spaced mics.
>
> Anyway...none of the tapes had tones and from time to time there is a
> tape with an offset solo instrument. Remembering that we're looking for
> fractions of a degree accuracy in adjusting azimuth playback, when we
> see two separated mics, all bets are off.
>
> With the speed of sound being about 1100 feet per second, we can see how
> moving a mic less than a foot is the length of a complete cycle at 1 kHz.
>
> So, this type of recording is almost impossible to accurately adjust.
> While full ensembles work well with the stripchart in StereoTool, a solo
> instrument or voice can show a huge azimuth error which is really an
> artifact of microphone placement relative to the source.
>
> Cheers,
>
> Richard
>
>
> --
> Richard L. Hess                   email: [log in to unmask]
> Aurora, Ontario, Canada                             647 479 2800
> http://www.richardhess.com/tape/contact.htm
> Quality tape transfers -- even from hard-to-play tapes.
>
-- 
Richard L. Hess                   email: [log in to unmask]
Aurora, Ontario, Canada                             647 479 2800
http://www.richardhess.com/tape/contact.htm
Quality tape transfers -- even from hard-to-play tapes.