通过频段特异性衰减反卷积，从真实录音中还原清晰直达声
Dereverberation Filter by Deconvolution with Frequency Bin Specific Faded Impulse Response
- 在频段级别用指数衰减建模混响脉冲响应
- 利用盲估计的混响时间比确定各频段衰减速率
- 适合语音增强、会议录音等需要直达声还原场景
本文提出一种鲁棒的单通道逆滤波方法，用于非理想录音的去混响处理，已在真实音频数据上验证。该方法聚焦于计算并修改离散脉冲响应，以滤除已知单通道录音设置及房间特性（如早期反射和混响）的影响。目标是重建更干、更清晰的信号，理想情况下即为直达路径信号。时域脉冲响应由倒谱域计算得到，并通过频段特定的指数衰减在频谱中实现淡化。各频段的衰减速率通过记录输出与测试信号之间的盲估混响时间比获得。经过修改的脉冲响应通过反卷积对录音信号进行滤波。盲估计方法以对噪声和非理想条件的强鲁棒性著称。直达路径信号的估计对诸多应用至关重要。
原文摘要 · Abstract (English)
This work introduces a robust single-channel inverse filter for dereverberation of non-ideal recordings, validated on real audio. The developed method focuses on the calculation and modification of a discrete impulse response in order to filter the characteristics from a known digital single channel recording setup and room characteristics such as early reflections and reverberations. The aim is a dryer and clearer signal reconstruction, which ideally would be the direct-path signal. The time domain impulse response is calculated from the cepstral domain and faded by means of frequency bin specific exponential decay in the spectrum. The decay rates are obtained by using the blind estimates of reverberation time ratio between recorded output and test signals for each frequency bin. The modified impulse response does filter a recorded audio-signal by deconvolution. The blind estimation is well known and stands out for its robustness to noise and non-idealities. Estimation of a direct path signal is key to many applications.
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