G - Physics – 10 – L
Patent
G - Physics
10
L
G10L 15/26 (2006.01) B60R 16/02 (2006.01) H04R 3/00 (2006.01) G10L 21/02 (2006.01)
Patent
CA 2049173
This invention relates to a speech recognition apparatus used in a vehicle. The speech recognition apparatus includes microphones, a speech recognition means for recognizing a voice command from the microphones, an in-phase component detecting means for detecting an in-phase component of voice signals from the microphones positioned symmetrically with respect to a driving seat, to obtain a command generated at the driving seat, a phase shift and in-phase component detecting means for detecting an in-phase component after shifting a certain amount of a voice signal phase from the microphones positioned asymmetrically with respect to passenger seats, to thereby obtain the same phase shifts and a command generated at the passenger seats, a command seat discriminating means for comparing an output level of the in-phase component detecting and the phase shift and in-phase component detecting means to discriminate at which seat a command is generated among several seats, a detecting means for detecting a validity and invalidity of commands resulting from speech obtained from outputs of the speech recognition means and command seat discriminating means to thereby control various equipment. Also, the plurality of microphones are separated from each other to input voice commands generated at each seat in the vehicle, and the speech recognition apparatus comprises a phase shift means for shifting a predetermined amount of phases of electric signals through the microphones with the same phase shift relative to each seat, an adding means for adding output signals of the phase shift means corresponding to each seat, a maximum amplitude signal detecting means for detecting a maximum amplitude signal of output signals of each adding means as voice commands and outputting same to the speech recognition means. Therefore, commands from the driver seat and the passenger seats are discriminated with a high reliability and the speech recognition rate in a noisy vehicle room is enhanced.
Fujimoto Shoji
Sako Kazuya
Takahashi Minoru
Fujitsu Ten Limited
Mcfadden Fincham
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