Signal processing apparatus, signal processing method, and signal processing program

Abstract

A wideband signal is enhanced or suppressed to the same extent at each frequency without increasing the size of an overall sensor array. To achieve this, there is provided a signal processing apparatus including a direction estimator that obtains a direction of arrival of a signal for signals received from a plurality of sensors and each containing a target signal and noise, a first gain calculator that calculates a first gain using the direction of arrival of the signal, an integrator that obtains an integrated signal by integrating the signals received from the plurality of sensors, and a multiplier that multiplies the first gain by the integrated signal.

What is claimed is: 
     
         1 . A signal processing apparatus comprising:
 a direction estimator that obtains a direction of arrival of a signal for signals received from a plurality of sensors and each containing a target signal and noise;   a gain calculator that calculates a gain using the direction of arrival of the signal;   an integrator that obtains an integrated signal by integrating the signals received from the plurality of sensors;   a multiplier that multiplies the gain by the integrated signal; and   a plurality of converters that independently apply conversion to the signals received from the plurality of sensors, and obtain a plurality of converted signals each containing a plurality of frequency components,   wherein said gain calculator calculates the gain proportional to the frequency, and   wherein the same processing is performed at a plurality of frequencies for the plurality of converted signals instead of the signals received from the plurality of sensors.   
     
     
         2 . A signal processing method comprising:
 obtaining a direction of arrival of a signal for signals received from a plurality of sensors and each containing a target signal and noise;   calculating a gain using the direction of arrival of the signal;   obtaining an integrated signal by integrating the signals received from the plurality of sensors;   multiplying the gain by the integrated signal;   independently applying conversion to the signals received from the plurality of sensors, and   obtaining a plurality of converted signals each containing a plurality of frequency components,   wherein the gain proportional to the frequency is calculated, and   wherein the same processing is performed at a plurality of frequencies for the plurality of converted signals instead of the signals received from the plurality of sensors.   
     
     
         3 . A non-transitory computer readable medium storing a signal processing program for causing a computer to execute a method, comprising:
 obtaining a direction of arrival of a signal for signals received from a plurality of sensors and each containing a target signal and noise;   calculating a gain using the direction of arrival of the signal;   obtaining an integrated signal by integrating the signals received from the plurality of sensors; and   multiplying the gain by the integrated signal;   independently applying conversion to the signals received from the plurality of sensors, and   obtaining a plurality of converted signals each containing a plurality of frequency components,   wherein the gain proportional to the frequency is calculated, and   wherein the same processing is performed at a plurality of frequencies for the plurality of converted signals instead of the signals received from the plurality of sensors.