Techniques for improving telephone audio quality

US7433462B2 · kind B2 · utility

Assignee

• Plantronics, Inc. · US

Inventors

• Richard Hodges · Tampa, US
• David Roberts · Ottawa, CA
• Keith A. McMillen · Berkeley, US
• Leif Claesson · Oakland, US
• Sreevathsa G. Sreenivasa Reddy · Corona, US
• Keith Edwards · Antioch, US

Key dates

• Filing date: Oct 28, 2003
• Grant date: Oct 7, 2008
• Expiry date: Oct 28, 2023

Classification

• Technology area (CPC H): Electricity
• CPC primary: H04B3/20
• WIPO field: Telecommunications
• WIPO sector: Electrical engineering

Abstract

Methods and apparatus are described for use with a near-end telephone. The near-end telephone is operable to generate an outgoing signal directed to a far-end telephone and to receive an incoming signal generated at least in part by the far-end telephone. A first signal processor is operable to dynamically adjust a first signal level associated with the outgoing signal with reference to the first signal level. A second signal processor is operable to dynamically adjust a second signal level associated with the incoming signal with reference to the second signal level. The first and second signal processors are further operable to control a loop gain to inhibit loop instability.