A Dual-Microphone Speech Enhancement Algorithm Based on the Coherence Function.
A Dual-Microphone Speech Enhancement Algorithm Based on the Coherence Function.
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DOI：
10.1109/tasl.2011.2162406
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发表时间：
2011-07-18
期刊：
影响因子：
--
通讯作者：
Loizou PC
中科院分区：
文献类型：
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作者：
Yousefian N;Loizou PC
本文提出了一种新颖的双麦克风语音增强技术。该技术利用目标信号和噪声信号之间的相干性作为降噪标准，并且通常可应用于麦克风间距较小的阵列，在这种阵列中，传感器所采集的噪声具有高度相关性。所提出的算法易于实现，且无需估计噪声统计信息。此外，它具备处理可能位于不同方位的多个干扰源的能力。通过可懂度听力测试，让听力正常的受试者对所提出的算法进行评估，并与一种成熟的波束形成算法进行比较。结果表明，在单噪声源和多噪声源场景下，相对于基准（前置麦克风）算法，语音可懂度都有大幅提高。研究发现，所提出的算法比波束形成算法具有更高的可懂度，尤其是在存在多个噪声源或干扰说话者时。对所提算法的客观质量评估也表明，其质量相比波束形成算法有显著提高。基于相干性的所提算法在可懂度和质量方面的优势使其成为助听器和人工耳蜗设备的一个可行选择。
A novel dual-microphone speech enhancement technique is proposed in the present paper. The technique utilizes the coherence between the target and noise signals as a criterion for noise reduction and can be generally applied to arrays with closely-spaced microphones, where noise captured by the sensors is highly correlated. The proposed algorithm is simple to implement and requires no estimation of noise statistics. In addition, it offers the capability of coping with multiple interfering sources that might be located at different azimuths. The proposed algorithm was evaluated with normal hearing listeners using intelligibility listening tests and compared against a well-established beamforming algorithm. Results indicated large gains in speech intelligibility relative to the baseline (front microphone) algorithm in both single and multiple-noise source scenarios. The proposed algorithm was found to yield substantially higher intelligibility than that obtained by the beamforming algorithm, particularly when multiple noise sources or competing talker(s) were present. Objective quality evaluation of the proposed algorithm also indicated significant quality improvement over that obtained by the beamforming algorithm. The intelligibility and quality benefits observed with the proposed coherence-based algorithm make it a viable candidate for hearing aid and cochlear implant devices.