A turbomachine blade includes a metal alloy airfoil having a cavity closed off by a cover on a hollowed side, the cover providing aerodynamic continuity of the hollowed side and being bonded via an edge thereof to the rest of the airfoil by a weld bead. The invention uses a distributed computing model that places the power-consuming tasks such as disk storage in a wired base station, and uses lightweight full-function rechargeable battery powered handsets that operate wirelessly for convenience throughout the user’s location. A first group j of transducer segments is selected in such a way that a parallel activation of these transducer segments results in a circular active surface Fj of the ultrasonic transducer. All of the magnetic steel sheets are divided into groups each of which includes axially-adjacent n of the magnetic steel sheets, where n is an integer not less than 2. An MDCT coefficient is approximated by the dot product of a phase vector computed using the block phase with a corresponding row of the window summation table. The first transceiver is able to receive, over at least a subset of the set of wires utilized for the downstream multiplexed transmission, an upstream transmission comprising a second direction of the bidirectional data channel.