Absolute polarity? I.e. a 180 degree phase shift at all frequencies?
Would you say that this GD trace is derived from this phase response? It doesn't look that way to me..
Phase:
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GD:
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You added phase shift in a similar way as you now added GD?
It is. At 100hz, the +-10ms irregularities on the GD actually corresponds to one complete 360 deg cycle.
Ok, but how can you have DG less than 10ms in a room that isn't anechoic? Reflections will make sure GD (and everything else related to time domain) is all over the place..
That's unusual. Normally, most people agree on audibility of absolute polarity changes to specific typical test signals, for example a highpass-filtered unity step stimulus, with good headphones.I did experiments for absolute phase once, and could not hear any difference at all. I tested using both music signals and transient test signals.
It isn't really 10ms, fluctuations are larger. But mean is close to zero. It will end up like this when early reflection level is sufficiently low.
Early reflections can be "sufficiently low" only in an anechoic environment. Average living room, even if treated to be pretty decent for music listening, will have all kind of reflections (early and late) and they will not be low. Filters that I created have corrections in time domain as well and yet you saw how GD looks when measured at LP if I don't apply IR windowing.
So, is your room anechoic and how exactly did you measure GD? Was it a nearfield measurement? Have you applied any gating (windowing)?
I am lost. I usually enjoy this kind of discussion. This one is flying way above my head. Is there a way to put all this in layman terms?
I am trying to get a sense of what you heard. The only way to do that is to have a capture of the sound produced in your room. My headphones won't match what you heard. And at any rate, literature already stated that phase effects are audible in headphones and anechoic conditions.But why? It is much better to listen to the samples yourself. You could try headphones, I did not do that.
The moment you put speaker in a "normal" room reflections will cause GD of more than 20ms up to several kHz.
I am trying to get a sense of what you heard. The only way to do that is to have a capture of the sound produced in your room. My headphones won't match what you heard. And at any rate, literature already stated that phase effects are audible in headphones and anechoic conditions.
Which one did you test? 20 msec or 100 msec GD?Using headphones, and could not hear any difference. Loud or not. Figured it out - sort of, after some listening - I can hear a difference, on headphones.
Normal speaker - Blue
Abnormal Speaker - Red
Same room, speakers adjacent, unsmoothed
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I think you can apply 1/12 smoothing to get a clearer picture. Btw, "abnormals" are MLs?
I can turn the knob on my binoculars and smooth things out too.
I don't think that is a good analogy.