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