Inner year type noise reduction earphone

Japanese Patent JP6215428

B2

Apparatus comprising: an earphone for an active noise reduction (ANR) earphone, comprising: structure for engaging an outer ear so that the earphone is positioned and retained in an ear of a user; a nozzle (70) providing a passageway that is adapted to acoustically seal the earphone with an ear canal (75) of the user at the transition between the bowl of a concha of the user and the entrance to the ear canal to form a cavity; ANR circuitry comprising a feedback microphone (11) adapted to be acoustically coupled to the ear canal, for detecting noise in the earphone; feedback circuitry (71) responsive to the feedback microphone for providing a feedback noise cancelling audio signal; and an acoustic driver (17) for transducing an output noise canceling audio signal comprising the feedback noise canceling audio signal to noise canceling acoustic energy ; the nozzle being oriented and shaped to control an acoustic impedance of the nozzle, such that at least one of: a cross sectional area of the nozzle, a ratio of the nozzle length to the nozzle cross sectional area, or an acoustic mass of the nozzle causes an absolute value of the acoustic impedance of the nozzle to be below 8 × 10 5 kg m 4 × sec at 100 Hz and below 8 × 10 6 kg m 4 × sec at 1 kHz.

Kevin P. Annunciato
Jason Harlow
Michael monaghan
Anand Pulsa Salasi
Ryan Sea Silvestri
Eric M Wallace

JP2016187934A

October 18, 2017

September 27, 2016

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BOSE CORPORATION

H04R1/10; H04R3/00

JP2009153103A
JP2009516409A
JP2101697U
JP60040187U

WO2010005039A1
WO2009041012A1

Yasuhiko Murayama
Shinya Mitsuhiro
Tatsuhiko Abe

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