Mitigation of echo in voice communication using echo detection and adaptive non-linear processor

US8750491B2 · kind B2 · utility

Assignee

• Microsoft Corporation · US

Inventors

• Vinod Prakash · Redmond, US
• Chao He · Tayport, GB

Key dates

• Filing date: Mar 24, 2009
• Grant date: Jun 10, 2014
• Expiry date: Jan 7, 2032

Classification

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

Abstract

Architecture that mitigates echo in voice communications using echo detection and adaptive management of attenuation by a non-linear processor (NLP). Suppression values provided by the NLP are determined based on echo detection and retained on a case-by-case basis to automatically increase or decrease the attenuation as needed. Feedback is incorporated that where the controls for the NLP attenuation is given by the amount of echo that remains, and this in turn affects the amount of echo that remains.