2009 Volume 129 Issue 1 Pages 87-93
In this paper, we present a realtime implementation of target sound extraction operating in a frequency domain using microphone array and its performance evaluation in actual room environments. In the realized system, the target sound extraction can be achieved by using the FDGSC (Frequency Domain Generalized Sidelobe Canceller) which is one of GSCs. At each the frequency band, the FDGSC is composed of a fixed beamformer part for target sound enhancement and an adaptive filter part for noisy sound reduction. Since the FDGSC is required to perform at every sound data block to apply the DFT (Discrete Fourier Transform), a processing for a series of block data must be completed within a transfer time of block data in the realtime system. Then, we implement the FDGSC using a general purpose DSP (Digital Signal Processor) evaluation board which enable us to perform a high speed signal processing. A superior performance of realtime processing and target sound extraction are shown by several experimental results in the actual room environments.