Abstract: In a hands free communications terminal apparatus, a loudspeaker and a microphone are permitted to be simultaneously active. A controller monitors signals in transmit and receive paths to direct operations of transversal filters to provide two echo canceller functions, one for the microphone and one for a telephone line so that most unwanted echo and feedback is removed, to prevent the howling and squealing sounds that commonly occur when the loudspeaker and the microphone are both active. Remaining echoes are removed by voice switching of loss between transmit and receive paths, wherein the amount of loss is determined in response to characteristics of the telephone line and the operating environment of the terminal apparatus.

Abstract: A training wheel assembly for a bicycle including brackets for attachment to the body of the bicycle and a pair of auxiliary wheels supported by the brackets for engagement of the ground distally of and to opposite sides of the bicycle utilizes a link member connected between each auxiliary wheel and a corresponding bracket and cables operatively attached between the front wheel of the bicycle and the link member. Each auxiliary wheel is journaled at its center to a link member for rotation relative thereto, and each link member is connected to the corresponding bracket for pivotal movement relative thereto so that when the brackets are operatively attached to the bicycle body, the center of the auxiliary wheels are pivotally movable relative to and about the bracket between a raised condition and a lowered condition.