armans wrote:Isnt phase just a small part/increment of polarity?
No. Polarity is basically whether the signal starts in a positive direction, or a negative one. It can apply to both cyclical and transient signals.
Phase can only
relate to cyclical signals, and describes a position part way through the whole cycle in degrees (where 360 degrees is a full cycle).
If I have two tracks with the same sine wave in my DAW and nudge or delay one they will be out of phase. If I keep nudging there is a point at which they will be completely out of phase. Isnt this the same as opposite polarity?
They will appear
to have opposite polarity if you view only a part
of the whole signal, but it's not strictly the same thing at all!
The confusion of these terms comes from the notion that (considering a sinusoidal signal), a phase shift of 180 degrees looks
exactly like a polarity inversion.... but it really isn't because a phase shift of 180 degrees inherently involves a time delay equivalent to half the wavelength whereas a polarity inversion is instantaneous and doesn't involve a (frequency-dependent) delay!
So, a polarity inversion is an inversion of the signal voltage whereas a phase shift involves a frequency-dependent delay.