the image https://ibb.co/zFX10qt

 

Because phase is measured as an angle, and angles wrap around, so when it gets to +179 degrees it goes to -180 degrees because 180 degrees ahead is the same as 180 degrees behind, and vice versa

 

High/Low Pass Filter will shift the phase 180 degrees. The image you're showing is 180 degrees phase rotation which is the phase response of High Pass Filter EQ move you did on the Pro-Q3.

 

It shows the truth.

 

i wanna know what shows the link line https://ibb.co/RDMtJVQ

 

I don't think I understand your question. Sound is made up of sine waves. The phase of a sine wave is represented on a circle. A circle is 2*pi radians. The analyser shows the change of the phase of a sine after it goes through the plugin, from 0 (no change) to +pi and -pi (full rotations). Fully rotating means you're back at the beginning. The 'line' is an 'illusion', you're just back at the beginning of the circle. There's no 'line' as such.

 

as stevie wrote thats a "180 degrees phase shift rotation", it's due to the "high pass filter"

plugin doctor is telling you that the phase of the waveform is being shifted of 180 degrees thats all
practical consequence? well hard to say if you dont know the concept, anyhow it means that putting the same signal in parallel but without the same EQ move would cause "sound cancellation in the zone of the phase shift", but I writing it in a very easy way, lets say...

every high pass filter results in that kind of curve in the digital world (lets say this way...) if you put the EQ in linear phase mode it will disappear (and bring other problems, but thats a whole different story,,,and very very long one lol)

 

"every high pass filter results in that kind of curve in the digital world"

... as in the analog world exactly the same.

 

I'm with everyone here. I don't really understand this question. @xorome already mentioned about the sine wave. For PD, it's using a simple single fundamental sine wave for the test and the result you're getting is the phase rotation of that sine wave going through the processing of the ProQ3.

 

yeah my man! just meant in a very few words that we didnt give a sheesh back then we were happy without plugin doctor lol

anyhow well pointed thanks