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1. 发明申请

US20060115078A1 Echo canceller having improved non-linear processor 有权
标题翻译：回波消除器具有改进的非线性处理器
公开(公告)号：US20060115078A1
公开(公告)日：2006-06-01
申请号：US11336348
申请日：2006-01-19
申请人： David Farrell , Tianfang Liu
发明人： David Farrell , Tianfang Liu
IPC分类号： H04M9/08
CPC分类号： H04B3/234 , H04M9/082
摘要： A non-linear processor for use in an echo canceller is set forth. The non-linear processor includes a center clipping digital filter receiving an echo compensated signal. The non-linear processor provides a center clipped output signal having non-linear thresholds at values of +TNLP and −TNLP. The value of TNLP is dynamically dependent, at least in part, on echo return loss measurements. To limit the processor's susceptibility to corruption from double-talk conditions, the non-linear processor inhibits the dynamic setting of the TNLP value when a double-talk condition is present. Additionally, or in the alternative, the non-linear processor locks the value of the echo return loss measurement after a predetermined number of consecutive echo return loss measurements have values falling within a predetermined range of one another. Such locking further reduces the susceptibility of the non-linear processor to corruption from double-talk conditions.
摘要翻译：阐述了用于回波消除器的非线性处理器。非线性处理器包括接收回波补偿信号的中心限幅数字滤波器。非线性处理器提供具有在+ T NLP和-T NLP 的值的非线性阈值的中心限幅输出信号。 T NLP 的值至少部分地取决于回波回波损耗测量。为了限制处理器对双向条件的损坏的敏感性，当存在双方通话条件时，非线性处理器禁止T NLP 值的动态设置。另外，或者替代地，非线性处理器在预定数量的连续回波返回损耗测量值具有落在彼此的预定范围内的值之前锁定回波回波损耗测量值。这种锁定进一步降低了非线性处理器对双方语音条件的破坏的敏感性。

2. 发明授权

US06198819B1 Echo canceller having improved non-linear processor 失效
标题翻译：回波消除器具有改进的非线性处理器
公开(公告)号：US06198819B1
公开(公告)日：2001-03-06
申请号：US08970639
申请日：1997-11-14
申请人： David S. Farrell , Tianfang Liu
发明人： David S. Farrell , Tianfang Liu
IPC分类号： H04M900
CPC分类号： H04B3/234 , H04M9/082
摘要： A non-linear processor for use in an echo canceller is set forth. The non-linear processor includes a center clipping digital filter receiving an echo compensated signal. The non-linear processor provides a center clipped output signal having non-linear thresholds at values of +TNLP and −TNLP. The value of TNLP is dynamically dependent, at least in part, on echo return loss measurements. To limit the processor's susceptibility to corruption from double-talk conditions, the non-linear processor inhibits the dynamic setting of the TNLP value when a double-talk condition is present. Additionally, or in the alternative, the non-linear processor locks the value of the echo return loss measurement after a predetermined number of consecutive echo return loss measurements have values falling within a predetermined range of one another. Such locking further reduces the susceptibility of the non-linear processor to corruption from double-talk conditions.
摘要翻译：阐述了用于回波消除器的非线性处理器。非线性处理器包括接收回波补偿信号的中心限幅数字滤波器。非线性处理器提供具有+ TNLP和-TNLP值的非线性阈值的中心限幅输出信号。 TNLP的值至少部分取决于回波回波损耗测量。为了限制处理器对双向条件的损坏的敏感性，当存在双方通话条件时，非线性处理器禁止TNLP值的动态设置。另外，或者替代地，非线性处理器在预定数量的连续回波返回损耗测量值具有落在彼此的预定范围内的值之前锁定回波回波损耗测量值。这种锁定进一步降低了非线性处理器对双方语音条件的破坏的敏感性。

3. 发明授权

US07450714B2 Echo canceller having improved non-linear processor 有权
标题翻译：回波消除器具有改进的非线性处理器
公开(公告)号：US07450714B2
公开(公告)日：2008-11-11
申请号：US11336348
申请日：2006-01-19
申请人： David S. Farrell , Tianfang Liu
发明人： David S. Farrell , Tianfang Liu
IPC分类号： H04M
CPC分类号： H04B3/234 , H04M9/082
摘要： A non-linear processor for use in an echo canceller is set forth. The non-linear processor includes a center clipping digital filter receiving an echo compensated signal. The non-linear processor provides a center clipped output signal having non-linear thresholds at values of +TNLP and −TNLP. The value of TNLP is dynamically dependent, at least in part, on echo return loss measurements. To limit the processor's susceptibility to corruption from double-talk conditions, the non-linear processor inhibits the dynamic setting of the TNLP value when a double-talk condition is present. Additionally, or in the alternative, the non-linear processor locks the value of the echo return loss measurement after a predetermined number of consecutive echo return loss measurements have values falling within a predetermined range of one another. Such locking further reduces the susceptibility of the non-linear processor to corruption from double-talk conditions.
摘要翻译：阐述了用于回波消除器的非线性处理器。非线性处理器包括接收回波补偿信号的中心限幅数字滤波器。非线性处理器提供具有在+ T NLP和-T NLP 的值的非线性阈值的中心限幅输出信号。 T NLP 的值至少部分地取决于回波回波损耗测量。为了限制处理器对双向条件的损坏的敏感性，当存在双方通话条件时，非线性处理器禁止T NLP 值的动态设置。另外，或者替代地，非线性处理器在预定数量的连续回波返回损耗测量值具有落在彼此的预定范围内的值之前锁定回波回波损耗测量值。这种锁定进一步降低了非线性处理器对双方语音条件的破坏的敏感性。

4. 发明授权

US06516063B1 Echo canceller having improved non-linear processor 失效
标题翻译：回波消除器具有改进的非线性处理器
公开(公告)号：US06516063B1
公开(公告)日：2003-02-04
申请号：US09535305
申请日：2000-03-24
申请人： David S. Farrell , Tianfang Liu
发明人： David S. Farrell , Tianfang Liu
IPC分类号： H04M908
CPC分类号： H04B3/234 , H04M9/082
摘要： A non-linear processor for use in an echo canceller is set forth. The non-linear processor includes a center clipping digital filter receiving an echo compensated signal. The non-linear processor provides a center clipped output signal having non-linear thresholds at values of +TNLP and −TNLP. The value of TNLP is dynamically dependent, at least in part, on echo return loss measurements. To limit the processor's susceptibility to corruption from double-talk conditions, the non-linear processor inhibits the dynamic setting of the TNLP value when a double-talk condition is present. Additionally, or in the alternative, the non-linear processor locks the value of the echo return loss measurement after a predetermined number of consecutive echo return loss measurements have values falling within a predetermined range of one another. Such locking further reduces the susceptibility of the non-linear processor to corruption from double-talk conditions.
摘要翻译：阐述了用于回波消除器的非线性处理器。非线性处理器包括接收回波补偿信号的中心限幅数字滤波器。非线性处理器提供具有+ TNLP和-TNLP值的非线性阈值的中心限幅输出信号。 TNLP的值至少部分取决于回波回波损耗测量。为了限制处理器对双向条件的损坏敏感性，当存在双方通话条件时，非线性处理器禁止TNLP值的动态设置。另外，或者替代地，非线性处理器在预定数量的连续回波返回损耗测量值具有落在彼此的预定范围内的值之前锁定回波回波损耗测量值。这种锁定进一步降低了非线性处理器对双方语音条件的破坏的敏感性。

5. 发明授权

US08468269B2 Method and system for compressing location data of a radio for over-the-air transmission 有权
标题翻译：用于压缩用于无线电传输的无线电的位置数据的方法和系统
公开(公告)号：US08468269B2
公开(公告)日：2013-06-18
申请号：US13195611
申请日：2011-08-01
申请人： Dipendra M. Chowdhary , Thomas B. Bohn , Tianfang Liu , David G. Wiatrowski
发明人： Dipendra M. Chowdhary , Thomas B. Bohn , Tianfang Liu , David G. Wiatrowski
IPC分类号： G01S5/14
CPC分类号： H04L69/04 , G01S5/0018 , G01S5/0284
摘要： Disclosed are methods and systems for compressing location data of a radio for over-the-air transmission. A method includes obtaining raw latitude and raw longitude coordinates reflecting a current location of the client device, the raw latitude coordinate represented by x number of bits and the raw longitude coordinate represented by y number of bits. The raw latitude coordinate is truncated by removing n number of most significant bits from the raw latitude coordinate to create a compressed latitude coordinate. The raw longitude coordinate is truncated by removing m number of most significant bits from the raw longitude coordinate to create a compressed longitude coordinate, where m varies as a function of the value of the raw latitude coordinate. The compressed longitude and compressed latitude coordinates are then transmitted to another network device for decompression and use as an indication of the client device's absolute location.
摘要翻译：公开了用于压缩用于无线电传输的无线电的位置数据的方法和系统。一种方法包括获得反映客户端设备的当前位置的原始纬度和原始经度坐标，由x位数表示的原始纬度坐标和由y位数表示的原始经度坐标。通过从原始纬度坐标中移除n个最高有效位来创建压缩纬度坐标，可以截断原始纬度坐标。通过从原始经度坐标中移除m个最高有效位以创建压缩经度坐标来截断原始经度坐标，其中m根据原始纬度坐标的值而变化。压缩经度和压缩纬度坐标然后被发送到另一个网络设备进行解压缩并用作客户端设备绝对位置的指示。

6. 发明授权

US07020278B2 Echo canceller having improved non-linear processor 有权
公开(公告)号：US07020278B2
公开(公告)日：2006-03-28
申请号：US10271189
申请日：2002-10-15
申请人： David S. Farrell , Tianfang Liu
发明人： David S. Farrell , Tianfang Liu
IPC分类号： H04M1/00
CPC分类号： H04B3/234 , H04M9/082
摘要： A non-linear processor for use in an echo canceller is set forth. The non-linear processor includes a center clipping digital filter receiving an echo compensated signal. The non-linear processor provides a center clipped output signal having non-linear thresholds at values of +TNLP and −TNLP. The value of TNLP is dynamically dependent, at least in part, on echo return loss measurements. To limit the processor's susceptibility to corruption from double-talk conditions, the non-linear processor inhibits the dynamic setting of the TNLP value when a double-talk condition is present. Additionally, or in the alternative, the non-linear processor locks the value of the echo return loss measurement after a predetermined number of consecutive echo return loss measurements have values falling within a predetermined range of one another. Such locking further reduces the susceptibility of the non-linear processor to corruption from double-talk conditions.

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