| 摘要 |
Disclosed is a decoding apparatus for decoding an encoded signal on the basis of a plurality of state-transition trellises having differing state counts. The decoding apparatus includes a decoding section for decoding the encoded signal on the basis of a first state-transition trellis, and a mode selection section for selecting either a first operating mode based on the first state-transition trellis or a second operating mode based on a second state-transition trellis. The second state-transition trellis has a state count smaller than that of the first state-transition trellis. If the mode selection section selects the second operating mode, the decoding section decodes the encoded signal by carrying out a state transition switch from a first state transition to a second state transition.
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