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9 条记录 (耗时 0.02 秒)

    Multi-channel signal separation
    1.
    发明授权
    Multi-channel signal separation 失效
    多通道信号分离

    公开(公告)号：US5208786A

    公开(公告)日：1993-05-04

    申请号：US750917

    申请日：1991-08-28

    申请人： Ehud Weinstein ,  Meir Feder ,  Alan V. Oppenheim

    发明人： Ehud Weinstein ,  Meir Feder ,  Alan V. Oppenheim

    IPC分类号： G06K9/62 ,  G10L21/02 ,  H04R3/00

    CPC分类号： G06K9/6243 ,  G10L21/0272 ,  H03H2021/0034 ,  H04R3/005 ,  Y10S367/901

    摘要： A system separates unknown signals which have been combined together through unknown linear filters and for which observations at multiple sensors are made. In a two channel circuit with two inputs and two sensors, the reconstructed source signals are assumed to be decorrelated such that the cross-correlation between the reconstructed source signals is near zero. The transfer functions which represent the crosstalk processes are estimated. The output signals are detected and the transfer functions are recursively solved. A reconstruction filter is used to recover the original input signals.

    摘要翻译： 系统通过未知的线性滤波器分离已经组合在一起的未知信号，并且在多个传感器处进行观测。 在具有两个输入和两个传感器的双通道电路中，假设重建的源信号是去相关的，使得重构的源信号之间的互相关接近零。 估计表示串扰过程的传递函数。 检测输出信号，递归地解决传递函数。 重构滤波器用于恢复原始输入信号。

    Correlation shaping matched filter receiver
    3.
    发明授权
    Correlation shaping matched filter receiver 失效
    相关整形匹配滤波接收机

    公开(公告)号：US07751469B2

    公开(公告)日：2010-07-06

    申请号：US09788890

    申请日：2001-02-20

    申请人： Yonina C. Eldar ,  Alan V. Oppenheim

    发明人： Yonina C. Eldar ,  Alan V. Oppenheim

    IPC分类号： H04B1/707

    CPC分类号： H04B1/7093 ,  G06K9/62 ,  H04B1/71052 ,  H04L25/03299

    摘要： The present invention is directed toward an apparatus and method for receiving signals, demodulating the signals and shaping the correlation of the output of a correlation demodulator. The present invention can be used irrespective of whether the received signals have noise components that are Gaussian or non-Gaussian. Moreover, the present invention can be utilized when a predetermined set of received signals is linearly independent or linearly dependent.

    摘要翻译： 本发明涉及一种用于接收信号，解调信号和整形相关解调器的输出的相关性的装置和方法。 可以使用本发明，而不管接收的信号是否具有高斯或非高斯的噪声分量。 此外，当预定的一组接收信号是线性独立的或线性相关的时，可以利用本发明。

    Hybrid analog/digital signal coding
    4.
    发明授权
    Hybrid analog/digital signal coding 失效
    混合模拟/数字信号编码

    公开(公告)号：US06441764B1

    公开(公告)日：2002-08-27

    申请号：US09565102

    申请日：2000-05-05

    申请人： Richard Barron ,  Alan V. Oppenheim

    发明人： Richard Barron ,  Alan V. Oppenheim

    IPC分类号： H03M112

    CPC分类号： G10L19/0208 ,  G10L19/008 ,  H04H20/22 ,  H04H20/95 ,  H04H2201/20

    摘要： An apparatus and method for subband signal coding, using algorithms of comparable complexity to conventional coders, that exploits a noisy analog signal at the decoder. It is assumed that the analog signal is the output of a channel through which the source is sent uncoded. By using the analog signal at the receiver, the required digital bit rate is able to be reduced while offering comparable fidelity to conventional coding systems that ignore the analog signal. Concepts from conventional subband coding, e.g., subband decomposition, quantization, bit allocation, and lossless bitstream coding, are tailored to exploit the analog signal at the receiver such that frequency-weighted mean-squared error (MSE) is minimized. Because subband coefficients are coded, all results pertaining to perceptual masking are easily applied to this method of coding. The invention is directed to a signal coding solution for a hybrid channel that is the composition of two channels: a noisy analog channel through which a signal source is sent unprocessed and a secondary rate-constrained digital channel. The source is processed prior to transmission through the digital channel.

    摘要翻译： 一种用于子带信号编码的装置和方法，使用与传统编码器相当的复杂度的算法，其利用解码器处的噪声模拟信号。 假设模拟信号是未经编码的源发送的信道的输出。 通过在接收机处使用模拟信号，可以减少所需的数字比特率，同时提供与忽略模拟信号的传统编码系统相当的保真度。 针对来自常规子带编码（例如子带分解，量化，位分配和无损码流编码）的概念被定制以利用接收机处的模拟信号，使得频率加权均方误差（MSE）被最小化。 因为子带系数被编码，所以与感知掩蔽相关的所有结果都容易应用于这种编码方法。 本发明涉及用于混合信道的信号编码解决方案，该混合信道是两个信道的组合：噪声模拟信道，未经处理的信号源被发送到第二速率受限数字信道。 在通过数字通道传输之前对源进行处理。

    Communication system utilizing self-similar signals
    5.
    发明授权
    Communication system utilizing self-similar signals 失效
    使用自相似信号的通信系统

    公开(公告)号：US5285478A

    公开(公告)日：1994-02-08

    申请号：US786003

    申请日：1991-10-31

    申请人： Gregory W. Wornell ,  Alan V. Oppenheim

    发明人： Gregory W. Wornell ,  Alan V. Oppenheim

    IPC分类号： H04K3/00 ,  H04L1/04 ,  H04L27/00

    CPC分类号： H04K3/25 ,  H04K3/827 ,  H04L1/04

    摘要： A communication system is provided in which a transmitter performs modulation upon a number sequence to be transmitted. The modulation scheme includes embedding a sequence of numbers into a waveform such that the sequence is present in the waveform on multiple time scales. The transmitted waveform has a selected number of different frequency bands of successively doubling bandwidths. Each of the frequency bands includes the sequence of numbers, repeated therein at a certain rate. The rate is directly proportional to the bandwidth of the frequency band. The communication system further includes a receiver designed to average the value of the repeated sequence as received by the receiver. This scheme allows for accurate communication over noisy, uncertain, and/or hostile channels in both point to point and broadcast communication applications.

    摘要翻译： 提供了一种通信系统，其中发射机对要传输的数字序列进行调制。 调制方案包括将数字序列嵌入到波形中，使得序列以多个时间尺度存在于波形中。 传输的波形具有选定数量的连续倍频带宽的不同频带。 每个频带包括数字序列，以一定速率重复。 速率与频带的带宽成正比。 通信系统还包括设计用于平均由接收机接收的重复序列的值的接收机。 该方案允许在点对点和广播通信应用中的噪声，不确定和/或敌对信道上的准确通信。

    Correlation shaping multi-signature receiver
    7.
    发明授权
    Correlation shaping multi-signature receiver 有权

    公开(公告)号：US07636403B2

    公开(公告)日：2009-12-22

    申请号：US09888762

    申请日：2001-06-25

    申请人： Yonina C. Eldar ,  Alan V. Oppenheim

    发明人： Yonina C. Eldar ,  Alan V. Oppenheim

    IPC分类号： H04L27/06

    CPC分类号： H04B1/7093 ,  H04B1/7097 ,  H04B2001/70935

    摘要： A receiver for and method of processing received signals comprising a linear combination of a plurality of signature signals having undergone some distortion. The receiver is comprised of a bank of correlators for receiving the signals, and a correlation shaper operating on a vector output from the bank of correlators. The bank of correlators may comprise a matched filter receiver or a decorrelator receiver. Optionally, a bank of detectors may operate on the vector output of the correlation shaper.

    Communication using synchronized chaotic systems
    9.
    发明授权
    Communication using synchronized chaotic systems 失效
    通信使用同步混沌系统

    公开(公告)号：US5291555A

    公开(公告)日：1994-03-01

    申请号：US989703

    申请日：1992-12-14

    申请人： Kevin M. Cuomo ,  Alan V. Oppenheim

    发明人： Kevin M. Cuomo ,  Alan V. Oppenheim

    IPC分类号： H04K1/02 ,  H04L27/00 ,  H04L9/28

    CPC分类号： H04L27/001 ,  H04K1/025

    摘要： A chaotic transmitter (100) operates according to preselected chaotic protocols, such as a set of Lorenz equations. Modulation is accomplished by modifying a predetermined parameter of the set of chaotic Lorenz equations with a message signal, thereby producing a spread spectrum chaotic transmitted signal. A corresponding receiver (200) reconstructs a synchronizing drive signal, which is used by a demodulator (412) of the receiver (200) to detect the message signal.

    摘要翻译： 混沌发射机（100）根据预选的混沌协议（例如一组洛伦兹方程）进行操作。 通过用消息信号修改该组混沌洛伦兹方程组的预定参数来实现调制，由此产生扩频混沌发射信号。 对应的接收机（200）重构由接收器（200）的解调器（412）使用以检测消息信号的同步驱动信号。