Providing Ambient Naturalness in ANR Headphones

摘要

In an active noise reducing headphone, a signal processor applies filters and control gains of both the feed-forward and feedback active noise cancellation signal paths. The signal processor is configured to apply first feed-forward filters to the feed-forward signal path and apply first feedback filters to the feedback signal path during a first operating mode providing effective cancellation of ambient sound, and to apply second feed-forward filters to the feed-forward signal path during a second operating mode providing active hear-through of ambient sounds with ambient naturalness.

主权项

1. A computer-implemented method comprising:
receiving a first external audio signal from a microphone of a noise-reducing device; generating a noise-cancellation signal for cancelling the first external audio signal; causing a speaker of the noise-reducing device to generate audio corresponding to the noise-cancellation signal in an active noise reduction (ANR) mode; receiving a second external audio signal from the microphone of the noise-reducing device; determining that at least a first portion of the second external audio signal indicates that the noise-reducing device should transition from the ANR mode to a hear-through mode; transitioning to the hear-through mode, the transitioning comprises facilitating presentation of at least a second portion of the second external audio signal at the noise-reducing device by modifying noise cancellation for at least the second portion of the second external audio signal.