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Hardware Emitter Processor Disclosure Number: IPCOM000034259D
Original Publication Date: 1989-Jan-01
Included in the Prior Art Database: 2005-Jan-27

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Heybruck, WF Malkemes, CD Rawson, AR VonderHaar, MR [+details]


A quadrature type emitter, which generally utilizes a motor shaft- mounted emitter disk with two sensors 90 degrees apart, permits determination of motor rotation direction by analysis of the phase-shifted output pulse trains of the two sensors. This is usually accomplished by a microprocessor. The present embodiment is a hardware processor using a state machine architecture. Fig. 1 shows the output pulse trains of two such emitter sensors, represented as Channel A and Channel B, including a change in direction of rotation, or Turn Around.