2チャネルMUSIC法における複数音源方向の逐次的推定に関する検討  [in Japanese] Interative Step by step DOA estimation of multiple sound sources based on MUSIC with two-channel input  [in Japanese]

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Author(s)

Abstract

MUSICに基づく音源方向推定において,頭部伝達関数の影響を受けた2chの受音信号から音声の到来方向を逐次的に推定する方法を提案する.この方法は,音声信号成分の時間-周波数軸上のスパース性を仮定し,既に方向推定した音源に起因する周波数成分の重みを低下させることによって次の音源の方向推定精度を高める.筆者らは,同じ考え方を既提案の重み付きウイナー利得(WWG)に基づいた方向推定[1]において導入しているが,本論文では,よく使われる高分解能法であるMUSIC法にもこの考え方を適用できるように,空間スペクトル上の最大ピークを構成する周波数成分の振幅に基づいて逐次的な処理を行う.さらに,逐次処理から得られる音源方向の候補について,各候補に属する成分パワーの和を計算して音源数を推定する.提案法の性能評価のため,頭部伝達関数を用いて両耳受聴音を模擬し,様々な音源方向からの到来音を想定して音源方向の検出精度を求める計算機シミュレーションを行った.性能評価の結果,音源が3個で各音源の信号対雑音比(S/N)が10dBのとき,コヒーレンスに基づく成分選択を用いた通常のMUSIC法の検出率が約3%であるのに対し,提案法は音源数を既知とした場合が83%,音源数推定も同時に行った場合が78%となり,通常のMUSIC法の性能を大幅に向上できることが確かめられた.

We propose to introduce a step by step processing into MUSIC for estimating both number of sources and directions-of-arrival of multiple speech sources from binaural sound that is processed with a head-related transfer function (HRTF). This method attenuates the frequency components dominated by the already estimated sources to improve the estimation performance of the next targeted source in the step by step procedure. The number of sources (NOS) are also estimated by examining whether each source candidate obtained from the procedure is valid or not. For evaluation, we calculated source detection rate (SDR) assuming various number of sources and many sets of sound source directions by a computer simulation. The simulation results demonstrate that the proposed method outperforms the conventional MUSIC with coherence detection. The SDR with concurrent NOS estimation obtained by the proposed method was about 78% and the SDR with known NOS was about 83% both in the case when three sound sources were present and the signal to background noise ratio (S/N) was 10dB for all the sources while that of the conventional MUSIC with coherence detection with known NOS was about 3%.

Journal

  • IEICE technical report

    IEICE technical report 109(166), 19-24, 2009-07-27

    The Institute of Electronics, Information and Communication Engineers

References:  16

Codes

  • NII Article ID (NAID)
    110007360440
  • NII NACSIS-CAT ID (NCID)
    AN10164817
  • Text Lang
    JPN
  • Article Type
    ART
  • ISSN
    09135685
  • NDL Article ID
    10350069
  • NDL Source Classification
    ZN33(科学技術--電気工学・電気機械工業--電子工学・電気通信)
  • NDL Call No.
    Z16-940
  • Data Source
    CJP  NDL  NII-ELS 
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