公开(公告)号：US6118812A

公开(公告)日：2000-09-12

申请号：US15568

申请日：1998-01-30

申请人： Nuri Ruhi Dagdeviren

发明人： Nuri Ruhi Dagdeviren

IPC分类号： H03H21/00 ,  H04B3/10 ,  H04L25/03 ,  H03H7/30

CPC分类号： H03H21/0012 ,  H04L25/03006

摘要： A method is presented to enable the impulse response of a channel to be identified when the received signal contains a large amount of quantization noise. A probabilistic estimate of the distribution of the quantization noise is subtracted from the summation of the products of the received training signal samples and tap coefficients to provide a more accurate error signal for the adjustment of the tap coefficients.

摘要翻译： 提出一种方法，用于当接收信号包含大量的量化噪声时能够识别信道的脉冲响应。 从接收到的训练信号样本和抽头系数的乘积的总和中减去量化噪声的分布的概率估计，以提供用于调整抽头系数的更精确的误差信号。

公开(公告)号：US6104758A

公开(公告)日：2000-08-15

申请号：US925181

申请日：1997-09-09

申请人： Takashi Kaku ,  Kyoko Hirao ,  Hideo Miyazawa

发明人： Takashi Kaku ,  Kyoko Hirao ,  Hideo Miyazawa

IPC分类号： H03H15/00 ,  H03H17/00 ,  H03H21/00 ,  H03M13/23 ,  H04B3/04 ,  H04L25/03 ,  H04L27/34 ,  H04L5/12

CPC分类号： H04L27/3411 ,  H04L25/03343 ,  H04L25/4975 ,  H04L27/34

摘要： A transfer process in which, an original vector signal is precoded to an intermediately-precoded vector signal, and the extended modulo operation is performed when the intermediately-precoded vector signal is located outside a predetermined extended-modulo limit area, and the precoded vector signal is transferred through a system having a predetermined filtering characteristic. From the transferred vector signal, the original vector signal is detected, based on a relationship between the vector components of the original vector signal and the transferred vector signal.

公开(公告)号：US6083172A

公开(公告)日：2000-07-04

申请号：US137479

申请日：1998-08-20

申请人： Clark R. Baker, Jr. ,  Thomas J. Yorkey

发明人： Clark R. Baker, Jr. ,  Thomas J. Yorkey

IPC分类号： A61B5/00 ,  A61B5/02 ,  A61B5/024 ,  H03H21/00

CPC分类号： A61B5/7203 ,  A61B5/0075 ,  A61B5/024 ,  A61B5/02416 ,  A61B5/14551 ,  A61B5/14552 ,  A61B5/7207 ,  A61B5/725 ,  A61B5/7239 ,  H03H21/003

摘要： A method and apparatus for reducing the effects of noise on a system for measuring physiological parameters, such as, for example, a pulse oximeter. The method and apparatus of the invention take into account the physical limitations on various physiological parameters being monitored when weighting and averaging a series of measurements. Varying weights are assigned different measurements, measurements are rejected, and the averaging period is adjusted according to the reliability of the measurements. Similarly, calculated values derived from analyzing the measurements are also assigned varying weights and averaged over adjustable periods. More specifically, a general class of filters such as, for example, Kalman filters, is employed in processing the measurements and calculated values. The filters use mathematical models which describe how the physiological parameters change in time, and how these parameters relate to measurement in a noisy environment. The filters adaptively modify a set of averaging weights to optimally estimate the physiological parameters.

公开(公告)号：US6072879A

公开(公告)日：2000-06-06

申请号：US861329

申请日：1997-05-21

申请人： Kunihiro Ouchi ,  Hiroaki Furuta ,  Akio Suyama ,  Yasushi Shimizu

发明人： Kunihiro Ouchi ,  Hiroaki Furuta ,  Akio Suyama ,  Yasushi Shimizu

IPC分类号： H04R3/02 ,  G10K15/00 ,  G10K15/12 ,  H03G9/00 ,  H03H17/00 ,  H03H21/00 ,  H04Q9/00 ,  H04R3/00 ,  H04R27/00 ,  H04S3/00 ,  H04S7/00 ,  H03G3/00

CPC分类号： H03G9/005 ,  H03G9/00 ,  H04R27/00 ,  H04S3/00 ,  H04S7/30 ,  H04S7/305 ,  H04S7/307

摘要： A sound field control unit includes a microphone collecting sound about a self-unit, a collected sound signal input-output terminal for outputting a collected sound signal of the self-unit to outside of the self-unit and inputting a collected sound signal of other units to the self-unit, a collected sound signal switch for switching the collected sound signal collected by the self-unit and that collected by the other units sequentially and repeatedly, an FIR filter for producing a reflected sound component of the collected sound signals provided by the switch and imparting it to the collected sound signals, an amplifier for amplifying the imparted reflected sound component and the collected sound signal, an equalizer provided in a signal path between an output terminal of the collected sound signal switch and an input terminal of the amplifier for adjusting frequency characteristic of a signal flowing through the signal path, and a loudspeaker for reproducing the amplified output signal. These components are assembled integrally together in the self-unit and the self-unit is adapted to be connected to the other units through the collected sound signal input-output terminal by means of transmission cables.

摘要翻译： 声场控制单元包括麦克风收集关于自身单元的声音，收集的声音信号输入输出端子，用于将自身单元的收集的声音信号输出到自身外部，并输入其他的收集的声音信号 单元到自身单元，收集的声音信号开关，用于切换由自身单元收集的收集的声音信号并且被其他单元顺序和重复地收集的声音信号; FIR滤波器，用于产生所提供的所收集的声音信号的反射声音分量 通过开关将其传送到所收集的声音信号，放大器，用于放大所赋予的反射声音分量和收集的声音信号;均衡器，设置在收集的声音信号开关的输出端子和输入端子之间的信号路径中 用于调整流过信号路径的信号的频率特性的放大器，以及用于再现放大的输出信号的扬声器 l。 这些部件在自身单元中整体组装在一起，并且自身单元适于通过传输电缆通过收集的声音信号输入 - 输出端子连接到其他单元。

公开(公告)号：US05999567A

公开(公告)日：1999-12-07

申请号：US741507

申请日：1996-10-31

申请人： Kari Torkkola

发明人： Kari Torkkola

IPC分类号： H03H21/00 ,  H03H7/30 ,  H03H7/40 ,  H03K5/159

CPC分类号： H03H21/0012

摘要： Methods and apparatus for recovering a desired signal from a composite signal. In one method, sample-based information maximization techniques for blind deconvolution are utilized to learn a filter (22) which removes undesired dependencies from the composite signal. Entropy as an expectation over individual samples of the composite signal is maximized. In another method, dependencies of the composite signal are selectively removed by learning a first filter (42) that removes the desired dependencies and outputs a filtered signal. The filtered signal is used as the learning material for a second filter (44) such that the second filter learns to remove only the remaining dependencies (undesired dependencies) from the filtered signal. The composite signal is applied to the second filter (44) which thereby removes the undesired dependencies.

摘要翻译： 从复合信号中恢复所需信号的方法和装置。 在一种方法中，使用用于盲去卷积的基于采样的信息最大化技术来学习从复合信号中去除不期望的依赖性的滤波器（22）。 作为对复合信号的单个样本的期望的熵最大化。 在另一种方法中，通过学习去除期望的依赖性并输出滤波的信号的第一滤波器（42）来选择性地去除复合信号的相关性。 经滤波的信号用作第二滤波器（44）的学习材料，使得第二滤波器学习从滤波信号仅去除剩余的依赖性（不期望的依赖性）。 复合信号被施加到第二过滤器（44），从而消除不期望的依赖性。

公开(公告)号：US5995545A

公开(公告)日：1999-11-30

申请号：US801349

申请日：1997-02-19

申请人： Hiroaki Ueno

发明人： Hiroaki Ueno

IPC分类号： G11B20/10 ,  G11B20/14 ,  G11B20/18 ,  H03H17/02 ,  H03H21/00 ,  H04B3/06 ,  H03K5/159 ,  G06F11/10 ,  H04L27/06

CPC分类号： G11B20/10111 ,  G11B20/10009

摘要： The present invention relates to a signal reproducing method and a signal reproducing apparatus for reproducing a signal recorded by a high-density recording. The invention avoids deteriorating the performance of an ML detector while suppressing the equalization loss and the correlation noise. The signal reproducing method includes steps of generating a first signal using a first selected number of convolutions, generating a second signal using a second selected number of convolutions, and combining the first and second signals to identify the information in the input signal. The first and second signals can be processed by adding or subtracting the first and second signals, depending on the circuit configuration. With this invention, the number of convolution steps is reduced, and it is possible to reduce equalization loss and correlation noise using circuits having a small circuit scale. When applied to a disk drive, it is possible to improve reliability, reduce circuit scale and reduce the size and weight of the drive. It is also possible to obtain a high-density recording due to the reduced error rate realized by this invention.

摘要翻译： 本发明涉及一种用于再现由高密度记录记录的信号的信号再现方法和信号再现装置。 本发明在抑制均衡损失和相关噪声的同时，避免了ML检测器的性能恶化。 信号再现方法包括以下步骤：使用第一选定数量的卷积产生第一信号，使用第二选定数量的卷积产生第二信号，以及组合第一和第二信号以识别输入信号中的信息。 第一和第二信号可以通过根据电路配置加或减第一和第二信号来处理。 利用本发明，卷积步骤的数量减少，并且可以使用电路规模小的电路来减小均衡损耗和相关噪声。 当应用于磁盘驱动器时，可以提高可靠性，降低电路规模，并减小驱动器的尺寸和重量。 由于通过本发明实现的错误率降低，也可以获得高密度记录。

公开(公告)号：US5987143A

公开(公告)日：1999-11-16

申请号：US823367

申请日：1997-03-24

申请人： Takatoshi Okuno ,  Mikio Tohyama ,  Hirofumi Yanagawa

发明人： Takatoshi Okuno ,  Mikio Tohyama ,  Hirofumi Yanagawa

IPC分类号： H03H21/00 ,  H03H17/00 ,  H04B3/23 ,  H04M1/60 ,  H04M9/08 ,  H04B3/20

CPC分类号： H04M9/082

摘要： An acoustic echo erasing apparatus which generates a pseudo-echo component from an audio reception signal (a vector x.sub.1) using an adaptive filter, and removes the pseudo-echo component from an audio transmission signal (a vector y). The apparatus extracts a feedback component depending only on the audio reception signal from the audio transmission signal, and passes the audio reception signal through the adaptive filter to generate the pseudo-echo component while setting a transfer characteristic of the adaptive filter in accordance with the feedback component.

摘要翻译： 一种声学回波消除装置，其使用自适应滤波器从音频接收信号（矢量x1）生成伪回波分量，并从音频传输信号（矢量y）中去除伪回波分量。 该设备仅根据来自音频传输信号的音频接收信号提取反馈分量，并且通过自适应滤波器传递音频接收信号，以产生伪回波分量，同时根据反馈设置自适应滤波器的传输特性 零件。

公开(公告)号：US5987065A

公开(公告)日：1999-11-16

申请号：US882154

申请日：1997-06-25

申请人： Anthony B. Candage

发明人： Anthony B. Candage

IPC分类号： H03H21/00 ,  H03H7/30 ,  H03H7/40 ,  H03K5/159

CPC分类号： H04L25/0268 ,  H03H21/0001

摘要： An equalizer comprising a pair of high pass filters for receiving an input signal, each filter having gain, a first of the filters having gain which is substantially flat within its passband, a second of the filters having gain over a range of its passband which is controlled by an error signal, a differential amplifier for generating the error signal, having an output applied to a control input of the second filter, a pair of broadband amplitude peak detectors each for receiving an output signal of a respective one of the filters, apparatus for applying loop signals derived from outputs of the filters and passing though the peak detectors to corresponding inputs of the differential amplifier, apparatus for providing an offset to a loop signal derived from the output of the first filter, and apparatus for providing an output signal from the output of the second filter.

摘要翻译： 一种均衡器，包括用于接收输入信号的一对高通滤波器，每个滤波器具有增益，滤波器中的第一个具有在其通带内基本上平坦的增益，第二滤波器在其通带的范围内具有增益， 由误差信号控制的差分放大器，用于产生误差信号的差分放大器，具有施加到第二滤波器的控制输入端的输出;一对宽带幅度峰值检测器，每个用于接收各个滤波器的输出信号;装置 用于施加从滤波器的输出导出的环路信号并将峰值检测器通过差分放大器的相应输入端，用于向从第一滤波器的输出导出的环路信号提供偏移的装置，以及用于提供来自 第二个过滤器的输出。

公开(公告)号：US5951626A

公开(公告)日：1999-09-14

申请号：US953120

申请日：1997-10-17

申请人： Donald Lars Duttweiler

发明人： Donald Lars Duttweiler

IPC分类号： H03H17/02 ,  H03H21/00 ,  H04B3/06 ,  G06F17/10

CPC分类号： H03H21/0043 ,  H03H21/0012 ,  H03H2021/0063

摘要： An adaptive filter and method that proportionately adjusts individual tap gain distributors such that the individually adjusted tap gains are not necessarily equal to one another and that the average of tap gains remains substantially constant. The filter employs a proportionate normalized least-means-squares (PNLMS) method of adaptation that imparts improved convergence speed over prior art adaptive filters that utilize a normalized least-means-squares (NLMS) method of adaptation, without affecting the adaptation quality of the filter.

摘要翻译： 一种自适应滤波器和方法，其成比例地调整各个抽头增益分配器，使得单独调整的抽头增益不一定彼此相等，并且抽头增益的平均值基本上保持不变。 滤波器采用适当的归一化最小均值平方（PNLMS）适应方法，相比于现有技术的自适应滤波器，其利用归一化最小均方（NLMS）适应方法提高收敛速度，而不影响适应度 过滤。

公开(公告)号：US5946350A

公开(公告)日：1999-08-31

申请号：US736730

申请日：1996-10-25

申请人： Mitsuru Uesugi

发明人： Mitsuru Uesugi

IPC分类号： H03H21/00 ,  H04B3/10 ,  H04B7/005 ,  H04L25/03 ,  H03H7/30 ,  H03K5/159

CPC分类号： H04L25/03146

摘要： A data receiving system, for equalizing a reception signal by using a decision feedback equalizer when the reception signal is formatted to have a sync signal positioned at the center of a burst, comprises a receiving buffer for storing reception data, training calculation means for obtaining a tap coefficient by performing a training using the sync signal involved in the reception data, a direction selecting means for selecting a preferable direction for a tracking of the decision feedback equalizer, based on a judgement as to which direction is preferable for the decision feedback equalizer between the direction identical with the receiving sequence of the reception data and the direction opposed to the receiving sequence of the reception data, and a tracking calculation means for performing the calculation of the decision feedback equalizer by tracking the reception data along the preferable direction using the tap coefficient given from the training calculation means having executed the training along the preferable direction selected by the direction selecting means. With this arrangement, the decision feedback equalizer can be used in the minimum phase transition which is the most effective condition for the DFE, thereby enhancing the effect of compensating the distortion derived from the multipath fading.

摘要翻译： 一种数据接收系统，用于当接收信号被格式化为具有位于突发中心的同步信号时通过使用判决反馈均衡器对接收信号进行均衡，包括用于存储接收数据的接收缓冲器，用于获得接收信号的训练计算装置 通过使用在接收数据中涉及的同步信号进行训练来进行训练的抽头系数;方向选择装置，用于根据对于决策反馈均衡器的哪个方向优选的判定来选择用于跟踪判决反馈均衡器的优选方向 与接收数据的接收序列和与接收数据的接收序列相反的方向相同的方向，以及跟踪计算装置，用于通过使用抽头跟踪沿着优选方向的接收数据来执行判决反馈均衡器的计算 从具有执行的训练计算装置给出的系数 d沿着由方向选择装置选择的优选方向的训练。 通过这种布置，判决反馈均衡器可以用作DFE最有效条件的最小相位转换，从而增强补偿从多径衰落导出的失真的效果。