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easy to access phase switch

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blgentry:

--- Quote from: mojave on May 12, 2017, 03:25:50 pm ---JRiver's DSP has a polarity button, but it doesn't change phase. If you want to change the phase, you need to use the delay.

--- End quote ---

Are you speaking academically, or about an implementation detail or ...? 

Most audiophiles that are concerned with this are concerned about polarity:  What direction the microphone transducer moved when the high pressure wave front from the incident sound got to the transducer.

This is, for most purposes, the same thing as a 180 degree phase shift at all frequencies.  I.E., you flip the waveform upside down.

Now if you are saying it's not a phase shift because it's not 180 degrees at a specific frequency, and therefor a specific time delay in miliseconds, I guess I follow that.  But I'm not sure it's relevant to the OP's desires.

For the record I sort of blow off absolute polarity as "a thing we can hear" in audio.  But maybe I'm wrong.

Brian.

mojave:

--- Quote from: blgentry on May 12, 2017, 06:43:07 pm ---Now if you are saying it's not a phase shift because it's not 180 degrees at a specific frequency, and therefor a specific time delay in miliseconds, I guess I follow that.  But I'm not sure it's relevant to the OP's desires.
--- End quote ---
Inverting polarity and a phase shift of 180 degrees are two different things. I realize the OP wants a polarity switch and was clarifying that it doesn't change phase.

Phase & Polarity: Causes And Effects, Differences, Consequences

Are Are You Confusing Polarity with Phase?

blgentry:
Ok, so you were speaking technically correctly to clarify the term.  Just FYI, I have a degree in Electrical Engineering and I've done a decent amount of work with pro sound equipment and have spent time in a recording studio.  I know what phase differences are.  :)

That being said, the "industry term" is "phase reversal" or "180 degrees out of phase".  I've worked in the audio business as well and that's the term that's used all over.  Whether it's right or not.

This might be analogous to a situation I had once.  A guy from a car mechanic (and customization) shop came over and asked us (the place I worked at) for sound deadening material.  He said it couldn't be more than 2 mils thick.  Mils, in measurement, means thousands of an inch.  Two mils is 0.002 inches in thickness.  All of our material was substantially thicker.  After 10 minutes of back and forth and calling someone at his shop, we figured out that he was using the car industry term:  Mils == millimeters!  "Hey hand me that 10 mil socket."  We sold him the material and all was good.

When I hear "out of phase" I know it means polarity.  When I hear 90 degrees out of phase, I know it's a time shift which corresponds to a specific frequency with a 1/4 wavelength.  But really, no one uses that term.  Time delays, in the audio industry are specified in milliseconds or alternatively in feet or meters.

Brian.

Hendrik:
The problem starts when you have an actual 180 degree phase shift, and not "just" a polarity shift - because there is still a distinct difference - other then being an inverse waveform which a polarity switch could fix, there is also a time difference.
So its best to keep those concepts separate at all times. :)

Fun fact, I only recently noticed that one of my speakers had the wrong polarity, I must've snafued the connection when I re-wired my amplifier some weeks ago. The difference can be so subtle if you don't pay close attention.

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