Multi-channel echo compensation system

US8085947B2 · kind B2 · utility

Assignee

• Nuance Communications, Inc. · US

Inventors

• Tim Haulick · Blaubeuren, DE
• Gerhard Uwe Schmidt · Ulm, DE
• Markus Buck · Biberach, DE
• Martin Roessler · Ulm, DE
• Hans-Joerg Koepf · Amstetten, DE

Key dates

• Filing date: Apr 25, 2007
• Grant date: Dec 27, 2011
• Expiry date: Oct 26, 2030

Classification

• Technology area (CPC H): Electricity
• CPC primary: H04M9/082
• WIPO field: Telecommunications
• WIPO sector: Electrical engineering

Abstract

A system reduces echoes in an audio system by de-correlating audio signals. Adaptive filters provide compensation based on the de-correlated signals. A controller controls the de-correlation based upon the adaptation state of the adaptive filters.