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Temporal distortion - measurable?
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Posted on November 20, 2002 at 21:30:23 | ||
Posts: 323
Location: So. California Joined: June 28, 2000 |
Hi,Prop-Heads: One of the unmeasurables in audio is temporal distortion: most measurements assume a continuous sine wave, and ignore transients. For example, in a two-way loudspeaker with a slow woofer and much faster tweeter, even with "time-alignment", phase shift differences between the woofer and tweeter in the crossover can't be corrected "mechanically". Negative feedback amps magnify temporal distortion by correcting a delayed signal and modifying the output, but the "corrected" signal arrives at the loudspeaker well after the original transient signal that triggered the correction. The result is that the feedback actually creates distortion. I don't have electronic skill sets, so am unable to do any experiments to confirm or disprove this hypothesis: could some of the electronic / audio prop-heads out there tell me if my observation is correct or not, and why? Best regards, rdb :-) As a result, temporal distortion is endemic. |