TOPIC DISCRIMINATOR

摘要

An improved topic discriminator includes an integrated speech recognizer or word and phrase spotter as part of a speech event detector, and a topic classifier (block 16) trained on topic-dependent event frequencies. The event frequencies (block 14) are determined from either or both transcribed data with a text event detector and untranscribed speech data with a speech event detector (block 12). In accordande with another aspect of the present invention, the phrase spotter is used to detect the presence of phrases without the need of parsing the output of a speech recognizer's hypothesized transcription. Finally, in accordance with another aspect of the invention, an improved method of topic modeling (block 20) is used to improve the performance of the topic discriminator.