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Encyclopedia > Phase distortion

Phase distortion: Distortion that occurs when (a) the phase-frequency characteristic is not linear over the frequency range of interest, i.e. , 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.


Synonym phase-frequency distortion.


See also: Audio system measurements


  Results from FactBites:
 
distortion: Definition and Much More from Answers.com (1996 words)
Note that the phase of the sine wave is different for the lowpass and the highpass cases, due to the phase distortion of the filters.
Amplitude distortion is distortion occurring in a system, subsystem, or device when the output amplitude is not a linear function of the input amplitude under specified conditions.
Crossover distortion is a type of distortion in class-B push-pull amplifiers where, due to the forward voltage of the base-emitter junction of the output BJTs, the output signal does not follow the input until the input exceeds this forward voltage.
Audibility of Phase Distortion (1808 words)
The observation that phase is very audible under some conditions is certainly not new, and is stated emphatically in an excellent paper by Lipshitz et.al.
In a correspondence with Dr Lipshitz he pointed out that it the phase of the second tone is 0-degrees instead of 90-degrees, that the asymmetry in the positive and negative directions is greater.
Note: If the phase of the 400 Hz tone is shifted by 180 degrees, after one cycle of the 400 Hz tone it just repeats, but the 200 Hz tone has undergone a 180 degree phase shift.
  More results at FactBites »


 

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