改進的互功率譜相位時延估計方法
Time Delay Estimation by Using Modified Crosspower Spectrum Phase Technique
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摘要: 互功率譜相位是一種常用的時延估計方法,該方法在弱噪聲和中度以下混響的環(huán)境下,可以獲 得比較精確的時廷估計值;但在低信噪比和強混響的環(huán)境下,該方法的性能急劇下降,針對這一問題,本文 提出了一種改進的互功率譜相位時延估計方法。計算機模擬結果表明,改進后的方法即使在低信噪比和強混 響的環(huán)境下,也可以獲得令人滿意的時延估計值。
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關鍵詞:
- 傳聲器陣列; 互功率譜相位; 時延估計
Abstract: The Crosspower Spectrum Phase (CSP) technique is a well known time delay estimation method. A relatively precise time delay estimation can be achieved by using it in the environment of weak noise and medium reverberation. The performance degrades sharply in the environment of low SNR and strong reverberation. The modified CSP algorithm is proposed in order to improve the performance of CSP. The weighting function of the proposed CSP method changes with the variation of SNR, and the time delay of arrival is accomplished via a weighted function of frames of CSP. Computer simulation results indicate that the proposed method will give satisfactory value of time delay estimation even in the environment of low SNR and strong reverberation. -
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