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1. 发明授权

US08625776B2 Detection and suppression of returned audio at near-end 有权
标题翻译：在近端检测和抑制返回的音频
公开(公告)号：US08625776B2
公开(公告)日：2014-01-07
申请号：US12565374
申请日：2009-09-23
申请人： Peter L. Chu , Wayne Dunlap
发明人： Peter L. Chu , Wayne Dunlap
IPC分类号： H04M9/08
CPC分类号： H04M3/002 , H04M1/6033 , H04M3/2236 , H04M3/568 , H04M9/085
摘要： Audio from a near-end that has been acoustically coupled at the far-end and returned to the near-end unit is detected and suppressed at the near-end of a conference. First and second energy outputs for separate bands are determined for the near-end audio being sent from the near-end unit and for the far-end audio being received at the near-end unit. The near-end unit compares the first and second energy outputs to one another for each of the bands over a time delay range and detects the return of the sent near-end audio in the received far-end audio based on the comparison. The comparison can use a cross-correlation to find an estimated time delay used for further analysis of the near and far-end energies. The near-end unit suppresses any detected return by muting or reducing what far-end audio is output at its loudspeaker.
摘要翻译：来自远端的声耦合并返回到近端单元的近端的音频在会议的近端被检测和抑制。确定用于单独频带的第一和第二能量输出用于从近端单元发送的近端音频以及在近端单元处接收的远端音频。近端单元在时间延迟范围内针对每个频带将第一和第二能量输出彼此进行比较，并且基于该比较来检测所接收的远端音频中所发送的近端音频的返回。比较可以使用互相关来找到用于进一步分析近端和远端能量的估计时间延迟。近端单元通过静音抑制任何检测到的返回，或者减少在其扬声器处输出远端音频。

2. 发明申请

US20130106977A1 Pairing Devices in Conference Using Ultrasonic Beacon 有权
标题翻译：配对设备在会议使用超声波信标
公开(公告)号：US20130106977A1
公开(公告)日：2013-05-02
申请号：US13282609
申请日：2011-10-27
申请人： Peter L. Chu , Yibo Liu
发明人： Peter L. Chu , Yibo Liu
IPC分类号： H04N7/15 , H04M3/42
CPC分类号： H04N7/15 , G06F3/165 , H04M3/568 , H04N7/142
摘要： A videoconferencing system has a videoconferencing unit that use portable devices as peripherals for the system. The portable devices obtain near-end audio and send the audio to the videoconferencing unit via a wireless connection. In turn, the videoconferencing unit sends the near-end audio from the loudest portable device along with near-end video to the far-end. The portable devices can control the videoconferencing unit and can initially establish the videoconference by connecting with the far-end and then transferring operations to the videoconferencing unit. To deal with acoustic coupling between the unit's loudspeaker and the portable device's microphone, the unit uses an echo canceller that is compensated for differences in the clocks used in the A/D and D/A converters of the loudspeaker and microphone.
摘要翻译：视频会议系统具有视频会议单元，其使用便携式设备作为系统的外围设备。便携式设备获得近端音频，并通过无线连接将音频发送到视频会议单元。反过来，视频会议单元将最接近便携式设备的近端音频和近端视频一起发送到远端。便携式设备可以控制视频会议单元，并且可以通过与远端连接然后将操作传送到视频会议单元来最初建立视频会议。为了处理单元的扬声器和便携式设备的麦克风之间的声耦合，该单元使用回波消除器，其补偿扬声器和麦克风的A / D和D / A转换器中使用的时钟的差异。

3. 发明申请

US20120320143A1 Automatic Camera Selection for Videoconferencing 有权
标题翻译：自动相机选择视频会议
公开(公告)号：US20120320143A1
公开(公告)日：2012-12-20
申请号：US13163837
申请日：2011-06-20
申请人： Peter L. CHU , Jinwei FENG , Krishna SAI
发明人： Peter L. CHU , Jinwei FENG , Krishna SAI
IPC分类号： H04N7/15
CPC分类号： H04N7/15 , G01S3/8036 , H04M3/567 , H04M3/569 , H04M2201/50
摘要： In videoconference camera selection, audio inputs associated with cameras for a videoconference are each processed into first and second audio energies respectively for first and second frequency ranges. The selection then determines which of the audio inputs has a greatest ratio of the first audio energy to the second audio energy and selects the associated camera view for outputting video for the videoconference. The selection can also process video inputs from the cameras either alone or in combination with the audio processing. Either way, the selection processes each of the video inputs for at least one facial characteristic and determines which of the video inputs has a greatest likelihood of framing a human face. In the end, the selection selects the associated camera view for outputting video for the videoconference based at least in part on this video-based determination.
摘要翻译：在视频会议相机选择中，与用于视频会议的相机相关联的音频输入分别被分别用于第一和第二频率范围的第一和第二音频能量。然后，该选择确定哪个音频输入具有第一音频能量与第二音频能量的最大比率，并且选择用于输出用于视频会议的视频的相关联的摄像机视图。选择还可以单独处理来自摄像机的视频输入或与音频处理相结合。无论哪种方式，选择处理至少一个面部特征的每个视频输入，并且确定哪个视频输入具有构图人脸的最大可能性。最后，该选择至少部分地基于该基于视频的确定来选择用于输出用于视频会议的视频的相关联的摄像机视图。

4. 发明授权

US08219400B2 Stereo to mono conversion for voice conferencing 有权
标题翻译：立体声转换为语音会议
公开(公告)号：US08219400B2
公开(公告)日：2012-07-10
申请号：US12275393
申请日：2008-11-21
申请人： Peter L. Chu
发明人： Peter L. Chu
IPC分类号： G10L11/00
CPC分类号： H04R27/00 , H04M3/56
摘要： Stereo to mono voice conferencing conversion is performed during a voice conference. Conferencing equipment receives audio for right and left channels and filters each of the channels into a plurality of bands. For each band of each channel, the equipment determines an energy level and compares each energy level for each band of the right channel to each energy level for each corresponding band of the left channel. Based on the comparison, the equipment determines which channel has more audio resulting from speech. Based on the determination, the equipment adjusts delivery of the audio from the right and left channels to a mono channel for transmission to endpoints only capable of mono audio in the voice conference.
摘要翻译：在语音会议期间执行立体声到单声道语音会议转换。会议设备接收用于右声道和左声道的音频，并且将每个声道滤波成多个频带。对于每个通道的每个频带，设备确定能量水平，并将每个频带的每个频带的每个能级与每个相应的左声道频带的能级进行比较。基于比较，设备确定哪个频道具有更多的来自语音的音频。基于确定，设备将音频从右声道和左声道的传送调整到单声道，以传输到只能在语音会议中单声道音频的端点。

5. 发明授权

US08130977B2 Cluster of first-order microphones and method of operation for stereo input of videoconferencing system 有权
标题翻译：视频会议系统立体声输入的一级麦克风和操作方法
公开(公告)号：US08130977B2
公开(公告)日：2012-03-06
申请号：US11320323
申请日：2005-12-27
申请人： Peter L. Chu
发明人： Peter L. Chu
IPC分类号： H04R3/00 , H04R1/02 , H04R29/00 , H04R5/00
CPC分类号： H04R3/005 , H04R1/406
摘要： An arbitrarily positioned cluster of three microphones can be used for stereo input of a videoconferencing system. To produce stereo input, right and left weightings for signal inputs from each of the microphones are determined. The right and left weightings correspond to preferred directive patterns for stereo input of the system. The determined right weightings are applied to the signal inputs from each of the microphones, and the weighted inputs are summed to product the right input. The same is done for the left input using the determined left weightings. The three microphones are preferably first-order, cardioid microphone capsules spaced close together in an audio unit, where each faces radially outward at 120-degrees. The orientation of the arbitrarily positioned cluster relative to the system can be determined by directly detecting the orientation or by using stored arrangements.
摘要翻译：三个麦克风的任意定位的群集可以用于视频会议系统的立体声输入。为了产生立体声输入，确定来自每个麦克风的信号输入的右和右加权。右和右加权对应于系统的立体声输入的优选指令模式。确定的权重被应用于来自每个麦克风的信号输入，并且将加权输入相加以产生正确的输入。对于左输入，使用确定的左权重也是一样。这三个麦克风最好是在音频单元中彼此靠近的一级的心形麦克风胶囊，其中每个都以120度径向向外。可以通过直接检测取向或使用存储的布置来确定任意定位的簇相对于系统的取向。

6. 发明申请

US20100131278A1 Stereo to Mono Conversion for Voice Conferencing 有权
标题翻译：立体声到语音会议的单声道转换
公开(公告)号：US20100131278A1
公开(公告)日：2010-05-27
申请号：US12275393
申请日：2008-11-21
申请人： Peter L. Chu
发明人： Peter L. Chu
IPC分类号： G10L21/00
CPC分类号： H04R27/00 , H04M3/56
摘要： Stereo to mono voice conferencing conversion is performed during a voice conference. Conferencing equipment receives audio for right and left channels and filters each of the channels into a plurality of bands. For each band of each channel, the equipment determines an energy level and compares each energy level for each band of the right channel to each energy level for each corresponding band of the left channel. Based on the comparison, the equipment determines which channel has more audio resulting from speech. Based on the determination, the equipment adjusts delivery of the audio from the right and left channels to a mono channel for transmission to endpoints only capable of mono audio in the voice conference.
摘要翻译：在语音会议期间执行立体声到单声道语音会议转换。会议设备接收用于右声道和左声道的音频，并且将每个声道滤波成多个频带。对于每个通道的每个频带，设备确定能量水平，并将每个频带的每个频带的每个能级与每个相应的左声道频带的能级进行比较。基于比较，设备确定哪个频道具有更多的来自语音的音频。基于确定，设备将音频从右声道和左声道的传送调整到单声道，以传输到只能在语音会议中单声道音频的端点。

7. 发明授权

US5305307A Adaptive acoustic echo canceller having means for reducing or eliminating echo in a plurality of signal bandwidths 失效
标题翻译：具有用于减少或消除多个信号带宽中的回波的装置的自适应声学回声消除器
公开(公告)号：US5305307A
公开(公告)日：1994-04-19
申请号：US659579
申请日：1991-02-21
申请人： Peter L. Chu
发明人： Peter L. Chu
IPC分类号： H04B3/20 , H04B3/23 , H04M9/08 , H04R3/02 , H04J1/00
CPC分类号： H04M9/082 , H04R3/02 , H04R2430/03
摘要： An echo cancelling device for reducing acoustic feedback between a loudspeaker and microphone in a full duplex communication system such as a telephone conferencing system. The device includes a whitening filter which flattens the microphone signal's spectrum and reduces its auto-correlation. A first signal splitter separates the whitened microphone signal into a plurality of bandlimited microphone signals. The loudspeaker signal is similarly whitened and separated into a plurality of bandlimited loudspeaker signals. A plurality of adaptive echo estimators estimate the echo in each frequency band defined by the above signal splitters. More specifically, each estimator generates an echo estimation signal representing an approximation of the acoustic feedback of a corresponding bandlimited loudspeaker signal into the microphone. To cancel echo, a subtractor removes each echo estimation signal from the bandlimited microphone signal of the same frequency band as the estimation signal. The device further processes the echo corrected signal in each band with a center clipper, to remove any residual echo, and with a noise filler to simulate the background signals removed by the clippers.
摘要翻译：一种用于在诸如电话会议系统的全双工通信系统中降低扬声器和麦克风之间的声反馈的回波消除装置。该器件包括一个白化滤光片，使麦克风信号的光谱变平，并减少其自相关。第一信号分离器将白化的麦克风信号分离成多个带限麦克风信号。扬声器信号同样被白化并分离成多个带限扬声器信号。多个自适应回波估计器估计由上述信号分离器定义的每个频带中的回波。更具体地说，每个估计器产生一个回声估计信号，该信号表示相应的限制扬声器信号到麦克风的声反馈的近似值。为了取消回波，减法器从与估计信号相同的频带的有限麦克风信号中去除每个回波估计信号。该装置进一步用中心裁剪器处理每个频带中的回波校正信号，以消除任何残留回波，并用噪声填充器来模拟由剪刀去除的背景信号。

8. 发明授权

US08831932B2 Scalable audio in a multi-point environment 有权
标题翻译：可扩展音频在多点环境中
公开(公告)号：US08831932B2
公开(公告)日：2014-09-09
申请号：US13294471
申请日：2011-11-11
申请人： Jinwei Feng , Peter L. Chu , Stephen Botzko
发明人： Jinwei Feng , Peter L. Chu , Stephen Botzko
IPC分类号： G10L11/04
CPC分类号： G10L19/002 , G10L19/0212 , G10L19/24 , G10L25/18 , H04M3/568 , H04M7/0072
摘要： Use of a scalable audio codec to implement distributed mixing and/or sender bit rate regulation in a multipoint conference is disclosed. The scalable audio codec allows the audio signal from each endpoint to be split into one or more frequency bands and for the transform coefficients within such bands to be prioritized such that usable audio may be decoded from a subset of the entire signal. The subset may be created by omitting certain frequency bands and/or by omitting certain coefficients within the frequency bands. By providing various rules for each endpoint in a conference, the endpoint can determine the importance of its signal to the conference and can select an appropriate bit rate, thereby conserving bandwidth and/or processing power throughout the conference.
摘要翻译：公开了使用可扩展音频编解码器来实现多点会议中的分布式混合和/或发送器比特率调节。可扩展音频编解码器允许来自每个端点的音频信号被分成一个或多个频带，并且为了使这些频带内的变换系数被优先化，使得可以从整个信号的子集中解码可用的音频。可以通过省略某些频带和/或通过省略频带内的某些系数来创建该子集。通过为会议中的每个端点提供各种规则，端点可以确定其信号到会议的重要性，并且可以选择适当的比特率，从而节省整个会议的带宽和/或处理能力。

9. 发明申请

US20110069830A1 Detection and Suppression of Returned Audio at Near-End 有权
标题翻译：返回音频在近端的检测和抑制
公开(公告)号：US20110069830A1
公开(公告)日：2011-03-24
申请号：US12565374
申请日：2009-09-23
申请人： Peter L. Chu , Wayne Dunlap
发明人： Peter L. Chu , Wayne Dunlap
IPC分类号： H04M9/08
CPC分类号： H04M3/002 , H04M1/6033 , H04M3/2236 , H04M3/568 , H04M9/085
摘要： Audio from a near-end that has been acoustically coupled at the far-end and returned to the near-end unit is detected and suppressed at the near-end of a conference. First and second energy outputs for separate bands are determined for the near-end audio being sent from the near-end unit and for the far-end audio being received at the near-end unit. The near-end unit compares the first and second energy outputs to one another for each of the bands over a time delay range and detects the return of the sent near-end audio in the received far-end audio based on the comparison. The comparison can use a cross-correlation to find an estimated time delay used for further analysis of the near and far-end energies. The near-end unit suppresses any detected return by muting or reducing what far-end audio is output at its loudspeaker.
摘要翻译：来自远端的声耦合并返回到近端单元的近端的音频在会议的近端被检测和抑制。确定用于单独频带的第一和第二能量输出用于从近端单元发送的近端音频以及在近端单元处接收的远端音频。近端单元在时间延迟范围内针对每个频带将第一和第二能量输出彼此进行比较，并且基于该比较来检测所接收的远端音频中所发送的近端音频的返回。比较可以使用互相关来找到用于进一步分析近端和远端能量的估计时间延迟。近端单元通过静音抑制任何检测到的返回，或者减少在其扬声器处输出远端音频。

10. 发明授权

US07787328B2 System and method for computing a location of an acoustic source 有权
标题翻译：用于计算声源位置的系统和方法
公开(公告)号：US07787328B2
公开(公告)日：2010-08-31
申请号：US11015373
申请日：2004-12-17
申请人： Peter L. Chu , Michael Kenoyer , Richard Washington
发明人： Peter L. Chu , Michael Kenoyer , Richard Washington
IPC分类号： G01S3/802
CPC分类号： H04R3/005 , G01S5/18 , H04N7/142 , H04R2201/401 , H04R2430/23
摘要： In accordance with the present invention, a system and method for computing a location of an acoustic source is disclosed. The method includes steps of processing a plurality of microphone signals in frequency space to search a plurality of candidate acoustic source locations for a maximum normalized signal energy. The method uses phase-delay look-up tables to efficiently determine phase delays for a given frequency bin number k based upon a candidate source location and a microphone location, thereby reducing system memory requirements. Furthermore, the method compares a maximum signal energy for each frequency bin number k with a threshold energy Et(k) to improve accuracy in locating the acoustic source.
摘要翻译：根据本发明，公开了一种用于计算声源的位置的系统和方法。该方法包括在频率空间中处理多个麦克风信号以搜索多个候选声源位置以获得最大归一化信号能量的步骤。该方法使用相位延迟查找表来有效地确定基于候选源位置和麦克风位置的给定频率仓数k的相位延迟，从而减少系统存储器要求。此外，该方法将每个频率仓数k的最大信号能量与阈值能量Et（k）进行比较，以提高定位声源的精度。

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