Zero delay - structure for sub-band - echo compensation, the echo compensation and method for echo compensation

摘要

Zero delay - structure for eliminating delays, which in the case of a sub-band - echo compensation is to be triggered, characterized by:first sub-band - fragmentation means (21), in order to a digital echo signal band moderately into several frequency bands and - downwardly to scan;second sub-band - fragmentation means (17), in order to a digital reference signal in a few frequency bands band moderately and - downwardly to scan;a first lms ® - filter (23), the the digital reference signal, and the broken down, receives digital echo signal, and, in reaction an lms ® - signal is generated, the estimated echo paths for this purpose represents;a direct filter effects (25) is provided enabling the digital reference signal, and the lms ® - signal earlier in time to receive and output, as a result of which the delays, which while a sub-band - echo compensation, and is triggered by a delay due to an initial part of the echo paths differ from one another, are eliminated;Sub-band - reconstruction means (27), in order to direct filter effects (25) from the output signal up - to scan and recombine, as a result of which the digital signals only with a delay due to the initial part of the echo paths are generated;a further lms ® - filter (31), due to the delay..