Abstract: A mobile telephone includes an expansion slot to which the expansion stick of an expansion display unit is attached by insertion in the manner capable of being taken out and put in freely. The expansion display unit is provided with an expansion display section having a display surface larger than that of the main body display section of the mobile telephone. The mobile telephone makes the expansion display section display information to be displayed. The large display surface of the expansion display section can display much part of the contents of the information to be displayed collectively, which makes it easy to confirm the contents of the information to be displayed and improves the usability of the mobile telephone.

Abstract: Disclosed herein are decoding apparatus, decoding method, data-receiving apparatus and data-receiving method. In a decoding apparatus for carrying out a maximum-likelihood decoding process based on a Viterbi algorithm on a data train completing a convolution-encoding process, the decoding apparatus includes computation means for carrying out a trellis computation for decoding a data train completing the convolution-encoding process. The decoding apparatus further includes control means for controlling the trellis computation so as to be carried out by the computation means with processing timings in processing units each corresponding to a process carried out on n bits of pre-encoding data, in which each of the processing units is parallel processing carried out on computation results obtained for 2n states with one of the processing timings, which immediately precedes a present one of the processing timings, to find computation results with the present processing timing for the 2n states.

Abstract: The invention provides a data decoding apparatus and method by which the data rate can be discriminated at a high speed using a Viterbi decoding process. Receive data are successively Viterbi decoded beginning with the top thereof. At a point of time when receive data which may possibly be end bit position data required for data rate discrimination are Viterbi decoded, data necessary for the data rate discrimination are successively extracted, and the data rate is discriminated based on the extracted necessary data.