公开(公告)号：US12190902B1

公开(公告)日：2025-01-07

申请号：US17672298

申请日：2022-02-15

Applicant: Amazon Technologies, Inc.

Inventor： Aditya Sharadchandra Joshi ,  Zhouhui Miao

IPC: G10L21/0364 ,  G10L15/05 ,  G10L15/08 ,  G10L15/22 ,  G10L15/30 ,  G10L21/034 ,  G10L25/21

Abstract: A system configured to perform audio processing with adaptive multi-stage output gains. For example, an Audio Front End (AFE) component may generate a first output using a fixed gain value in order to improve device arbitration and a second output using an adaptive gain value in order to improve wakeword detection. A wakeword engine may process the second output to determine that a wakeword is present along with start/end times of the wakeword. The AFE component can use the start/end times to determine an amount of wakeword energy represented in the first output, which is sent to a remote device for device arbitration. The AFE component can also use the start/end times to determine an amount of wakeword energy represented in the second output, which can be used to determine the adaptive gain value that is unique to the device.

公开(公告)号：US11528571B1

公开(公告)日：2022-12-13

申请号：US17150599

申请日：2021-01-15

Applicant: Amazon Technologies, Inc.

Inventor： Ian Ernan Liu ,  Carlo Murgia ,  Huiqun Han ,  Zhouhui Miao

IPC: H04R29/00 ,  G10L25/21 ,  G10L25/51 ,  H04R3/00 ,  G10L15/22 ,  H04R1/40 ,  G10L25/18

Abstract: A system configured to perform microphone occlusion event detection. When a device detects a microphone occlusion event, the device will modify audio processing performed prior to speech processing, such as by disabling spatial processing and only processing audio data from a single microphone. The device detects the microphone occlusion event by determining inter-level difference (ILD) values between two microphone signals and using the ILD values as input features to a classifier. For example, when a far-end reference signal is inactive, the classifier may process a first ILD value within a high frequency band. However, when the far-end reference signal is active, the classifier may process the first ILD value and a second ILD value within a low frequency band.