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In Reply to: RE: Better duck under that desk; posted by Ryelands on August 10, 2009 at 06:26:29:
Oh, Kunchur agrees:
"details of the fuzzy merger do indeed depend on N: if the star images are moved closer together, the digital data of the sampled image will be different as long as the image shift exceeds L/N"
Which just says that depending on the ADC resolution a sampled system can encode spatio (or temporal) features smaller than the pixel pitch (or sample period).
But then come:
"the two stars will not be resolved separately and will appear as a single larger merged spot. In this case the essential feature (the fact that there are two separate stars and not an oblong nebula) has been destroyed."
"applies to the coding itself and not to the system's ability to resolve essential features in the signal as described above "
"This latter quantity has no direct bearing on the system's ability to separate and keep distinct two nearby peaks and hence to preserve the details of musical sounds."
Above three lines state as much times that according to Kunchur it is mandatory that a system preserves "essential features", and what are these features? Well: keeping two 5-us-separated impulses separate.
That's what K claims: that an audio system has to pass two impulses less than 5 us apart.
Where is the proof that such is required for audible transparancy?
There is none. All we get are the experiments followed by an "and hence ...".
By the way: the optical analogy Kunchur cites is only a valid analogy to CD audio when the pixel display is viewed from a distance so that the
angle subtended by a single pixel is slightly smaller than half of
the angular resolution of the human eye. Only this reflects fully the
case of a 22kHz-limited system with an assumed <20kHz aural bandwidth.
And you know what? Under such circumstances would the eye merge the
two stars somewhat before the camera+display would.
But I'm fed up with this. Let this thread die. If anything more comes of it then I'm sure it will be posted at Hydrogen.
And then you wake up and realise that your classmates of old ... are running most of the TV shows.
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Follow Ups
- RE: Better duck under that desk; - Werner 08/10/0906:50:25 08/10/09 (0)
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