| 摘要 |
PROBLEM TO BE SOLVED: To provide an encoder signal processing circuit capable of preventing erroneous counting from being performed even when a noise signal such as mechanical fine vibration in the stopped state of a rotary encoder and preventing accumulation of shifting of count values.SOLUTION: An encoder signal processing circuit includes a circuit for generating an A-phase pulse of clock synchronization and a B-phase pulse of clock synchronization, a 4-multiplication pulse generation circuit for generating rising edge signals and falling edge signals of the A-phase pulse and the B-phase pulse of the clock synchronization, and generating a 4-multiplication pulse from the rising edge signals and the falling edge signals, an alternate checking circuit for generating a signal indicating the stop period of an encoder on the basis of whether the A-phase pulse and the B-phase pulse of the clock synchronization have been alternately input, and a circuit for generating a noise-removed 4-multiplication pulse signal from the 4-multiplication pulse during a period other than the encoder stop period. |
