Discrimination circuit capable of automatically optimizing discrimination level and discrimination phase

摘要

In controlling a discrimination level V1, V1 is controlled so that discrimination results based on discrimination levels V1+ DELTA V and V1- DELTA V each become equal to the discrimination result based on the discrimination level V1. If the discrimination result based on V1+ DELTA V does not agree with the discrimination result based on V1, V1 is lowered, and if the discrimination result based on V1- DELTA V does not agree with the discrimination result based on V1, V1 is raised. In controlling a discrimination phase PHI 1, PHI 1 is controlled so that discrimination results based on discrimination phases PHI 1+ DELTA PHI and PHI 1- DELTA PHI each become equal to the discrimination result based on the discrimination phase PHI 1. If the discrimination result based on PHI 1+ DELTA PHI does not agree with the discrimination result based on PHI 1, PHI 1 is delayed, and if the discrimination result based on PHI 1- DELTA PHI does not agree with the discrimination result based on PHI 1, PHI 1 is advanced.