Implementation of target sound extraction system in frequency domain and its performance evaluation in actual room environments

• Published in: Electronics and communications in Japan 2011-07, Vol.94 (7), p.9-16
• Main Authors: Kousaka, Masanori, Suyama, Kenji
• Format: Article
• Language: English
• Subjects: DSP; microphone array; target sound extraction
• ISSN: 1942-9533; 1942-9541
• DOI: 10.1002/ecj.10334

In this paper, we present a real‐time implementation of target sound extraction operating in a frequency domain using a microphone array, and describe 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 Canceler) which is one of GSCS. In each 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 apply the DFT (Discrete Fourier Transform) in every sound data block, the processing for a series of block data must be completed within the transfer time of block data in the real‐time system. Thus, we implemented the FDGSC using a general‐purpose DSP (Digital Signal Processor) evaluation board which enabled us to perform high‐speed signal processing. Superior performance of real‐time processing and target sound extraction are shown by several experimental results in real room environments. © 2011 Wiley Periodicals, Inc. Electron Comm Jpn, 94(7): 9–16, 2011; Published online in Wiley Online Library (wileyonlinelibrary.com). DOI 10.1002/ecj.10334