Methods and apparatus for decoding control signals in dispatch trunked radio system

摘要

A system for decoding encoded data from the control channel of a trunked dispatch system, and for detecting the presence of subaudible handshake data on an assigned voice channel of the trunked dispatch system. The decoder includes a de-interleave, an auto synchronization sequence combiner, and a table lookup error detector to recover the transmitted information and also indicates whether any errors are present in the recovered information. The subaudible handshake detector includes a comparator/limiter, a data sampler, a pattern matcher, and a signal/noise discriminator to indicate the presence of the subaudible handshake on an assigned voice channel of the trunked dispatch system.