Patent ID: 7590926
Filing Date: 2009-09-15
Classification: G11B,H03M

Abstract:
1. A decoding apparatus for decoding an encoded signal on the basis of a plurality of state-transition trellises having different state counts, comprising: decoding means for decoding a plurality of bits from multiple time slots of said encoded signal at a single state transition on the basis of a first state-transition trellis or a second state-transition trellis, the first state transition trellis being different from the second state transition trellis; and mode selection means for selecting either a first operating mode based on said first state-transition trellis or a second operating mode based on said second state-transition trellis, the first state-transition trellis having a state count greater than said second state-transition trellis, and includes all the states in the second transition trellis, wherein, if said mode selection means selects said second operating mode, said decoding means switches from decoding said encoded signal by carrying out a first state transition selected from said first state-transition trellis to decoding said encoded signal by carrying out a second state transition selected from said second state-transition trellis.