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- Newsgroups: comp.dsp
- Path: sparky!uunet!munnari.oz.au!bunyip.cc.uq.oz.au!griffin!tomahawk.me.gu.edu.au!jchen
- From: jchen@tomahawk.me.gu.edu.au (Jinghong CHEN)
- Subject: Re: DSP and Control
- Message-ID: <1992Nov22.221736.14616@griffin.itc.gu.edu.au>
- Sender: news@griffin.itc.gu.edu.au
- Nntp-Posting-Host: tomahawk.me.gu.edu.au
- Organization: Griffith University, Brisbane, Australia
- References: <1ednj3INNnup@daisy.ee.und.ac.za> <1992Nov19.222938.28354@griffin.itc.gu.edu.au> <sjreeves.921120110631@fourier.ee.eng.auburn.edu>
- Date: Sun, 22 Nov 92 22:17:36 GMT
- Lines: 38
-
- In article <sjreeves.921120110631@fourier.ee.eng.auburn.edu> sjreeves@eng.auburn.edu (Stan Reeves) writes:
- >
- >This is not only an oversimplification of the situation; it's just
- >plain inaccurate. DSP is *not* a subset of controls. And DSP uses
- >transfer functions all the time. That's exactly how a lowpass filter
- >is characterized! DSP and controls use many of the same techniques but
- >with different goals. The goal of DSP is simply to process signals --
- >to manipulate them into a form that is in some sense more useful
- >(Fourier transforms, lowpass filters, deconvolution, compression,
- >etc.). In controls, the goal is to control a process. Sometimes this
- >involves manipulating signals, but that isn't an end in itself. The
- >goal is to achieve a specified output given a physical system.
-
- However a complete control system has input signals which also need to be
- manipulate into a form that is in some sense more useful.
-
- >As an example, if DSP is a subset of controls, then I would like to
- >know how data compression fits within a controls framework. (I realize
- >that one can make analogies, but that's not the same as saying that
- >compression is a controls problem.)
-
- The inputs of a control system can be anything including compressed data and
- images. For instance a polymer reactor control system controls the molecular
- size based on a compressed image data (gif format) taken by a micrographier.
-
- >Stan Reeves
- >Auburn University, Department of Electrical Engineering, Auburn, AL 36849
- >INTERNET: sjreeves@eng.auburn.edu
-
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