| 摘要 |
An automated directory assistance ( 130 ) includes a training system ( 210 ). and a directory assistance system ( 220 ). The training system ( 210 ) trains and maintains the directory assistance system ( 220 ). The training system ( 210 ) includes a transcription module ( 310 ), a speech grammar estimation module ( 330 ), a listings statistics estimation module ( 340 ), and a required words determination module ( 350 ). The transcription module ( 310 ) obtains transcripts relating to directory service requests. The speech grammar estimation module ( 330 ) creates an n-gram grammar for multiple telephone numbers from the transcripts. The listings statistics estimation module ( 340 ) identifies words used to refer to each of the telephone numbers from the transcripts. The required words determination module ( 350 ) identifies at least one word that is required to request each of the telephone numbers from the transcripts. The directory assistance system ( 210 ) includes a speech recognition module ( 510 ), a listing retrieval module ( 520 ), and an accept/reject module ( 530 ). The speech recognition module ( 510 ) receives an audible request for a telephone number from a caller and generates a transcript from the audible request. The listing retrieval module ( 520 ) retrieves at least one listing corresponding to the audible request from a database using the transcript. The accept/reject module ( 530 ) determines whether to accept one or more of the listings retrieved by the listing retrieval module ( 520 ) and presents a telephone number corresponding to the accepted listing to the caller.
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