When recording digital data corresponding to a voice signal, a voice data recording and reproducing apparatus generates an error correction code and records this code together with the digital data in semiconductor memory. The aid device comprises detection means for, in case of detection by the physical layer of the master station of a frame pulse received from the network, triggering the sampling of the value of the master counter. The bracket is of substantially triangular shape comprising a support plate, a vertical rod member, and a reinforcing truss. A P-type source diffusion region, which connects to the source electrode, defines the other end of the gate region. The separate purge air channel minimizes pressure loss in the serpentine flow and maintains high flow velocity to cool the lower end of the leading edge wall.