Motor-vehicle voice-control system and microphone-selecting method therefor
First Claim
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, andselecting 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.
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Abstract
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.
19 Citations
10 Claims
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1. A voice-control system for motor vehicles, the system comprising:
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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. - View Dependent Claims (2, 3)
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4. A method for selecting a microphone from spaced-apart first, second, and third microphones provided in a motor vehicle of a voice-control system for operating same, the method comprising the steps of:
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assembling a first correlation pairs from the signals of the first and second microphones and a second correlation pair from the signals of the second and third microphones, calculating respective first and second correlation coefficients for the first and second correlation pairs, detecting an energy value for each microphone, detecting a respective delay time of a voice signal between a voice signal source and each of the microphones, and selecting, depending on the current correlation coefficients of the correlation pairs, on the current energy values of the microphones, and on the current delay times of the voice signal to the microphones that microphone whose signal is currently optimal as a basis for the operation of the voice-control system. - View Dependent Claims (5, 6, 7, 8, 9, 10)
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Specification