Active noise reducing

US5293425A · kind A · utility

Assignee

• Massachusetts Institute of Technology · US

Inventors

• Alan V. Oppenheim · Lexington, US
• Ehud Weinstein · Ramat Gan, IL
• Kambiz Zangi · Durham, US
• Meir Feder · Modiin-Maccabim-Reut, IL

Key dates

• Filing date: Dec 3, 1991
• Grant date: Mar 8, 1994
• Expiry date: Dec 3, 2011

Classification

• Technology area (CPC G): Physics
• CPC primary: G10K2210/3055
• WIPO field: Other consumer goods
• WIPO sector: Other fields

Abstract

A noise reducing system includes an input transducer that energizes an adaptive filter. The adaptive filter energizes an output transducer that creates a noise reducing field at the input transducer.