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首页> 外文会议>European Signal Processing Conference(EUSIPCO 2005); 20050904-08; Antalya(TK) >LOW-RESOURCE DELAYLESS SUBBAND ADAPTIVE FILTER USING WEIGHTED OVERLAP-ADD
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LOW-RESOURCE DELAYLESS SUBBAND ADAPTIVE FILTER USING WEIGHTED OVERLAP-ADD

机译：加权重叠叠加的低资源延迟子带自适应滤波器

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摘要

A delayless structure targeted for low-resource implementation is proposed to eliminate filterbank processing delays in subband adaptive filters (SAFs). Rather than using direct IFFT or polyphase fil-terbanks to transform the SAFs back into the time-domain, the proposed method utilizes a weighted overlap-add (WOLA) synthesis. Low-resource real-time implementations are targeted and as such do not involve long (as long as the echo plant) FFT or IFFT operations. Also, the proposed approach facilitates time distribution of the adaptive filter reconstruction calculations crucial for efficient real-time and hardware implementation. The method is implemented on an oversampled WOLA filterbank employed as part of an echo cancellation application. Evaluation results demonstrate that the proposed implementation outperforms conventional SAF systems since the signals used in actual adaptive filtering are not distorted by filter-bank aliasing. The method is a good match for partial update adaptive algorithms since segments of the time-domain adaptive filter are sequentially reconstructed and updated.
机译：提出了一种针对低资源实现的无延迟结构，以消除子带自适应滤波器（SAF）中的滤波器组处理延迟。该方法不是使用直接IFFT或多相滤波器将SAF转换回时域，而是利用加权重叠相加（WOLA）合成。低资源实时实现是有针对性的，因此不涉及较长的（只要是回波工厂）FFT或IFFT操作。同样，提出的方法有助于自适应滤波器重构计算的时间分布，这对于有效的实时和硬件实现至关重要。该方法在作为回声消除应用程序一部分使用的过采样WOLA滤波器组上实现。评估结果表明，由于在实际自适应滤波中使用的信号不会因滤波器组混叠而失真，因此所提出的实现方案优于传统的SAF系统。该方法对于部分更新自适应算法是很好的匹配，因为时域自适应滤波器的各段被顺序地重建和更新。

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