| 摘要 |
PROBLEM TO BE SOLVED: To accurately estimate a target signal section without knowing the number of sound sources and an incoming direction of a signal beforehand, even in environment in which directional noise and diffusing noise are included. SOLUTION: Each signal observed at a plurality of sensors is segmented for each frame which is a predetermined time section, a signal of each frame of each segmented sensor is converted to a frequency domain, and a frequency domain signal is generated for each sensor. By using the frequency domain signal corresponding to a reference sensor as a reference, each frequency domain signal corresponding to sensors other than the reference sensor is normalized, and a normalized signal value corresponding to the incoming direction of the signal is generated. A space power distribution value quantized by using the generated normalized signal value is calculated for each incoming direction, and based on temporal change of the statistical nature of the space power distribution value, it is determined whether or not, each frame corresponds to the target signal section. COPYRIGHT: (C)2010,JPO&INPIT |
