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- Path: susx.ac.uk!peterbe
- From: peterbe@cogs.susx.ac.uk (Peter Beck)
- Newsgroups: comp.sys.amiga.audio
- Subject: Re: Paula chip and Amiga audio
- Date: 4 Mar 1996 08:11:53 GMT
- Organization: University of Sussex
- Distribution: world
- Message-ID: <4he8k9$kn8@infa.central.susx.ac.uk>
- References: <wfblanDL5rJB.IK8@netcom.com> <wfblanDLKurL.6rz@netcom.com> <4e05du$4dv@serpens.rhein.de> <judas.0ho5@tomtec.abg.sub.org> <4ekcsm$13p@news.jhu.edu> <4fk2i7$bni@nntp.texas.net> <4g0gv9$aoq@infa.central.susx.ac.uk> <4g1maa$buu@serpens.rhein.de> <4gqn1g$e5n@infa.central.susx.ac.uk> <19960226.424EB0.4E16@am177.du.pipex.com>
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-
- Mathew Hendry (m.hendry@dial.pipex.com) has been known to utter the following:
-
- : No. You claimed that quantization effects are a form of noise.
-
- Thats because they are. Why do you think they call it 'Quantisation Noise?'
-
- : These effects are not random, therefore by the above definition they do not
- : constitute noise.
-
- : These effects are heavily dependent on the input signal, therefore by the
- : above definition they do not constitute noise.
-
- They are also heavilly dependent on the speed of the A/D converter and the
- accuracy of the internal D/A converter, and external effects such as noise
- which are picked up internally.
-
- : Can you spot the problem here?
-
- No.
-
- : : Mathew Hendry (m.hendry@dial.pipex.com) has been known to utter the following:
- : : : And quantization noise is no less predictable than aliasing - given a signal,
- : : : you can predict how it will be quantized, just as you can predict the effects
- : : : of aliasing.
- : :
- : : You can`t predict how it can be quantised.
-
- : If that is true, neither can you predict aliasing effects, in which case, by
- : your own definitions, aliasing is noise too. Oops, no it isn't, because
- : aliasing depends on the input signal. No wait...
-
- Pedantically speaking, you can`t predict aliasing exactly either. However the
- accuracy of the sampling clock is down to the accuracy of the clock crystal
- being used in the system, which as you may be aware has an astonishly high
- accuracy. The error level in clock crystals is so small, that it is usually
- ignored completely, hence it is fairly safe to say that aliasing effects can be
- predicted to within something like 0.0001%.
-