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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: Mon, 5 Feb 96 13:51:15
- Organization: Private node.
- Distribution: world
- Message-ID: <19960205.4A5880.C5D2@ak145.du.pipex.com>
- References: <wfblanDL5rJB.IK8@netcom.com> <judas.0ho5@tomtec.abg.sub.org> <4ekcsm$13p@news.jhu.edu> <19960130.423F88.EE88@an184.du.pipex.com> <4f4cre$3pi@news.jhu.edu>
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- Zsolt Szabo (robodude@deanwong.rad.jhu.edu) wrote:
- : In article <19960130.423F88.EE88@an184.du.pipex.com>,
- : Mathew Hendry <m.hendry@dial.pipex.com> wrote:
- :
- : >It has a lot to do with it. Lower sampling rates remove more information,
- : >hence the noise level is increased. Exactly how much it increases depends on
- : >the frequency distribution of the original signal and the sampling rate you
- : >use, _as well as_ the quantization characteristics and other factors.
- : >
- :
- : Reduced information in the frequency domain does not in anyway
- : result in noise. Aliasing does not produce what is generally perceived to
- : be noise. Sampling at low frequencies "blurs" the audio image but this
- : is entirely different from adding "noise", which would be more like adding
- : "speckles" to the image.
-
- Au contraire. Noise measurements quantify the difference between the original
- signal and the processed signal. Removing higher frequency information alters
- the signal, ergo noise is introduced.
-
- If you wish to restrict the definition of noise to that introduced at the
- quantization stage, refer to it as quantization noise.
-
- -- Mat.
-