Digital communication apparatus having an error detecting section

Claim 1

A digital communication apparatus used in a communication system wherein a predetermined volume of message signals are transmitted with a check code, the check code being generated from the corresponding predetermined volume of message signals, the message signals being classified into a plurality of categories depending on a transmission rate, the plurality of categories of the message signals being allocated in a preassigned field of a frame signal, the frame signal being transmitted with an associated synchronization signal over a radio link, comprising: receiving means for receiving signals transmitted over the radio link and for providing received signals, said received signals comprising a plurality of categories of message signals allocated in a preassigned field of a frame signal and an associated synchronization signal; timing generation means for generating a plurality of timing signals based on said synchronization signal; a plurality of storage means for storing message signals included in the received signals, said storage means each storing a category of message signals; first coupling means responsive to a first timing signal of the plurality of timing signals for selectively coupling said receiving means to one of said storage means; detecting means for detecting whether the signals applied to said detecting means include error signals based on the check code following the predetermined volume of the message signals; and second coupling means responsive to a second timing signal of the plurality of timing signals for selectively coupling one of said storage means to said detecting means.