APPARATUS FOR SYNCHRONIZING FRAMES IN CHANNEL IN TIME-SHARING MULTI-SYSTEM

摘要

PURPOSE: An apparatus for synchronizing frames within channel in a time-sharing multi-system is provided to decide frame synchronization from a transmitted bit stream without adding additional frame synchronous bits. CONSTITUTION: An output buffer(10) stores a bit stream of 80 bits each 10msec and outputs the bit stream corresponding to a size of channel bit width. A channel(20) has a bit bandwidth of a particular size. An input buffer(30) is used for storing the bit streams outputted from a decoder and outputting the stored bit streams in bit units of 80 bits. A parity tester(50) performs a parity check operation by executing an exclusive OR operation for measuring bits from an input bit stream of the decoder. A synchronous detector(60) is used for searching a location of the frame synchronization by using a result of the parity tester(50). A data synchronization portion(40) outputs the bit stream of 80 bits by using the location of the frame synchronization.