Spoken term detection apparatus, method, program, and storage medium

A spoken term detection method of retrieving speech data including an accepted keyword using an acoustic model holding a characteristic in an acoustic feature space for each stored recognition unit, comprising:

• extracting an acoustic feature from the accumulated speech data;
• storing an extracted acoustic feature in an acoustic features storing device;
• calculating a similarity between a stored acoustic feature and an acoustic feature defined by a stored acoustic model;
• storing a calculated similarity;
• accepting a keyword;
• calculating a score of a keyword by comparing an acoustic model corresponding to the keyword with the acoustic feature stored in the acoustic features storing device;
• a score for a calculated score obtained by calculating a score of the keyword by comparing with the acoustic feature stored in the acoustic features storing device;
• and
• executing a process for retrieving speech data including the keyword from speech data accumulated in an accumulation device, based on a calculated score of the keyword and the stored similarity.

A computer-readable storage medium storing a program to be executed by a computer, wherein

• the program is a program to be executed by a computer in which speech data is accumulated by an accumulation device and an acoustic model retaining a characteristic in an acoustic feature space for each recognition unit is stored in an acoustic features storing device, and the program allows the computer to execute:
• an extraction process for extracting an acoustic feature from the accumulated speech data;
• a first calculation process for calculating a similarity between the extracted acoustic feature and an acoustic feature defined by the stored acoustic model;
• a second calculation process for comparing an acoustic model corresponding with the acoustic feature stored in the acoustic features storing device to calculate an accepted keyword to calculate a score of the keyword;
• and
• a retrieval process for retrieving speech data including the keyword from speech data accumulated in the accumulation device based on the score of the keyword calculated by the second calculation process and the calculated similarity.