Inter-Channel Decorrelation by Resampling via Time-Domain Interpolation Filters Derived from the Time-Shifting Property

Inhalt:
We have shown previously that decorrelation by resampling (DBR) effectively alleviates the non-uniqueness problem caused by highly correlated reference signals during multi-channel acoustic echo cancellation. We present in this paper a novel DBR procedure for inter-channel decorrelation by using the time-domain interpolation filters derived from the time-shifting property that appears in frequency-domain resampling (FDR) through the discrete Fourier transform. By pre-computing a set of interpolation filters, DBR can be performed efficiently in real time in the time domain. Moreover, the block-processing artifacts can be completely eliminated through center filtering by the proposed method. Simulation results show that the new approach has higher resampling accuracy compared to the original FDR scheme. Index Terms — Resampling, interpolation filter, inter-channel decorrelation, time shifting, multi-channel acoustic echo cancellation