The invention relates to a voice recognition implementing method and
system based on a confidence coefficient. The method comprises the following steps: carrying out voice recognition of phoneme synchronous decoding from voice of a use to obtain a
word graph acoustic information structure which is synchronous to decoding information generated phoneme, generating a
confusion network on the basis of the
word graph acoustic information structure so as to establish a competitive relation between voice recognition candidate results, namely a competition probability of the
confusion network; meanwhile, establishing full search space of voice recognition by using an auxiliary search network based on a
linguistic model; calculating to obtain complete lossless full search space probability; recording a search process of the generated full search space by voice recognition of phoneme synchronous decoding; carrying out path recalling by a whole
search history so as to obtain the full search space probability; and finally, fusing the competition probability of the
confusion network and the full search space probability to obtain a judgment result of voice recognition. On the one hand, correct confidence coefficient can be given for a voice recognition result so as to improve user experiences of voice recognition; and on the other hand, consumption of calculation and memory resources of voice recognition confidence coefficient
algorithm can be reduced remarkably.