A vibration correcting device comprising a movement sensor for detecting vibration, a vibration correcting system for correcting the vibration, a control circuit for controlling the vibration correcting system according to the output of the movement sensor, and a characteristics control circuit...http://www.google.com/patents/US5805212?utm_source=gb-gplus-sharePatent US5805212 - Vibration correcting apparatus controlling the gain of the control circuit 
