Speech dialog system users often times issue their commands before or during push-to-speak (PTS) button use. This leads to degraded system performance already in the first turn. The authors propose a system called talk-and-push (TAP) that allows the user to start talking before or after pushing the PTS button, as is common when tapping on someone's shoulder. An acoustic echo cancellation optimized for in-car use reduces FM radio echoes, so that no muting of the FM radio signal is necessary. A notch filter to remove the beep, buffering of the speech signal, and an intelligent noise robust voice activity detection that signals the start of utterance to the automatic speech recognizer are further core components of the authors' proposed system. Significant word error rate improvements vs. state of the art with muted FM radio signals are reported.


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    Multiple-source speech dialog input

    SALEEM SHIRIN / PIERCY AIMEE THERESE / TYPRIN MARCELLO et al. | European Patent Office | 2017

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