Typically mains-hum is exactly 50Hz or 60Hz, and only a few harmonics, so only a handful of notches are required.
But in your example a standard 50Hz de-hum filter misses the target, and the full 150 odd harmonics are necessary …
Typically mains-hum is exactly 50Hz or 60Hz, and only a few harmonics, so only a handful of notches are required.
But in your example a standard 50Hz de-hum filter misses the target, and the full 150 odd harmonics are necessary …