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.

翻译：本研究提出一种鲁棒的单通道逆滤波器，用于非理想录音的去混响处理，并在真实音频数据上进行了验证。所开发方法聚焦于离散冲激响应的计算与修正，旨在滤除已知数字单通道录音系统及房间声学特性（如早期反射与混响）带来的影响。其目标在于实现更干爽、更清晰的信号重构，理想情况下应还原为直达路径信号。时域冲激响应通过倒谱域计算获得，并在频谱中采用频点特定的指数衰减进行淡化处理。衰减率通过盲估计各频点录音输出信号与测试信号的混响时间比值得出。修正后的冲激响应通过反卷积对录制音频信号进行滤波处理。该盲估计方法因其对噪声与非理想条件具有鲁棒性而广受认可。直达路径信号的估计对众多应用场景至关重要。