Registers – Coded record sensors – Particular sensor structure
Patent
1997-10-02
1999-07-13
Le, Thien Minh
Registers
Coded record sensors
Particular sensor structure
23546201, G06K 710
Patent
active
059230240
ABSTRACT:
Apparatus for producing an output signal responsive to a sensor signal having a unit for setting desired hysteresis values and desired reference values of the sensor signal, aunit for detecting whether the sensor signal has a positive or negative slope with respect to time, a unit for triggering one logical signal when the sensor signal has a positive slope and also exceeds one reference value minus a first hysteresis value, and a unit for triggering another logical signal when the sensor signal has a negative slope and also falls below the sum of a second reference value and a second hysteresis value. The apparatus and method may have more than two reference values and/or more than two hysteresis values simultaneously. The apparatus may be implemented by an embedded microcomputer of conventional type, programmed to perform the signal-processing disclosed. The steps of the process and initial values of the reference values and hysteresis values may be stored in a read-only memory. The method for controlling an output signal responsive to a sensor signal includes steps of setting first and second hysteresis values, setting first and second reference values of the sensor signal, detecting whether the sensor signal has a positive or negative slope with respect to time, triggering a first logical signal when the sensor signal has a positive slope and also exceeds the first reference value minus the first hysteresis value, and triggering a second logical signal when the sensor signal has a negative slope and also falls below the sum of the second reference value and the second hysteresis value. Both reference values and hysteresis values are preferably made programmable by a user. When more than two reference values and/or more than two hysteresis values are used simultaneously, each of those values is programmable.
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Angstrom Technologies, Inc.
Le Thien Minh
Touw Theodore R.
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