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

Claim 10:
11. The signal processing device according to claim 7, wherein
the frequency-divided reverberation-suppressed signals are time series signals,
the signal processing device further comprises processing circuitry configured to implement:
an observation signal covariance matrix updating unit that acquires a spatial covariance matrix of the frequency-divided observation signals belonging to a first time interval, the spatial covariance matrix being based on the frequency-divided observation signals belonging to the first time interval and a spatial covariance matrix of the frequency-divided observation signals belonging to a second time interval that is further in the past than the first time interval;
a main component vector updating unit that acquires, on the basis of an inverse matrix of a noise covariance matrix of the frequency-divided observation signals, a spatial covariance matrix of the frequency-divided observation signals belonging to the first time interval, and a main component vector of the second time interval, a main component vector of the first time interval relative to a product of the inverse matrix of the noise covariance matrix of the frequency-divided observation signals and the spatial covariance matrix of the frequency-divided observation signals belonging to the first time interval; and
a steering vector estimation unit that acquires and outputs the estimated steering vector of the first time interval on the basis of the main component vector of the first time interval and the noise covariance matrix of the frequency-divided observation signals.