Method and device for stereo echo cancelling by filtering in the frequency domain

摘要

The system includes digital sampling within a number of frequency bands. The procedure for annulling stereophonic echo includes application of first and second input signals (x1, x2) to an echo generator, and receiving an observation signal (z) at the output of the system. The signals are digitally sampled and processed in blocks of 2N samples. The process includes determination of the spectral energy of the first and second input signa and determination of the inter-spectral energy of the two signals and a coherence value for each of the frequencies in a range o frequencies. These values are processed by a vector technique, including determination of conjugate complex values.