Apparatus and method for reducing errors in data caused by noise through use of blanking
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United States of America Patent
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-
Oct 31, 1995
Grant Date -
N/A
app pub date -
Apr 8, 1994
filing date -
Apr 8, 1994
priority date (Note) -
In Force
status (Latency Note)
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Abstract
An apparatus for snubbing or blanking digital signals representing a band of signals that includes an encoded carrier signal transmitted over a power line. An average signal level is compared with the instantaneous signal level to develop a blanking circuit control signal. Additionally, snubbing occurs in the circuit which determines the average signal level to prevent noise from building-up the average signal level. A hold-off signal is used in this circuit to prevent the average signal level from being latched permanently low. A unique infinite impulse filter subtracts out the D.C. offset thereby improving the dynamic range of the blanking. Additionally, the average signal level is used by AGC logic to control the gain at the front end of the apparatus. The state and switching of the AGC is controlled to minimize errors.
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