公开(公告)号：US10904667B1

公开(公告)日：2021-01-26

申请号：US15925511

申请日：2018-03-19

Applicant: AMAZON TECHNOLOGIES, INC.

Inventor： Xuan Zhong ,  Yuna Hu ,  Chun Sik Jeong ,  Zhen Xu ,  Jung Sik Yang ,  Shahram Talakoub ,  Jianchun Dong

IPC: H04R5/033 ,  H04R5/04 ,  G02C11/00

Abstract: A head-mounted wearable device (HMWD) with a form factor of eyeglasses incorporates a compact audio module with transducers that may be operated as an acoustic dipole or acoustic quadrupole. The audio module provides ducts that convey sound with a particular phase from a transducer to particular output ports. The phase of sound emitted from a first output port is opposite to the phase of sound emitted from a second output port. The audio module may include a pair of transducers, enabling operation as an acoustic dipole or quadrupole. The ducts are integrated into elements of the structure of the audio module, minimizing the overall size of the audio module.

公开(公告)号：US10904669B1

公开(公告)日：2021-01-26

申请号：US16712299

申请日：2019-12-12

Applicant: AMAZON TECHNOLOGIES, INC.

Inventor： Shahram Talakoub ,  Jianchun Dong ,  Peng Zhang ,  Yuwen Su ,  Xuan Zhong

IPC: H04R1/32 ,  H04R5/04 ,  H04R3/04 ,  H03G5/16 ,  H04S7/00 ,  G02B27/01 ,  H04R1/02 ,  H04R1/10 ,  H04R1/20 ,  H04R3/12

Abstract: A head-mounted wearable device (HMWD) provides audio output from a first speaker that is driven with a first signal and a second speaker that is driven with a second signal. Based on a volume level setting, an equalization profile and inversion frequency are determined. The equalization profile selectively amplifies or attenuates particular frequencies or ranges of frequencies. Those frequencies in the second signal that are above the inversion frequency have their amplitude inverted, relative to the first signal. When driven by the first signal and the second signal, the first speaker and the second speaker operate as acoustic dipoles below the inversion frequency and acoustic quadrupoles above the inversion frequency. Sound from the first and second speakers with frequencies above the inversion frequency exhibits destructive interference. As a result, the user wearing the HMWD is able hear audio output while audio amplitude perceived by the bystanders is significantly reduced.