| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a novel method for obtaining voice originating from a vehicle compartment separating from noise originating from a vehicle exterior, in a technique that it is determined whether an occupant utters on the basis of a comparison between the voice originating from a vehicle interior and an output voice of an on-board acoustic device to reduce a sound volume of the on-board acoustic device when determined that the occupant utters. <P>SOLUTION: The apparatus includes: a vehicle parameter box 4e that corrects a frequency spectrum data of voice originating from the vehicle exterior, on the basis of a vehicle parameter box data indicating a damping factor per frequency for the frequency spectrum data of voice originating from the vehicle exterior in which a microphone 6 for the vehicle exterior has received, to estimate the frequency spectrum data when the voice originating from the vehicle exterior transmits into the vehicle compartment, attenuates, and is received by a microphone 5 for the vehicle interior; a difference detection unit 4f for removing an element of the frequency spectrum data of the voice originating from the vehicle exterior after corrected by the vehicle parameter box 4e from the frequency spectrum data of the voice of the vehicle interior in which the microphone 5 for the vehicle interior has received. <P>COPYRIGHT: (C)2012,JPO&INPIT |
