Methods and apparatuses for decoding and encoding video are provided. The method and apparatus permit users of H. Fixation means are affixed to the ilia and both a rigid, subcutaneous anteriorly bowed elongated plate and a subcutaneous posterior plate are connected between the fixation means. The second power disconnection device includes a clutch having a first set of clutch plates fixed for rotation with the differential gearset output. A control current which controls the transconductance of the transconductance circuit is generated in response to the notch filter. An illumination element is provided for facilitating visualization in low-light conditions.