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

Claim 13:
14. The signal processing device according to claim 7, wherein
the estimation unit includes:
a matrix estimation unit that acquires a weighted modified space-time covariance matrix that is based on the steering vector or the estimated steering vector, the frequency-divided observation signals, and the power or estimated power of the target signals, where the weighted modified space-time covariance matrix is characterized in that when the instantaneous beamformer is represented by a sum of a constant multiple of the steering vector or a constant multiple of the estimated steering vector and a product of a block matrix corresponding to an orthogonal complement of the steering vector or the estimated steering vector and a modified instantaneous beamformer, the weighted modified space-time covariance matrix has signals acquired as a result of multiplying the block matrix by the frequency-divided observation signals of the first time interval as elements; and
a convolutional beamformer estimation unit that acquires the convolutional beamformer based on the steering vector or the estimated steering vector, the weighted modified space-time covariance matrix, and the frequency-divided observation signals.