Search

This paper describes a method that realizes wide-band beamforming efficiently. In the proposed method, the band-division processing is applied where the signal received from the array sensor is divided into the low- and high-frequency components and the fan-filter with the wedge-shaped transition region and an adequate order is applied to each of the divided bands. The mid-point of the bend is defined as the stopband edge of the lower band filter for dividing the band so that one-half low- speed processing is applied to the lower band and the lower-band fan filter is realized by a lower order. The upper-band fan filter is designed efficiently by including the high-pass filter for the band division. A design example is presented, and it is shown that both the computational complexity and the number of sensors are considerably reduced compared to the case of the direct design. In other words, it is shown that the band division is effective. [ABSTRACT FROM AUTHOR]