Voice recognition device and navigation device

摘要

A voice recognition device includes a vehicle state detecting unit for detecting a vehicle state of a vehicle having the voice recognition device mounted thereon, and an acoustic data matching unit for matching an acoustic feature value converted by a sound analyzing unit with a recognition dictionary stored in a recognition dictionary storage unit to recognize a voice input to a microphone. The device also includes a recognition parameter setting unit for setting a recognition parameter at the time when the voice input to the microphone is recognized, and a control unit for instructing the recognition parameter setting unit to change the recognition parameter when the vehicle state detected by the vehicle state detecting unit satisfies a predetermined condition.

主权项

1. A voice recognition device comprising:
a sound collecting unit for acquiring an input voice; a voice processing unit for processing the voice acquired by the sound collecting unit into a digital signal; a sound analyzing unit for sound-analyzing the voice signal processed by the voice processing unit to convert an acoustic feature into an acoustic feature value indicated in time series; a recognition dictionary describing a correspondence between the acoustic feature value converted by the sound analyzing unit and recognition vocabulary; and an acoustic matching unit for matching the acoustic feature value with the recognition dictionary to recognize the voice that is input to the sound collecting unit, the device further comprising: a vehicle state detecting unit for detecting a vehicle state of a vehicle having the voice recognition device mounted thereon; an audio output detecting unit for detecting a volume of a voice signal that is output from an audio device installed within the vehicle; a gain setting unit for setting a voice acquisition gain of the sound collecting unit; a recognition parameter setting unit for setting a recognition parameter at the time when the acoustic matching unit recognizes the voice input to the sound collecting unit; and a control unit for determining whether the vehicle is in a steady operation state or an abnormal operation state based on at least one of the vehicle state detected by the vehicle state detecting unit and the volume detected by the audio output detecting unit, and instructing the recognition parameter setting unit to set the recognition parameter in accordance with whichever of the steady operation state and the abnormal operation state is determined, wherein the recognition parameter comprises at least one of:
a voice power detection threshold by which is detected a start of the voice input being recognized,a time out time for detecting an end of the voice input being recognized,a maximum number of words retained from the voice input being recognized, anda voice acquisition gain of the sound collecting unit when acquiring the voice input being recognized.