I’ve often asserted that the human ear is a frequency sensor, and phase changes or phase distortion don’t affect hearing. It’s high time for a demonstration!
When Single Sideband (SSB) is implemented using the filtering method, the phase gets rather distorted. However, with the phasing method, phase information can be preserved. Some say that means better quality audio. This video demonstrates changing the phase between a fundamental frequency (256 Hz, about Middle C) and the 2nd harmonic (512 Hz, about High C). See if you can tell the difference. It’s obvious on the oscilloscope, but no matter the phase difference, it all sounds the same to me!