Dialogue speech recognition system, dialogue speech recognition method, and recording medium for storing dialogue speech recognition program

A dialogue speech recognition method comprising:

• upon receiving a speech signal of each speaker in a dialog among a plurality of speakers and turn information indicating whether a speaker having generated the speech signal has turn to speak or indicating a probability that the speaker has turn to speak, performing, by at least one central speech recognition for the speech signal;
• at time of the speech recognition,
• performing acoustic likelihood computation that provides a likelihood of occurrence of an input speech signal from a given phoneme sequence;
• performing linguistic likelihood computation that provides a likelihood of occurrence of a given word sequence;
• performing maximum likelihood candidate search that provides a word sequence with a maximum likelihood of occurrence from a speech signal by using the likelihoods provided by the acoustic likelihood computation and the linguistic likelihood computation;
• and
• at time of the linguistic likelihood computation, providing different linguistic likelihoods when a speaker having generated an input speech signal has the turn to speak and when not.

A non-transitory computer readable storage medium for storing a dialogue speech recognition program that causes a computer to execute speech recognition processing that, upon receiving a speech signal of each speaker in a dialog among a plurality of speakers and turn information indicating whether a speaker having generated the speech signal has turn to speak or indicating a probability that the speaker has turn to speak, performs speech recognition for the speech signal, wherein

• the speech recognition processing at least includes:
• acoustic likelihood computation processing that provides a likelihood of occurrence of an input speech signal from a given phoneme sequence;
• linguistic likelihood computation processing that provides a likelihood of occurrence of a given word sequence;
• and
• maximum likelihood candidate search processing that provides a word sequence with a maximum likelihood of occurrence from a speech signal by using the likelihoods provided by the acoustic likelihood computation processing and the linguistic likelihood computation processing, and
• the linguistic likelihood computation processing provides different linguistic likelihoods when a speaker having generated the speech signal input to the speech recognition unit has the turn to speak and when not.