Equipment and processes for echo suppression with adaptive fir filters

Abstract

An equipment ( ) for the suppression of whole echoes composed of several partial echoes in telecommunications (TC) equipment, such as end devices, transmission systems or exchange equipment, with the help of adaptive FIR (=Finite Impulse Response) filters, which reproduce the whole echo and extract it from the echo-laden useful signal and which has been transferred to the respective TC equipment, in which the homogeneous FIR filters or partial filters ( ), each of which are able to reproduce a whole echo or partial echo, are implemented on a single ASIC (=Application Specific Integrated Circuit) ( ) for the m parallel and independent TC channels n to be served; and in which the whole echoes or partial echoes to be reproduced can be calculated in real time in the ASIC ( ) and in which a digital signal processor ( ) is designed to control the ASIC ( ) and set the filter settings, especially after the coefficient required to reproduce the echo is calculated on the ASIC ( ). This calculation is carried out in the digital signal processor ( ). This makes it possible to effectively suppress echoes in a large number of m parallel and independent TC channels, as they must be processed in exchanges and network hybrids, without requiring a large amount of memory space and computational effort.