Directionally constrained minimization of power algorithm for speech signals

A novel algorithm of adaptive beamforming with a microphone array is presented. Beamforming is one of the simplest methods for discriminating between different signals based on the physical location of sources. The directionally constrained minimization of power (DCMP) algorithm is well-known as a reliable approach to extracting some signals incoming from specific directions. In the DCMP algorithm, the output power of the sensor array is minimized under the constraint of a constant response to the direction of arrival (DOA) of the target signal. Although the conventional DCMP is applied only to narrowband signals, our approach extends this algorithm so that the DCMP criterion is applicable to the broadband signals such as speech. The proposed method can be achieved by a relatively small hardware amount of the system.