System and method for suppression of non-linear acoustic echoes

US10477031B2 · kind B2 · utility

Assignee

• Nuance Communications, Inc. · US

Inventors

• Ingo Schalk-Schupp · Ulm, DE
• Markus Buck · Biberach, DE
• Friedrich Faubel · Ulm, DE

Key dates

• Filing date: Dec 8, 2015
• Grant date: Nov 12, 2019
• Expiry date: Dec 8, 2035

Classification

• Technology area (CPC H): Electricity
• CPC primary: H04M2201/40
• WIPO field: Telecommunications
• WIPO sector: Electrical engineering

Abstract

A method for residual echo suppression is provided. Embodiments may include receiving an original reference signal and applying a distortion function to the original reference signal to generate a second signal. Embodiments may include generating a non-linear signal from the distortion function that does not include linear components of the original reference signal. Embodiments may also include calculating a residual echo power of a linear component and a non-linear component, wherein the linear component is based upon the original reference signal and the non-linear component is based upon the non-linear signal. Embodiments may further include applying a room model to each of the original reference signal and the non-linear signal and estimating a power associated with the original reference signal and the non-linear signal. Embodiments may include calculating a combined echo power estimate as a weighted sum of a weighted original reference signal power and a weighted non-linear signal power.