Patent ID: 11894010
Assignee: NIPPON TELEGRAPH AND TELEPHONE CORPORATION
Field: Computer technology (Electrical engineering)
Classification: CPC G  H | IPC G

Claim 6:
7. The signal processing device according to claim 6, wherein
the convolutional beamformer is equivalent to a beamformer acquired by integrating a reverberation suppression filter for suppressing reverberation from the frequency-divided observation signals and an instantaneous beamformer for suppressing noise from signals acquired by applying the reverberation suppression filter to the frequency-divided observation signals,
the instantaneous beamformer calculates a weighted sum of signals of a current time point at each time point, and
the constraint condition is a condition in which a value acquired by applying the instantaneous beamformer to a steering vector having, as an element, transfer functions relating to the direct sound and the initial reflected sound from the sound source to a pickup position of the acoustic signals, or to an estimated steering vector that is an estimated vector of the steering vector, is a constant.