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RE: Audibility of group delay

If you take a reasonable length of good coaxial cable, properly terminated, it has a constant delay time from DC to very high frequency. The phase shift from the signal at one end to the signal at the other end is therefore zero at DC, and increases linearly with frequency. This constant derivative of phase with respect to frequency is the ideal response for many signals, since it only delays the signal while not affecting the shape, etc. However, 40 years of coax at 1.5 nsec per foot (27 light-years of length) and 0.2 dB per 100 feet (1 MHz) would give a lot of attenuation, even at audio.



Edits: 04/30/12

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