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1. 发明授权

US6032048A Method and apparatus for compensating for click noise in an FM receiver 失效
标题翻译：用于补偿FM接收机中的点击噪声的方法和装置
公开(公告)号：US6032048A
公开(公告)日：2000-02-29
申请号：US818284
申请日：1997-03-17
申请人： Mac L. Hartless , David W. Brown , David P. Cullen , John V. Hughes , Darryl W. Royster
发明人： Mac L. Hartless , David W. Brown , David P. Cullen , John V. Hughes , Darryl W. Royster
IPC分类号： H04B1/10 , H04B1/16 , H04B15/00
CPC分类号： H04B1/1081 , H04B1/1027 , H04B1/1661
摘要： 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.
摘要翻译：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。

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