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This paper describes a method of controlling the clock frequency of a high Q switthed capacitor notch filter to remove the power line interference from audio signals.Switched capacitor filters are capable of extremely high 0 values so a tracking technique is essential and the method presented is based on auto-correlation values using only three points in a period of the mains.This enables a microprocessor to both correlate in software and control the filter clock frequency.
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J.H. Atherton (2024) studied this question.
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