US 11,741,939 B2
Headphone with multiple reference microphones ANC and transparency
Hanchi Chen, San Jose, CA (US); Sarthak Khanal, Santa Clara, CA (US); Yang Lu, San Jose, CA (US); Vladan Bajic, San Francisco, CA (US); and Esge B. Andersen, Campbell, CA (US)
Assigned to Apple Inc., Cupertino, CA (US)
Filed by Apple Inc., Cupertino, CA (US)
Filed on Sep. 1, 2022, as Appl. No. 17/901,779.
Application 17/901,779 is a continuation of application No. 17/022,954, filed on Sep. 16, 2020, granted, now 11,437,012.
Prior Publication US 2022/0415303 A1, Dec. 29, 2022
This patent is subject to a terminal disclaimer.
Int. Cl. G10K 11/178 (2006.01); H04R 3/00 (2006.01)
CPC G10K 11/17881 (2018.01) [G10K 11/17854 (2018.01); H04R 3/005 (2013.01); G10K 2210/3028 (2013.01); H04R 2201/10 (2013.01)] 26 Claims
OG exemplary drawing
 
1. A wearable device comprising:
an enclosure having an outside face that is joined to an inside face by and along a perimeter sidewall of the enclosure, wherein the outside face is spaced apart from the inside face by the perimeter sidewall;
a plurality of reference microphones in the enclosure and associated with a plurality of sound inlets, respectively, formed on the perimeter sidewall of the enclosure;
an error microphone in the enclosure, the enclosure having a sound inlet for use by the error microphone, formed on the inside face of the enclosure; and
a processor that is to produce a) audio output for acoustic noise cancellation based on i) one or more of a plurality of reference microphone signals and ii) an error microphone signal, from the plurality of reference microphones and the error microphone, and b) audio output for transparency based on the plurality of reference microphone signals.