公开(公告)号：US12192695B1

公开(公告)日：2025-01-07

申请号：US17708607

申请日：2022-03-30

Applicant: Amazon Technologies, Inc.

Inventor： Andrew Jackson Stockton X ,  Mihir Dhananjay Shetye ,  Wontak Kim ,  Zhen Sun

IPC: H04R1/10 ,  G10K11/178

Abstract: A wearable audio output device (e.g., headphones) having an open design that allows ambient noise to pass to a listener without physically isolating the listener from a surrounding environment. The device may include an open earcup design that may partially or completely surround the listener's ear, and in some examples a portion of the listener's head may be uncovered by the open earcup. To improve comfort, the device includes a floating audio component configured to generate output audio in a direction of the listener's ear without contacting the listener's ear. To reduce an amount of ambient noise, the device may be configured to perform active noise cancellation (ANC) processing using feedforward and/or feedback microphones. The device may include an acoustic structure configured to direct the output audio in the direction of the listener's ear and/or position the feedback microphone(s) closer to the listener's ear.

公开(公告)号：US11564036B1

公开(公告)日：2023-01-24

申请号：US17076584

申请日：2020-10-21

Applicant: Amazon Technologies, Inc.

Inventor： Krishna Kamath Koteshwara ,  Zhen Sun ,  Spencer Russell ,  Tarun Pruthi ,  Yuzhou Liu ,  Wan-Chieh Pai

IPC: H04R3/04 ,  H04R5/04 ,  G10L21/0232 ,  G01S15/04 ,  H04R5/027 ,  G10L21/0208

Abstract: Techniques for presence-detection devices to detect movement of a person in an environment by emitting ultrasonic signals using a loudspeaker that is concurrently outputting audible sound. To detect movement by the person, the devices characterize the change in the frequency, or the Doppler shift, of the reflections of the ultrasonic signals off the person caused by the movement of the person. However, when a loudspeaker plays audible sound while emitting the ultrasonic signal, audio signals generated by microphones of the devices include distortions caused by the loudspeaker. These distortions can be interpreted by the presence-detection devices as indicating movement of a person when there is no movement, or as indicating lack of movement when a user is moving. The techniques include processing audio signals to remove distortions to more accurately identify changes in the frequency of the reflections of the ultrasonic signals caused by the movement of the person.