US 12,069,426 B1
Audio devices augmented with acoustic metamaterials
Chuming Zhao, Redmond, WA (US); Morteza Khaleghimeybodi, Bothell, WA (US); Nils Thomas Fritiof Lunner, Redmond, WA (US); Calvin Bernard Shaw, Milpitas, CA (US); Yun Zhou, Redmond, WA (US); and Xiaochu Yao, San Jose, CA (US)
Assigned to META PLATFORMS TECHNOLOGIES, LLC, Menlo Park, CA (US)
Filed by META PLATFORMS TECHNOLOGIES, LLC, Menlo Park, CA (US)
Filed on May 6, 2022, as Appl. No. 17/738,971.
Claims priority of provisional application 63/188,025, filed on May 13, 2021.
Int. Cl. H04R 1/28 (2006.01); H04R 1/02 (2006.01); H04R 1/10 (2006.01)
CPC H04R 1/2826 (2013.01) [H04R 1/028 (2013.01); H04R 1/1008 (2013.01); H04R 2499/15 (2013.01)] 18 Claims
OG exemplary drawing
 
1. An audio device comprising:
a transducer configured to emit sound; and
an enclosure containing the transducer and forming a front volume and a rear volume on opposite sides of the transducer, wherein the enclosure includes:
an output port configured to output audio from the front volume that is generated by the transducer;
a plurality of closed channels formed within the rear volume, and the plurality of closed channels together forming an acoustic metamaterial configured to virtually increase the rear volume, to amplify a bass portion of the sound to form audio content,
wherein:
the plurality of closed channels are configured to attenuate one or more selected resonance frequencies, at least in part due to the plurality of closed channels being dimensioned to provide impedance matching between the rear volume and the front volume over the one or more selected resonance frequencies; and
the audio content is presented to a user.