A confidence based tree structured decoder for private automatic branch exchange

摘要

High performance voice controlled Private Automatic Branch Exchange (PABX) is a difficult task to achieve, especially when users are not required to follow a rigid speaking format. By incorporating hierarchical confidence measures into a tree structured PABX decoder, the keyword accuracy is increased from 89.86percent to 92.63percent. Further improvement is made by a confidence measure based postprocessor, which rejects 5.68percent of all testing utterances and improves the accuracy to 97.18percent.