Motor-vehicle voice-control system and microphone-selecting method therefor

摘要

A voice-control system for motor vehicles has a plurality of spaced microphones emitting respective microphone signals, and an evaluation unit connected to the microphones. This unit serves for assembling correlation pairs from the signals of two of the microphones, calculating a correlation coefficient for each correlation pair, detecting an energy value for each microphone, detecting a respective delay time of a voice signal between a voice signal source and the each of the microphones, and selecting in dependence on current correlation coefficients of the correlation pairs, on the current energy values of the microphones, and on the current delay time of the voice signal to the microphones, that microphone whose signal is optimal as a basis for the operation of the voice-control system.

主权项

1. A voice-control system for motor vehicles, the system comprising:
a first microphone, a second, and a third microphone spaced from each other and emitting respective microphone signals; and an evaluation unit connected to the microphones for: assembling a first correlation pair from the signals of the first microphone and of the second microphone and a second correlation pair from the signals of the second microphone and of the third microphone, calculating a respective correlation coefficient for the first and the second correlation pairs, detecting an energy value for each of the microphones, detecting a respective delay time of a voice signal between a voice signal source and each of the three microphones, calculating a delay time difference between the delay time of the voice signal from the voice signal source to the second microphone and to the first microphone for the first correlation pair and a delay time difference between the delay time of the voice signal from the voice signal source to the third microphone and to the second microphone for the second correlation pair, and selecting in dependence on current correlation coefficients of the correlation pairs, on the current energy values of the microphones, and on the current delay time of the voice signal to the microphones, that microphone whose signal is optimal as a basis for the operation of the voice-control system.