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RE: Interesting Video Audio Myths

As has already been pointd out earlier, this video has been around for quite some time now. It is very informative, in it's hands-on demonstrations utilizing continuous signals. What it leaves out is an effective demonstration of transient signal handling.

The sampling theorem is predicated not only on signals being band limited, but also on them being infinitely continuous - not only continuing past the end of the universe but, just like God, having always existed. Any other kind of sampled and reconstructed signal is mathematically imperfect. The degree of imperfection is a function of the signal's duration. The shorter the duration, the geater the imperfection. Conversely, as the signal duration lengthens, the more rapidly the imperfection shrinks to insignificance.

Signal duration caused imperfection manifests as a stretching/spreading/smearing of an transient's duration, and ALL real signals are transient to some degree or another (meaning, they begin and, eventually, end). The imperfection is negligible for many DSP applications, but not for all. This is what Meridian is primarily focused on with MQA. They believe that transient spreading is not an negligible effect with digital music application. I don't know whether that's corrct or not, but the reality of the transient duration smearing mechanism is easy enough to understand.
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Ken Newton



Edits: 03/16/17

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  • RE: Interesting Video Audio Myths - knewton 12:20:00 03/16/17 (0)

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