| 摘要 |
PROBLEM TO BE SOLVED: To provide a noise rejection device capable of removing only noise from an acoustic signal with high accuracy by extracting only non-directional noise from the acoustic signal without getting a directional target sound mixed in it.SOLUTION: A noise rejection device selectively uses an adaptive beam former and a fixed beam former for each frequency. At this time, a null direction for the fixed beam former is determined from a null direction automatically formed by the adaptive beam former. A filter coefficient for the adaptive beam former based on an output power minimization standard is calculated by a minimum norm method in which the norm of the filter coefficient is used as a constraint condition. The selection is performed, for example, on the basis of the depth of null automatically formed by the adaptive beam former in the selection. |
