| 摘要 |
PROBLEM TO BE SOLVED: To provide a beam forming processing unit capable of solving a problem of conventional beam forming processing, as the conventional beam forming processing uses a steering vector depending on a transfer characteristic from a speaker to each microphone for suppressing the noise without distorting the audio, and enabling audio collection of high SN ratio, however, it is necessary to measure and hold the steering vector for every vehicle type because of the difference of transfer property as the drive seat position differs from vehicle to vehicle, thus increasing the data amount which costs too much on the data storing media if the number of vehicle types is increasing.SOLUTION: A beam forming processing unit includes: a plurality of microphones for collecting audio signals; a steering vector calculation part for calculating a steering vector depending on angle and distance information from each of the plurality of microphones to a speaker, and microphone characteristic data which can be obtained by measuring a directional pattern and a sensitivity of each of the plurality of microphones in advance; and a beam forming processing part for performing a beam forming processing using the audio signals from the plurality of microphones and the steering vector from the steering vector calculation part. |
