Decoder

Abstract From the Canadian patent

A data decoding system includes a data retrieval device which retrieves encoded data from a mass-storage device and transmits the data to a serial-to-parallel shift register. The shift register, operating at the data transfer rate converts, the encoded data to a parallel stream of bit-pairs. The bitpairs are then transmitted, over parallel lines to a second, shift register which is operating at one-half the data transfer rate. The second shift register stores a sufficient number of the bit-pairs to constitute a byte of binary data when decoded. Once enough bit-pairs are stored a ROM, operating at a rate, which is slower than the data transfer rate decodes the, information to form a byte of …