Abstract: Aspects of the present disclosure relate to power management techniques for reducing the power consumption of playback devices. Additionally, aspects of the present disclosure related to distributed processing techniques for processing audio across two or more processors.

Abstract: A board for commutation of a brushless motor having an encoder comprising a plurality of Hall-effect sensors operative for providing commutation information to a motor controller including an output drive section which comprises three high-side power FET's and three low-side power FET's connected to determined stator windings of the brushless motor. A low-side pre-drive circuit is operative to selectively turn on each of the low-side FETs and a high-side pre-drive circuit is operative to selectively turn on each of the high-side FETs. A commutation decode logic circuit is connected to the Hall-effect sensors to receive the commutation position information from the Hall-effect sensors and is connected to the high-side and low-side pre-drive circuits for providing selection signals for selecting the appropriate power FETs for commutating the motor. The board is preferably affixed to the end of the brushless motor.

Abstract: A blade heater (10) for an aircraft engine propulsor blade (14) has a foil pattern (18) which is comprised of a plurality of elements (25-56). The resistance of the elements (25-56) varies according to the distance between the elements (25-56) and the leading edge (12) of the blade (14).