Equipment and processes for echo suppression with adaptive fir filters

US6483915B1 · kind B1 · utility

Assignee

• ALCATEL · FR

Inventors

• Armin Mann · Sachsenheim, DE
• Hans Jurgen Matt · Waiblingen, DE
• Michael D. Walker · San Francisco, US

Key dates

• Filing date: Jan 15, 1999
• Grant date: Nov 19, 2002
• Expiry date: Jan 15, 2019

Classification

• Technology area (CPC H): Electricity
• CPC primary: H04B3/23
• WIPO field: Telecommunications
• WIPO sector: Electrical engineering

Abstract

An equipment (1) 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 (10), each of which are able to reproduce a whole echo or partial echo, are implemented on a single ASIC (=Application Specific Integrated Circuit) (9) 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 (9) and in which a digital signal processor (4) is designed to control the ASIC (9) and set the filter settings, especially after the coefficient required to reproduce the echo is calculated on the ASIC (9). This calculation is carried out in the digital signal processor (4). 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 …