Phase distortion

Phase distortion: Distortion that occurs when (a) the phase-frequency characteristic[?] isn't linear over the frequency range[?] of interest, i.e. , the phase shift introduced by a circuit or device isn't directly proportional to frequency, or (b) the zero-frequency intercept of the phase-frequency characteristic isn't 0 or an integral multiple of 2π radians. Synonym phase-frequency distortion.

Source: from Federal Standard 1037C and from MIL-STD-188

		Phase distortion
		Phase distortion: Distortion that occurs when (a) the phase-frequency characteristic[?] isn't linear over the frequency range[?] of interest, i.e. , the phase shift introduced by a circuit or device isn't directly proportional to frequency, or (b) the zero-frequency intercept of the phase-frequency characteristic isn't 0 or an integral multiple of 2π radians. Synonym phase-frequency distortion. Source: from Federal Standard 1037C and from MIL-STD-188
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