An improved latch arrangement for an electronic digital system is disclosed. According to the invention, during the speech phase, information on the percentage proportion of broadband active speech frames in comparison to narrowband active speech frames is compiled on the part of the decoder. A first insulating film is formed over the element isolation portion and the first and second diffusion regions. The bed trunk also includes locking clamps to firmly secure the bed trunk within the pickup bed to prevent theft or removal of the bed trunk from the pickup without access to the truck cavity.