公开(公告)号：US20230063260A1

公开(公告)日：2023-03-02

申请号：US17459876

申请日：2021-08-27

Applicant: Cisco Technology, Inc.

Inventor： Johan Ludvig Nielsen ,  Patrick Ryan Tompion Achtelik ,  Per Arild Kahrs Dykesteen ,  Ragnvald Balch Barth

IPC: H04R1/40 ,  G10L25/84

Abstract: In one embodiment, a multi-microphone system for an endpoint device receives input signals for a remote conference between the endpoint device and at least one other endpoint device. The multi-microphone system may include at least a top microphone unit and a bottom microphone unit. A signal degradation event that causes degradation of signals received by the top microphone unit or the bottom microphone unit is detected. Then, based on information regarding the signal degradation event, it is determined whether the signal degradation event affects one or both of the top microphone unit and the bottom microphone unit. In response, an output signal is generated for transmission to the at least one other endpoint device, and the output signal uses a portion of the input signals that excludes signals received by the top microphone unit and/or the bottom microphone unit determined to be affected by the signal degradation event.

公开(公告)号：US20200014420A1

公开(公告)日：2020-01-09

申请号：US16502140

申请日：2019-07-03

Applicant: Cisco Technology, Inc.

Inventor： Knut Inge Hvidsten ,  Ragnvald Balch Barth

IPC: H04B1/7093 ,  H04B1/06

Abstract: An apparatus includes an input node, an output node, and successive butterfly elements connected between the input node and the output node. Each butterfly element includes a first branch and a second branch that are cross-coupled with each other and that perform, collectively, sample add and sample delay operations. Either the first branch or the second branch of each butterfly element performs a sample inversion, such that a pattern of the sample inversions across the butterfly elements encodes into the butterfly elements a pattern of negative and positive binary values of a particular row of a Prometheus Orthonormal Sets (PONS) matrix. As a result, the successive butterfly elements correlate input samples applied to the input node against the particular row of the PONS matrix as the input samples are shifted through the successive butterfly elements.

公开(公告)号：US10404319B1

公开(公告)日：2019-09-03

申请号：US16030267

申请日：2018-07-09

Applicant: Cisco Technology, Inc.

Inventor： Knut Inge Hvidsten ,  Ragnvald Balch Barth

IPC: H04B1/00 ,  H04B1/7093 ,  H04B1/06

Abstract: An apparatus includes an input node, an output node, and successive butterfly elements connected between the input node and the output node. Each butterfly element includes a first branch and a second branch that are cross-coupled with each other and that perform, collectively, sample add and sample delay operations. Either the first branch or the second branch of each butterfly element performs a sample inversion, such that a pattern of the sample inversions across the butterfly elements encodes into the butterfly elements a pattern of negative and positive binary values of a particular row of a Prometheus Orthonormal Sets (PONS) matrix. As a result, the successive butterfly elements correlate input samples applied to the input node against the particular row of the PONS matrix as the input samples are shifted through the successive butterfly elements.