Patent Number: 8,718,291

Title: ANC for BT headphones

Abstract: An active noise cancellation controller for performing noise attenuation in a system over a predetermined frequency rang. The controller comprises several components: a first input for a reference signal indicative of a noise level; a second input for receiving an error signal indicative of a remnant noise level; an output for providing a noise cancellation signal; a fixed feedback controller for processing the error signal; a fixed feed-forward controller for processing the reference signal; and an adaptive feed-forward controller having a digital adaptive finite impulse response filter arranged for operation on the reference signal the error signal.

Inventors: Alves; Rogerio Guedes (Macomb Township, MI), Zuluaga; Walter (Rochester Hills, MI)

Assignee: Cambridge Silicon Radio Limited

International Classification: A61F 11/06 (20060101)

Expiration Date: 5/06/12018