| 摘要 |
PURPOSE: To provide the continuous speech recognition device which can decrease the calculation quantity of speech recognition by shortening the processing time of phoneme collation and is improved in speech recognition rate as compared with a conventional example. CONSTITUTION: An LR purser 5 is equipped with a memory which stores a phoneme history tree and a state network, expands and generates the phoneme history tree and state network on the basis of detected phonemes inputted from a search part 4 operating in synchronism with frames by referring to context free grammar, stores a sum set of predicted phonemes at respective nodes of the state network in memories at nodes that the phoneme history tree corresponds to, and outputs the sum set of the predicted phonemes to a search part 4. The search part 4 generates a grid hypothesis consisting of an input frame number, the state number of an HMM, predicted phonemes, and the nodes of the phoneme history tree by referring to HMMs on the basis of the sum set of the predicted phonemes from the LR purser 5, calculates the liklihood of the phoneme history tree, and outputs a character string obtained from the phoneme history tree having specific likelihood as a speech recognition result. |
