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Computer-Implemented Systems and Methods for Estimating Word Accuracy for Automatic Speech Recognition

Author(s):
Yoon, Su-Youn; Chen, Lei; Zechner, Klaus
Patent Issued:
May 16, 2017
Patent Number:
9,652,999
Source:
ETS Patent
Document Type:
Patent
Family ID:
1000002587624
Subject/Key Words:
Patent, Active Patent, Computer-Implemented, Word Accuracy Rate, Automated Scoring and Natural Language Processing, Non-Native Speakers, Spontaneous Speech, Speech Sample

Abstract

Systems and methods are provided for scoring non-native, spontaneous speech. A spontaneous speech sample is received, where the sample is of spontaneous speech spoken by a non-native speaker. Automatic speech recognition is performed on the sample using an automatic speech recognition system to generate a transcript of the sample, where a speech recognizer metric is determined by the automatic speech recognition system. A word accuracy rate estimate is determined for the transcript of the sample generated by the automatic speech recognition system based on the speech recognizer metric. The spontaneous speech sample is scored using a preferred scoring model when the word accuracy rate estimate satisfies a threshold, and the spontaneous speech sample is scored using an alternate scoring model when the word accuracy rate estimate fails to satisfy the threshold.

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