Signal evaluation circuit for a motion detector
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United States of America Patent
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Aug 19, 1997
Grant Date -
N/A
app pub date -
Nov 15, 1995
filing date -
Mar 24, 1994
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
The motion detector generates a sensor signal (SS) which contains a direct current portion and an alternating current portion. The signal evaluation circuit (3) contains means for filtering out the direct current portion, an analogue-to-digital converter (4) and an amplifier for the alternating current portion of the sensor signal. The analogue-to-digital converter (4) is provided for the direct digitizing of the entire sensor signal (SS) and the means for filtering out the direct current portion are formed by a digital high-pass filter (5) connected downstream of the analogue-to-digital converter.
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