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    Detecting Proximity of Devices Based on Transmission of Inaudible Sound Signatures in the Speech Band
    21.
    发明申请
    Detecting Proximity of Devices Based on Transmission of Inaudible Sound Signatures in the Speech Band 有权
    基于语音段中听不到的声音签名的传输来检测设备的接近度

    公开(公告)号：US20160301810A1

    公开(公告)日：2016-10-13

    申请号：US14680354

    申请日：2015-04-07

    Applicant: Cisco Technology, Inc.

    Inventor： Michael P. Dimitroff ,  Michael A. Ramalho

    IPC: H04M19/04 ,  G01S3/80

    CPC classification number: H04M19/041 ,  G01S3/80

    Abstract: A communication device detects sound with a microphone to produce a sound signal representative of the sound and searches the sound signal for unique inaudible sound signatures associated with a group identifier. Each sound signature identifies a respective communication device. Each sound signature is in an audible frequency band but masked to be imperceptible. If any of the sound signatures are determined to be present in the sound signal, the communication device selects one based on predetermined criteria associated with the group identifier.

    Abstract translation: 通信设备用麦克风检测声音以产生表示声音的声音信号，并且搜索声音信号以获得与组标识符相关联的唯一的听不到的声音签名。 每个声音签名识别相应的通信设备。 每个声音签名处于可听见的频段，但是被掩盖为不可察觉的。 如果声音信号中的任何一个被确定为存在于声音信号中，则通信设备基于与组标识符相关联的预定标准来选择一个。

    Obtaining replay of audio during a conference session
    22.
    发明授权
    Obtaining replay of audio during a conference session 有权
    在会议期间获取音频的重放

    公开(公告)号：US09363480B2

    公开(公告)日：2016-06-07

    申请号：US14464038

    申请日：2014-08-20

    Applicant: Cisco Technology, Inc.

    Inventor： Michael A. Ramalho

    IPC: H04N7/14 ,  H04N7/15 ,  H04L29/06

    CPC classification number: H04N7/155 ,  H04L12/1822 ,  H04L12/1831 ,  H04L65/4023 ,  H04L65/403 ,  H04L65/602 ,  H04L65/608 ,  H04L65/80

    Abstract: Presented herein are techniques for receiving media at a participant device for a conference session. The media may be transmitted to the participant device using a first transport mechanism. A command is received from a user of a participant device in a conference session to playback a portion of the conference session. A request is sent to the conference server to retransmit a recording of the portion of the conference session requested for playback. Data is received for the recording of the portion of the conference session transmitted from the conference server using a second transport mechanism, wherein the second transport mechanism is a higher reliability transport mechanism than the first transport mechanism.

    Abstract translation: 这里呈现的是用于在会议会话的参与者设备处接收媒体的技术。 可以使用第一传送机制将媒体发送到参与者设备。 在会议会话中从参与者设备的用户接收命令以回放会议会话的一部分。 向会议服务器发送请求以重发会议请求重放的部分的记录。 接收用于记录从会议服务器使用第二传送机构发送的会议会话的部分的数据，其中第二传送机构是比第一传送机构更高的可靠性传输机制。

    CONTROLLING ECHO IN A WIDEBAND VOICE CONFERENCE
    23.
    发明申请
    CONTROLLING ECHO IN A WIDEBAND VOICE CONFERENCE 审中-公开

    公开(公告)号：US20150078549A1

    公开(公告)日：2015-03-19

    申请号：US14552723

    申请日：2014-11-25

    Applicant: Cisco Technology, Inc.

    Inventor： James C. Frauenthal ,  Michael A. Ramalho

    IPC: H04M3/00

    CPC classification number: H04M3/002 ,  H04M3/568 ,  H04M9/082

    Abstract: In one embodiment, an echo canceller configured to cancel echo in a wideband voice conference is provided. A double-talk condition may be when a plurality of users are speaking substantially simultaneously. When a double-talk condition is detected in the wideband conference, a high-frequency process is enabled and used to process signals in the high band to reduce echo. Accordingly, echo in the high band may not be produced by end devices being used by the users' speaking. Also, the users speaking have the echo cancelled in the low band and substantial echo does not result. This results in the users speaking experiencing the conference in the narrowband. The other users that are not speaking, however, continue to receive wideband signals. The users not speaking also continue to have echo cancellation performed for the high band and low band because these users are not speaking and thus attenuation of their voices is not a consideration.

    Echo mitigation in the presence of variable delays due to adaptive jitter buffers
    24.
    发明授权
    Echo mitigation in the presence of variable delays due to adaptive jitter buffers 有权
    由于自适应抖动缓冲区，存在可变延迟的回波减轻

    公开(公告)号：US08929263B2

    公开(公告)日：2015-01-06

    申请号：US13905640

    申请日：2013-05-30

    Applicant: Cisco Technology, Inc.

    Inventor： Michael A. Ramalho ,  Gary Skrabutenas ,  Jim Frauenthal

    IPC: H04B3/20 ,  H04M3/00 ,  H04M9/08 ,  H04B3/23

    CPC classification number: H04M3/002 ,  H04B3/23 ,  H04M9/082

    Abstract: In an example embodiment, a control connection is introduced between an adaptive jitter buffer (AJB) and an adaptive bulk delay (ABD) buffer of an echo canceller (ECAN) in an Internet Protocol (IP) conference bridge. The control connection allows the AJB to control the amount of delay inserted by the ABD in the ECAN convolution processor (CP) signal path. The adjustment in ABD delay restores the time alignment of the ECAN internal echo estimate and offsets variations in echo tail delay introduced by network induced AJB delay changes. Time-invariance is preserved in the echo tail path.

    Abstract translation: 在示例实施例中，在互联网协议（IP）会议桥中的回波消除器（ECAN）的自适应抖动缓冲器（AJB）和自适应批量延迟（ABD）缓冲器之间引入控制连接。 控制连接允许AJB控制ABD在ECAN卷积处理器（CP）信号路径中插入的延迟量。 ABD延迟的调整恢复ECAN内部回波估计的时间对齐，并补偿由网络诱发的AJB延迟变化引入的回波尾延迟的变化。 回波尾路径中保留时间不变性。

    Audio fingerprinting for meeting services
    26.
    发明授权
    Audio fingerprinting for meeting services 有权

    公开(公告)号：US10825460B1

    公开(公告)日：2020-11-03

    申请号：US16503081

    申请日：2019-07-03

    Applicant: Cisco Technology, Inc.

    Inventor： Michael A. Ramalho ,  Jonathan Rosenberg ,  Keith Griffin ,  Niall L McDonnell ,  Liam Frawley ,  Martin Bernard Feeney

    IPC: G10L19/018 ,  G10L25/06

    Abstract: The present technology can receive audio segments from sources within one or more conference room, and can create audio fingerprints from the sources. The audio fingerprints are optimized for audio in conference room environments, which include distortions from room impulse responses, and various encoding used by telecommunication networks. In some embodiments, when two audio segments are matched, a user equipment can be instructed to mute its speakers to avoid feedback. In some embodiments, when two audio segments are matched, a user equipment can be given instructions to join a conference taking place in the room in when the audio segment originated.

    Efficient handling of clock offset in spread spectrum decoders
    28.
    发明授权
    Efficient handling of clock offset in spread spectrum decoders 有权

    公开(公告)号：US10601459B1

    公开(公告)日：2020-03-24

    申请号：US16179234

    申请日：2018-11-02

    Applicant: Cisco Technology, Inc.

    Inventor： Knut Inge Hvidsten ,  Michael A. Ramalho ,  Ragnvald Balch Barth

    IPC: H04B1/7095 ,  H04L7/00 ,  H04B1/708

    Abstract: Doppler correlators are configured to receive samples of a signal sampled based on a frequency. Each Doppler correlator includes successive butterfly elements. Each butterfly element includes cross-coupled first and second branches that include a sample delay that doubles for each successive butterfly element, and a sample inversion selectively placed in one of the first and second branches to encode into the successive butterfly elements of each Doppler correlator the same code sequence. Each Doppler correlator is configured with a respective phase rotation that varies across the Doppler correlators. Each Doppler correlator is configured to correlate the samples against the code sequence and apply the respective phase rotation to the samples as the samples are shifted through the successive butterfly elements, to produce respective correlation results from each Doppler correlator centered on a respective frequency offset from the frequency that varies across the Doppler correlators based on the phase rotations.

    Adaptive decoding of spread spectrum signals using multiple correlator peaks
    29.
    发明授权
    Adaptive decoding of spread spectrum signals using multiple correlator peaks 有权

    公开(公告)号：US10396846B1

    公开(公告)日：2019-08-27

    申请号：US16158794

    申请日：2018-10-12

    Applicant: Cisco Technology, Inc.

    Inventor： Ragnvald Balch Barth ,  Knut Inge Hvidsten ,  Michael A. Ramalho

    IPC: H04B1/7075 ,  H04B1/7117 ,  H04B17/336 ,  H04B1/7105 ,  H04B1/7163 ,  H04B1/717

    Abstract: Time-offset, time-overlapping signals are received. The signals each include a pilot code, and at least some of the signals each include a user code occupying a time slot time-synchronized to a respective pilot code. Time-offset cross-correlation peaks for respective ones of the pilot codes are generated, each cross-correlation peak indicating a respective one of the time slots. For each time slot a respective projection vector including user code projections each indicative of whether a respective user code of known user codes is present in the time slot is generated. Particular ones of the projection vectors are selectively combined into an aggregate projection vector of aggregate user code projections, such that the aggregate projection vector has a signal-to-noise ratio (SNR) greater than the projection vectors individually. The user code is selected from among the known user codes based on the aggregate user code projections of the aggregate projection vector.

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