Patent ID: 8531917

Claim:
An apparatus for estimating a Direction of Arrival (DOA) of wideband signals, the apparatus comprising: first and second signal receiving units, each configured to receive a wideband signal; a DOA calculating unit configured to calculate a DOA (θ) using a normalized frequency ( f ), which is obtained by performing a fast Fourier transformation (FFT) on the respective wideband signals, and a distance between the first and second signal receiving units, wherein the distance satisfies an equation d≦(Mc)/(2f s ), where ‘d’ is the distance between the first and second signal receiving units, ‘c’ is the speed of sound in the environment of the first and second signal receiving units, ‘f s ’ is a sampling frequency of the wideband signals, ‘M’ is a number of FFT points of the wideband signals and satisfies the equation M=f s /f 0 , and ‘f 0 ’ is a fundamental frequency of the wideband signals, and the DOA calculating unit is configured to calculate the DOA (θ) using the normalized frequency ( f ), the distance ‘d’, and the number of FFT points of the wideband signals ‘M’ , where ( f ) is calculated by performing an M-point FFT based on a cross power spectral density (CPSD) ‘P m ’.