Fast computation of the target signal phase in noisy environments

摘要

This paper proposes a fast Fourier transform (FFT) based algorithm to compute the desired signal phase in noisy environments for implementing adaptive directionality of dual microphone application systems such as wireless communications, etc. We will show theoretically and by simulation results that the proposed scheme can compute effectively the target signal phase and can further provide an effective reduction of the noise that comes in different direction from the one of the target signal. We will also discuss in more details this proposed scheme from the practical application and real-time implementation points of view. In comparison with other available methods, the proposed scheme has the following advantages: (1) a simple and realizable implementation structure; (2) the elimination of an additional delay processing unit for endfire orientation microphones; (3) an effective solution of microphone mismatch problem and (4) the elimination of the assumption that the target signal must be exactly straight ahead. With these features, this proposed scheme could provide a new tool to compute the target signal phase and to implement adaptive directionality in related application fields. (c) 2004 Elsevier Inc. All rights reserved.