公开(公告)号：US6032048A

公开(公告)日：2000-02-29

申请号：US818284

申请日：1997-03-17

Applicant: Mac L. Hartless ,  David W. Brown ,  David P. Cullen ,  John V. Hughes ,  Darryl W. Royster

Inventor： Mac L. Hartless ,  David W. Brown ,  David P. Cullen ,  John V. Hughes ,  Darryl W. Royster

IPC: H04B1/10 ,  H04B1/16 ,  H04B15/00

CPC classification number: H04B1/1081 ,  H04B1/1027 ,  H04B1/1661

Abstract: These and other objects of the present invention are achieved using an Adaptive Multi-Path Filter (AMPF) which eliminates audibly objectionable click noise generated at the output of an FM discriminator to prevent audible distortion or other corruption of the desired signal which may include voice and low speed digital data. Clicks are detected at the discriminator output using a colored-noise, matched filter designed and adapted to the click signature/shape as well as to the desired signal characteristics. The colored-noise matched, filter output is then compared to an adaptive threshold. When the threshold is exceeded, a click is registered as detected. Click duration is then estimated. An estimate of the desired signal is generated and that replaces the originally received data signal estimate within the click duration region. Using characteristics of the desired signal just before and after the detected click noise, the adaptive filter accurately estimates the parameters of the desired signal so that the replacement signal fairly models what the desired signal would have looked like had the click not occurred. In this way, a substantial portion of the desired signal is preserved.

Abstract translation: 使用自适应多路径滤波器（AMPF）实现本发明的这些和其它目的，该自适应多路径滤波器（AMPF）消除了在FM鉴频器的输出处产生的可听见的令人反感的点击噪声，以防止可能包含声音和 低速数字数据。 在鉴别器输出端使用彩色噪声匹配滤波器来检测点击，该滤色器设计并适应于点击签名/形状以及所需的信号特征。 然后将有色噪声匹配的滤波器输出与自适应阈值进行比较。 当超过阈值时，检测到点击。 然后估计点击持续时间。 产生期望信号的估计，并且在点击持续时间区域内替换原始接收的数据信号估计。 在检测到的咔嗒声之前和之后使用期望信号的特征，自适应滤波器精确地估计所需信号的参数，使得替换信号相当地模拟了没有发生点击的期望信号。 以这种方式，保留所需信号的大部分。

公开(公告)号：US08503587B2

公开(公告)日：2013-08-06

申请号：US13113445

申请日：2011-05-23

Applicant: Mac L. Hartless

Inventor： Mac L. Hartless

IPC: H03D1/00

CPC classification number: H04L25/0202 ,  H04L25/0214 ,  H04L25/0222 ,  H04L27/00

Abstract: Peak fade depth is measured (202) over a period of time, and a bandwidth of a channel filter (104) is then determined (206) according to the measured peak fade depth (202). In preferred embodiments the average peak fade depth over two or more time slots is used. In a specific embodiment, an α filter (206) is used to determine the bandwidth of the matched filter (104), in which α is determined based upon the measured peak fade depth (204). In various embodiments, peak fade depth is correlated to the Doppler shifting of the channel, which in turn is used to determine the bandwidth of the matched filter by way of the α parameter. Hence, a non-linear equation can be used to determine the value of α which yields a minimum bit error rate for the matched filter (104). More specifically, a matched filter (104) is matched to a received signal r(t) having k states according to a plurality of matched filters Mk and outputs a signal given by |r(t)−Ck(t)*Mk(t)|2, in which Ck(t) is a channel estimate provide by a channel tracker (106) for a state k at time period t that is given by Ck(t)=α*ck(t)+(1−α)*Ck(t−1), ck(t)=Mk*r(t)/(Mk*conj(Mk)), and conj(Mk) is the complex conjugate of Mk. For each time slot, α is computed from the running average of the peak fade depth (202) according to a predetermined equation (204).

Abstract translation: 在一段时间内测量峰值衰落深度（202），然后根据测量的峰值衰落深度（202）确定通道滤波器（104）的带宽（206）。 在优选实施例中，使用两个或多个时隙上的平均峰值衰减深度。 在一个具体实施例中，α滤波器（206）用于确定匹配滤波器（104）的带宽，其中基于所测量的峰值衰落深度（204）确定α。 在各种实施例中，峰值衰落深度与信道的多普勒频移相关，其又用于通过α参数来确定匹配滤波器的带宽。 因此，可以使用非线性方程来确定α的值，其产生匹配滤波器的最小误码率（104）。 更具体地，匹配滤波器（104）与根据多个匹配滤波器Mk的具有k个状态的接收信号r（t）匹配，并输出由| r（t）-Ck（t）* Mk（t）给出的信号 ）| 2，其中C k（t）是信道跟踪器（106）针对时间段t处的状态k提供的信道估计，其由Ck（t）=α* ck（t）+（1-α ）* Ck（t-1），ck（t）= Mk * r（t）/（Mk * conj（Mk）），conj（Mk）是Mk的复共轭。 对于每个时隙，根据预定等式（204）从峰值衰落深度（202）的运行平均值计算α。

公开(公告)号：US20120300821A1

公开(公告)日：2012-11-29

申请号：US13113445

申请日：2011-05-23

Applicant: Mac L. Hartless

Inventor： Mac L. Hartless

IPC: H04B17/00

CPC classification number: H04L25/0202 ,  H04L25/0214 ,  H04L25/0222 ,  H04L27/00

Abstract: Peak fade depth is measured (202) over a period of time, and a bandwidth of a channel filter (104) is then determined (206) according to the measured peak fade depth (202). In preferred embodiments the average peak fade depth over two or more time slots is used. In a specific embodiment, an α filter (206) is used to determine the bandwidth of the matched filter (104), in which α is determined based upon the measured peak fade depth (204). In various embodiments, peak fade depth is correlated to the Doppler shifting of the channel, which in turn is used to determine the bandwidth of the matched filter by way of the α parameter. Hence, a non-linear equation can be used to determine the value of α which yields a minimum bit error rate for the matched filter (104). More specifically, a matched filter (104) is matched to a received signal r(t) having k states according to a plurality of matched filters Mk and outputs a signal given by |r(t)−Ck(t)*Mk(t)|2, in which Ck(t) is a channel estimate provide by a channel tracker (106) for a state k at time period t that is given by Ck(t)=α*ck(t)+(1−α)*Ck(t−1), ck(t)=Mk*r(t)/(Mk*conj(Mk)), and conj(Mk) is the complex conjugate of Mk. For each time slot, α is computed from the running average of the peak fade depth (202) according to a predetermined equation (204).

Abstract translation: 在一段时间内测量峰值衰落深度（202），然后根据测量的峰值衰落深度（202）确定通道滤波器（104）的带宽（206）。 在优选实施例中，使用两个或多个时隙上的平均峰值衰减深度。 在具体实施例中，α滤波器（206）用于确定匹配滤波器（104）的带宽，其中α基于测量的峰值衰落深度（204）来确定。 在各种实施例中，峰值衰落深度与信道的多普勒频移相关，其又用于通过α参数来确定匹配滤波器的带宽。 因此，可以使用非线性方程来确定α的值，其产生匹配滤波器（104）的最小误码率。 更具体地，匹配滤波器（104）与根据多个匹配滤波器Mk的具有k个状态的接收信号r（t）匹配，并输出由| r（t）-Ck（t）* Mk（t）给出的信号 ）| 2，其中Ck（t）是由时间段t由通道C（t）=α* ck（t）+（1-α）给出的通道跟踪器（106）提供的信道估计 ）* Ck（t-1），ck（t）= Mk * r（t）/（Mk * conj（Mk）），conj（Mk）是Mk的复共轭。 对于每个时隙，根据预定等式（204）从峰值衰落深度（202）的运行平均值计算α。

公开(公告)号：US4860373A

公开(公告)日：1989-08-22

申请号：US845961

申请日：1986-03-31

Applicant: Mac L. Hartless ,  Alan L. Johnson

Inventor： Mac L. Hartless ,  Alan L. Johnson

IPC: G06T5/00 ,  H03H17/02

CPC classification number: H03H17/0202 ,  G06T7/0081

Abstract: A location dependent signal processor for radiant energy detector arrays which include two-dimensional spatial filtering and/or background normalizing, with means providing programmed control of the signal processor filter weighting and normalizer thresholding operations as a function of the location of each successive output pixel with respect to the periphery of the detector array, so as to enable the signal processor to minimize the effects of initialization and wrap-around pixels on the processor signal output.

Abstract translation: 用于辐射能量检测器阵列的位置相关信号处理器，其包括二维空间滤波和/或背景归一化，其中装置提供信号处理器滤波器加权和归一化器阈值操作的编程控制，作为每个连续输出像素的位置的函数， 相对于检测器阵列的周边，以便使得信号处理器能够最小化初始化和环绕像素对处理器信号输出的影响。