US 12,300,213 B2
Noise control
Peter Knight Reid, Swindon (GB); and Philip Stephen Darling, Bristol (GB)
Assigned to Dyson Technology Limited, Wiltshire (GB)
Appl. No. 17/418,184
Filed by Dyson Technology Limited, Wiltshire (GB)
PCT Filed Dec. 17, 2019, PCT No. PCT/GB2019/053575
§ 371(c)(1), (2) Date Jun. 24, 2021,
PCT Pub. No. WO2020/157447, PCT Pub. Date Aug. 6, 2020.
Claims priority of application No. 1901349 (GB), filed on Jan. 31, 2019.
Prior Publication US 2022/0148557 A1, May 12, 2022
Int. Cl. G10K 11/178 (2006.01); A61F 11/14 (2006.01); A62B 18/00 (2006.01); B01D 46/00 (2022.01); B01D 46/44 (2006.01); H04R 1/10 (2006.01)
CPC G10K 11/17854 (2018.01) [A61F 11/145 (2022.01); A62B 18/003 (2013.01); B01D 46/0043 (2013.01); B01D 46/44 (2013.01); G10K 11/17823 (2018.01); G10K 11/17825 (2018.01); G10K 11/17881 (2018.01); H04R 1/1008 (2013.01); H04R 1/1075 (2013.01); B01D 2273/30 (2013.01); G10K 2210/1081 (2013.01); G10K 2210/3026 (2013.01); G10K 2210/3027 (2013.01); G10K 2210/3028 (2013.01); H04R 2460/01 (2013.01)] 20 Claims
OG exemplary drawing
 
1. An ear cup comprising:
a housing;
an ear pad attached to the housing and arranged such that the housing and the ear pad together define a cavity having an opening;
an acoustic driver disposed within the cavity;
a feedforward microphone carried by the housing and acoustically coupled to the environment external to the housing;
a feedback microphone disposed within the cavity;
a motor-driven impeller interposed between the feedforward microphone and the feedback microphone, the motor-driven impeller configured to generate an airflow through the housing; and
active noise control (ANC) circuitry that is configured to use measurements provided by the feedforward microphone to operate the acoustic driver to attenuate noise having frequencies within a feedforward ANC range having a lower limit and an upper limit such that the lower limit of the feedforward ANC range is approximately 500 Hz and the upper limit is approximately 2 kHz, and to use measurements provided by the feedback microphone to operate the acoustic driver to attenuate noise having frequencies within a feedback ANC range having an upper limit of no more than 500 Hz, wherein the feedback ANC range is configured to attenuate noise at a fundamental frequency of the motor-driven impeller, and the feedforward ANC range is configured to attenuate noise at a 6th harmonic frequency of the motor-driven impeller.