A new cross-domain approach to synchronized adaptive echo cancellation and echo postfiltering

Most acoustic echo cancellation systems are based upon an adaptive filter followed by echo postfiltering. Although the two modules have complementary functionalities, they generally operate independently. Existing approaches to synchronized echo control are somewhat limited by the need for both modules to function in the same subband or frequency domain. This paper presents our first attempt at synchronized time-domain adaptive filtering and frequency-domain echo postfiltering. The new synchronization approach exploits the relationship between the system distance in the time domain and the system mismatch power spectrum. Together with a new system distance measurement, the proposed synchronous echo control system is shown to perform well in comparison to existing state of the art approaches.