- The reading system usually adopts a differential method, that is, two different signals with the same waveform but a phase difference of 180° are compared in order to improve the quality and stability of the output signal.
- Incremental encoders give two-phase square waves, their phase difference is 90°, usually called A channel and B channel.
- One of the channels gives information related to the speed. at the same time, the two channel signals are compared in order to obtain the information of the rotation direction.
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