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%FEEDBACK CONTROL IDEALS-1 850511
Feedback is used in many technical situations as the
basis of keeping some desired process under control. in a
radio receiver amplification of the received signal is
augmented by a measured amount of feedback of the
amplified signal which is added to the received signal.
The businessman uses feedback to control purchase of
replacement merchandise; information about what is selling
well goes to the purchasing department to help make
decisions about what additional merchandise to purchase
for future sales. In manufacturing automatic measuring
devices monitor dimensions of produced goods and
information is feedback to the part of the machine which
controls that dimension so as to keep the product within
specifications. In each instance selected information is
feedback to the part of the machine which controls that
dimension so as to keep the product within specifications.
In each instance selected information is feedback in a way
which provides some control over a process.
In some situations feedback leads accidentally to
undesired amplifications. Sounds amplified by a public
address system may feedback to the microphone location
with an amplitude louder than the original sounds. Such
feedback is accidentally selective as regards frequency.
Only one or a few frequencies of sound are feedback louder
than the original sound; and those sounds generate a very
undesirable squawk which overwhelms the sounds of the
speaker who may have made the original sounds. In another
situation such selective feedback is deliberately used to
generate a strong signal of just one frequency in a device
called a "signal generator".
The effect of feedback depends upon the situation,
the selection of just what information/effect is feedback,
and the consequences of that selective feedback. Often
situations involve accidental feedback mechanisms which
are not recognized by the people who are being affected
and/or participating in the feedback process. The
selection process may be dominated by ideals and values
which have not been thoughtfully examined in terms of the
consequences to which they lead through the feedback
process. Feedback may thoughtlessly lead to
amplifications of social tendencies which are genuinely
tragic in their long-term consequences.
If we are to avoid long-term tragic consequences we
need to carefully examine the feedback process in which we
are participants. Such an examination can not be
objective because it is essentially a reflective and
reflexive process.
(c) 2005 by Paul A. Smith in
www.essayz.com Search for Integrity and Honesty
(On Being Yourself, Whole and Healthy)
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