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Exponential Predictor and Sample Data Systems

IP.com Disclosure Number: IPCOM000077940D
Original Publication Date: 1972-Oct-01
Included in the Prior Art Database: 2005-Feb-25
Document File: 2 page(s) / 32K

Publishing Venue

IBM

Related People

Buhler, OR: AUTHOR [+2]

Abstract

A sampled variable or data is modified, between sample times, by a predictor whose exponentially decaying output is continuously available for use by an analog continuous-control output device.

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Exponential Predictor and Sample Data Systems

A sampled variable or data is modified, between sample times, by a predictor whose exponentially decaying output is continuously available for use by an analog continuous-control output device.

The figure shows a closed-loop system, having a process 40 which includes condition changing means 41 and condition sensing means 42. A continuous, analog output signal on conductor 43 is sampled, usually at a periodic interval, by sampler 44, to in turn provide a sampler 44, to in turn provide a sampled-data signal on conductor 45. Signal 45, having a steady-state value between sampling times, is modified by predictor network 46 to provide a time-diminishing output on conductor 47, this output constituting a feedback signal for continuous controller 48. Controller 48 also receives condition commands on conductor 49 and provides continuous analog control to condition changing means 41 by way of conductor 50.

Predictor network 46, which may be an RC differentiating circuit, is constructed to have a time constant, producing the required time-diminishing output, which is of the order of the time constant of response. Sampler 44 is effective, at each sample time, to reset predictor network 46 by way of reset conductor 51, and to restore the charge of the RC capacitor thereof to substantially zero.

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