Viterbi decoding apparatus, viterbi decoding method and optical storage system

The invention provides a viterbi decoding apparatus, a viterbi decoding method and an optical storage system. The exemplary Viterbi decoding apparatus includes a Viterbi decoder and a level information generator. The Viterbi decoder is arranged for generating a first binary signal by decoding an input signal according to target level information. The level information generator is arranged to support a plurality of different hardware configurations each for level information generation, and operate in a target hardware configuration among the different hardware configurations to generate the target level information to the Viterbi decoder. The viterbi decoding apparatus, the viterbi decoding method and the optical storage system can provide a relatively accurate level setting/definition for the viterbi decoder so as to improve accuracy and stability of the viterbi decoder.