SIGNAL PROCESSING DEVICE AND SIGNAL PROCESSING METHOD

摘要

A signal processing device includes a noise analysis unit for analyzing a frequency component of a noise signal obtained by converting a collected sound into an electrical signal, a plurality of filtering units for carrying out predetermined filtering operations on the noise signal on the basis of an analysis result, and an output control unit for temporally varying a synthesis rate of outputs of the plurality of filtering units according to a change in the analysis result of the noise analysis unit. When the analysis result of the noise analysis unit changes, one filtering unit starts a predetermined filtering operation by characteristics different from those of other filtering units that carry out predetermined filtering operations on the noise signal according to the change in the analysis result of the noise analysis unit.

主权项

1. Headphones having a plurality of noise cancelling modes, comprising:
a housing; a microphone; a noise analysis unit for analyzing a frequency component of a noise signal obtained by converting a collected sound into an electrical signal; a plurality of filtering units for carrying out predetermined filtering operations on the noise signal on the basis of an analysis result of the noise analysis unit; and an output control unit for temporally varying and outputting a synthesis rate of outputs of the plurality of filtering units according to a change in the analysis result of the noise analysis unit, wherein one filtering unit starts a predetermined filtering operation corresponding to a noise cancelling mode different from those of other filtering units that carry out predetermined filtering operations on the noise signal according to the change in the analysis result of the noise analysis unit, and the output control unit temporally varies the synthesis rate of the outputs of the other filtering units and the one filtering unit according to the change in the analysis result of the noise analysis unit and performs switching from the output of the other filtering units to the output of the one filtering unit, and wherein one of the noise cancelling modes is optimized for a noise of an inside of an airplane.