Patent ID: 9020160
Filing Date: 2015-04-28
Classification: G10K,H04R

Abstract:
1. An active noise reducing headphone comprising: an ear piece configured to couple to a wearer's ear to define an acoustic volume comprising the volume of air within the wearer's ear canal and a volume within the ear piece; a feedback microphone acoustically coupled to the acoustic volume and electrically coupled to a feedback active noise cancellation signal path; a feed-forward microphone acoustically coupled to an external environment and electrically coupled to a feed-forward active noise cancellation signal path; an output transducer acoustically coupled to the acoustic volume via the first volume and electrically coupled to the feedback signal path and the feed-forward signal path; and a signal processor configured to apply filters and control gains of the feedback signal path and the feed-forward signal path; wherein the signal processor is configured to: the first gain level being a level of gain that results in effective cancellation of sounds transmitted through or around the ear piece and through the user's head into the acoustic volume when the ear piece is coupled to the wearer's ear, the second level being a level of gain that is matched to the level of sound of a typical wearer's voice transmitted through the wearer's head when the ear piece is coupled to the wearer's ear, and the second feedback filters and the second feed-forward filters are selected to provide active hear-through of a user's own voice with self-naturalness.