Patent ID: 9299360
Filing Date: 2016-03-29
CPC Classification: G10L,H04R

Claim Text:
1. A speech processing apparatus located in a vehicle comprising: a first microphone configured to input, from a sound space in the vehicle, a first mixture sound including desired speech uttered by an occupant in the vehicle and noise in the vehicle at a first ratio of the noise to the desired speech, and to output a first mixture signal; a second microphone opened to said sound space in the vehicle and configured to be disposed at a focus position of an interface, said interface being one of a windshield and a rear window of the vehicle as part of a boundary of the sound space and having one of a quadratic surface shape and a pseudo surface shape as an aggregate of planes extending in tangential directions of a quadratic surface for collecting the noise in the vehicle at the focus position, the second microphone being configured to input a second mixture sound at the focus position including the desired speech uttered by the occupant in the vehicle and the noise in the vehicle reflected by the interface, at a second ratio of the reflected noise to the desired speech different from the first ratio, and to output a second mixture signal; and a noise suppression circuit configured to suppress an estimated noise signal based on the first mixture signal and the second mixture signal, and to output a pseudo speech signal, wherein said first microphone is disposed at a position farther from the interface than the focus position and nearer to the occupant uttering the desired speech than said second microphone, so that the second ratio is larger than the first ratio.