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- Path: soap.news.pipex.net!pipex!usenet
- From: m.hendry@dial.pipex.com (Mathew Hendry)
- Newsgroups: comp.sys.amiga.audio
- Subject: Re: Paula chip and Amiga audio
- Date: Thu, 22 Feb 96 18:16:51
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- Peter Beck (peterbe@cogs.susx.ac.uk) wrote:
- : Michael van Elst (mlelstv@serpens.rhein.de) has been known to utter the following:
- : : peterbe@cogs.susx.ac.uk (Peter Beck) writes:
- :
- : : >The hissy sounds that you pick up when
- : : >sampling at low frequencies is not actually noise, but distortion.
- :
- : : Noise is every deviation from the ideal signal. The "hissy sounds" are
- : : probably aliasing artifacts that are surely noise.
- :
- : Not true. Cross over distortion for example is not noise, yet it deviates
- : from an ideal signal, does it not? Noise is usually defined as white noise,
- : which is completely random.
-
- No. White noise is a specific type of noise, which is why it has a specific
- name. Not all noise is white noise.
-
- : Anything that is predictable i.e. aliasing, is usually defined as distortion.
-
- Where are you getting this definition of noise from? No engineering text would
- support it. Noise is _any_ deviation from the original signal, predictable or
- otherwise. Whether you ignore noise in specific frequency ranges depends on
- the application, but ignored noise is still noise.
-
- 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.
-
- -- Mat.
-