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1. 发明授权

EP1166455B1 DOPPLER SPREAD ESTIMATION SYSTEM 有权
标题翻译：多普勒扩展估计系统
公开(公告)号：EP1166455B1
公开(公告)日：2005-08-31
申请号：EP00915916.1
申请日：2000-02-29
申请人： Ericsson Inc.
发明人： KRASNY, Leonid , CHENNAKESHU, Sandeep , KOILPILLAI, R., David
IPC分类号： H04B1/707 , H04B7/01
CPC分类号： H04B7/01 , H04B1/707 , H04B1/709 , H04B2201/70701

2. 发明授权

EP1261961B1 METHODS AND SYSTEMS FOR NOISE REDUCTION FOR SPATIALLY DISPLACED SIGNAL SOURCES 有权
标题翻译：方法和系统进行降噪领土OFFSET来源
公开(公告)号：EP1261961B1
公开(公告)日：2004-03-31
申请号：EP01904915.4
申请日：2001-01-18
申请人： Ericsson Inc.
发明人： KRASNY, Leonid , KHAYRALLAH, Ali, S.
IPC分类号： G10K11/178
CPC分类号： G10K11/178
摘要： The spatial characteristics associated with the respective locations of various signal sources within the receiver environment, such as a vehicle, are used in processing received signals from the signal sources. The use of the spatial characteristics may provide improved noise reduction and further, in various embodiments of the present invention, may be used to apply a selected suppression level to one or more of the signal sources. For example, in a vehicle hands-free speech reception system, far-end feedback from a speaker in the vehicle may be substantially suppressed while speech from a driver and a passenger in the vehicle may be processed with substantially zero decibels of suppression. The suppression levels may be user selectable.

3. 发明公开

EP1171990A1 METHOD AND APPARATUS FOR SPACE-TIME ECHO CANCELLATION 审中-公开
标题翻译：方法和装置时空回声抑制
公开(公告)号：EP1171990A1
公开(公告)日：2002-01-16
申请号：EP00918518.2
申请日：2000-03-31
申请人： Ericsson Inc.
发明人： KRASNY, Leonid
IPC分类号： H04M9/08
CPC分类号： H04M9/082
摘要： Echo is canceled in a communication device including at least one microphone and a loudspeaker. Signals directed to the loudspeaker are filtered through at least one first filter. The filtered signals are subtracted from signals received by the microphone. At least one second filter filters the subtracted results to produce a signal corresponding to speech signals received by the microphone. At least one third filter filters the subtracted results to produce a signal corresponding to echo from the loudspeaker. The output from the third filter is subtracted from the output from the second filter to produce an echo-canceled signal. The device may include a number of microphones, and the first, second, and third filters may each include a number of filters equal to the number of microphones. The outputs from the second filter may be added, the outputs from the third filter may be added, and the sum of the outputs from the third filter may be subtracted from the sum of the outputs of the second filter. The output from the third filter may be weighted before being subtracted from output of the second filter.

4. 发明公开

EP1166455A1 DOPPLER SPREAD ESTIMATION SYSTEM 有权
标题翻译：多普勒扩展估计系统
公开(公告)号：EP1166455A1
公开(公告)日：2002-01-02
申请号：EP00915916.1
申请日：2000-02-29
申请人： Ericsson Inc.
发明人： KRASNY, Leonid , CHENNAKESHU, Sandeep , KOILPILLAI, R., David
IPC分类号： H04B1/707 , H04B7/01
CPC分类号： H04B7/01 , H04B1/707 , H04B1/709 , H04B2201/70701
摘要： A receiving apparatus Doppler spread estimator includes a receiver receiving signals over a transmission channel that varies over time due to fading and converting the signals to digital samples for processing. A stationarizer operatively associated with the receiver stationarizes the digital samples. An estimator is operatively associated with the stationarizer for estimating spectral density of the stationarized digital samples. The correlator is operatively coupled to the estimator for correlating the spectral density estimates with functions corresponding to hypotheses of plural Doppler spread values to select one of the Doppler spread values as an estimate of actual Doppler spread.
摘要翻译：接收设备多普勒扩展估计器包括接收机，该接收机通过传输信道接收由于衰落而随时间变化的信号并将该信号转换为数字样本以进行处理。与接收机可操作地相关联的定位器对数字样本进行定位。估计器可操作地与平台化器相关联，用于估计定位的数字样本的谱密度。相关器可操作地耦合到估计器，用于将谱密度估计与对应于多个多普勒扩展值的假设的函数进行相关，以选择多普勒扩展值中的一个作为实际多普勒扩展的估计。

5. 发明公开

EP1350244A2 NOISE REDUCTION APPARATUS AND METHOD 审中-公开
标题翻译：装置和方法进行降噪
公开(公告)号：EP1350244A2
公开(公告)日：2003-10-08
申请号：EP02703081.6
申请日：2002-01-09
申请人： Ericsson Inc.
发明人： KRASNY, Leonid , KHAYRALLAH, Ali
IPC分类号： G10L21/02
CPC分类号： G10L21/0208 , G10L2021/02166
摘要： A method and noise reduction apparatus comprises a microphone array including a plurality of microphone elements for receiving a training signal including a plurality of training signal samples, and a working signal including a plurality of working signal samples, and at least one frequency domain convertor coupled to the plurality of microphone elements for converting the plurality of training signal samples and the plurality of working signal samples to the frequency domain. A signal spatial correlation matrix estimator is coupled to the at least one frequency domain convertor for estimating a signal spatial correlation matrix using the converted plurality of training signal samples. An inverse noise spatial correlation matrix estimator is coupled to the at least one frequency domain convertor for estimating an inverse noise spatial correlation matrix using the converted plurality of working signal samples. A constrained output generator is coupled to the at least one frequency domain converter, the signal spatial correlation matrix estimator and the inverse noise spatial correlation matrix estimator for generating a constrained output for the noise reduction apparatus using the converted working signal samples, the estimated signal spatial correlation matrix and the estimated inverse noise spatial correlation matrix.

6. 发明公开

EP1261961A1 METHODS AND SYSTEMS FOR NOISE REDUCTION FOR SPATIALLY DISPLACED SIGNAL SOURCES 有权
标题翻译：方法和系统进行降噪领土OFFSET来源
公开(公告)号：EP1261961A1
公开(公告)日：2002-12-04
申请号：EP01904915.4
申请日：2001-01-18
申请人： Ericsson Inc.
发明人： KRASNY, Leonid , KHAYRALLAH, Ali, S.
IPC分类号： G10K11/178
CPC分类号： G10K11/178
摘要： The spatial characteristics associated with the respective locations of various signal sources within the receiver environment, such as a vehicle, are used in processing received signals from the signal sources. The use of the spatial characteristics may provide improved noise reduction and further, in various embodiments of the present invention, may be used to apply a selected suppression level to one or more of the signal sources. For example, in a vehicle hands-free speech reception system, far-end feedback from a speaker in the vehicle may be substantially suppressed while speech from a driver and a passenger in the vehicle may be processed with substantially zero decibels of suppression. The suppression levels may be user selectable.

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