ANC SYSTEM WITH SPL-CONTROLLED OUTPUT

摘要

An anti-noise signal is produced in accordance with an active noise cancellation process (ANC), at an input of a speaker so as to control how much background noise a user can hear. Strength of the anti-noise signal is adjusted gradually, rather than abruptly, in proportion to decreasing or increasing sound pressure level (SPL) of the background noise, during inactivation or activation of the ANC process. Other embodiments are also described and claimed.

主权项

1. A method for active noise cancellation (ANC), comprising:
estimating sound pressure level (SPL) of ambient noise; and one of a) activating an ANC process and b) inactivating the ANC process, gradually, rather than abruptly, based on the estimated ambient noise SPL.