Device for the adaptation of the directional characteristic of microphones for the voice control system

摘要

Voice control systems are employed in a variety of technical fields. In this case, the spoken words is detected, usually by means of one or more microphones (m1, m2), and then to a voice recognition system (rec) is supplied, which from the detected signals determined those words, which have the highest probability. The robustness against acoustic interference influences can be increased by the microphone directly in front of the mouth of the speaker is held fixed or. According to the invention, a voice control system also makes it possible from a greater distance, in that a spatial separation of interfering background noise by means of a use of directional microphones or microphone array (m1, m2) is carried out. An adaptation of the directional characteristic takes place in this case, by providing means for detection of the location of the user (ir1, vr, cir) are provided. For this purpose, one or more infrared motion vector - used.