增量式磁旋转编码器作为转角位置传感器，可以用四倍频的方法提高其测量精度。
The incremental magnetic rotary encoder, as a corner position sensor, can be improved its measure accuracy by the way of quadruplicated frequency circuit.
增量式光电位移传感器需辨向，一般给出的为硬件辨向电路。
The incremental photoelectric shift sensor needs to recognize direction, which is often done by the circuit of direction recognition with hardware.
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