Phase distortion

Short description: Nonlinear phase response to filters

In signal processing, phase distortion or phase-frequency distortion is distortion, that is, change in the shape of the waveform, that occurs when (a) a filter's phase response is not linear over the frequency range of interest, that is, the phase shift introduced by a circuit or device is not directly proportional to frequency, or (b) the zero-frequency intercept of the phase-frequency characteristic is not 0 or an integral multiple of 2π radians.

## Audibility of phase distortion

Grossly changed phase relationships, without changing amplitudes, can be audible but the degree of audibility of the type of phase shifts expected from typical sound systems remains debated.[1][2][3]

## See also

* Audio system measurements
* Phase noise

## References

1. ↑ "Audibility of Phase Distortion". 1997. http://www.silcom.com/~aludwig/Phase_audibility.htm.
2. ↑ Lipshitz, Stanley P.; Pocock, Mark; Vanderkooy, John (1 September 1982). "On the Audibility of Midrange Phase Distortion in Audio Systems". Journal of the Audio Engineering Society 30 (9): 580–595. http://www.aes.org/e-lib/browse.cfm?elib=3824.
3. ↑ "Human Hearing - Phase Distortion Audibility". http://www.audioholics.com/room-acoustics/human-hearing-phase-distortion-audibility-part-2.

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