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1. 发明授权

US5347542A Demodulation selection for a communication signal 失效
标题翻译：通信信号的解调选择
公开(公告)号：US5347542A
公开(公告)日：1994-09-13
申请号：US723288
申请日：1991-06-28
申请人： Christopher N. Kurby , Donald R. Beyer , Anne P. Davies-Walsh , Kevin L. Fluharty , Matthew R. Miller
发明人： Christopher N. Kurby , Donald R. Beyer , Anne P. Davies-Walsh , Kevin L. Fluharty , Matthew R. Miller
IPC分类号： H04L7/04 , H04L27/00 , H04L25/49
CPC分类号： H04L27/0008 , H04L7/041 , H04L7/046
摘要： In a system where 2-level modulation and 4-level modulation of communication signals exist, an apparatus (107) demodulates either modulation scheme by demodulating (301) a received signal under the presumption that it is a 4-level signal, and if the received signal is detected (309) to be a 2-level signal, the signal is then demodulated (319) as a 2-level signal.
摘要翻译：在存在通信信号的2电平调制和4电平调制的系统中，设备（107）在推定为4电平信号的情况下解调（301）接收信号来解调任一调制方案，并且如果检测到接收信号（309）为2电平信号，然后将信号解调（319）作为2电平信号。

2. 发明授权

US5226062A Method and device for detecting multi-level digital signal data stream termination 失效
标题翻译：用于检测多级数字信号数据流终止的方法和装置
公开(公告)号：US5226062A
公开(公告)日：1993-07-06
申请号：US647089
申请日：1991-01-29
申请人： Kevin L. Fluharty
发明人： Kevin L. Fluharty
IPC分类号： H04H20/67 , H04L25/34
CPC分类号： H04H20/67
摘要： A multi-level digital signal data stream termination detector is set forth that utilizes detection of multiple relatively short detection patterns separated by a time less than a predetermined allowable time to detect digital data stream termination even in the presence of simulcast distortion.
摘要翻译：提出了一种多级数字信号数据流终止检测器，其利用检测多个相对较短的检测模式，该检测模式在小于预定的允许时间的时间间隔分离，以便即使存在联播失真也能检测数字数据流终端。

3. 发明授权

US5121411A Multi-edge clock recovery method 失效
标题翻译：多边缘时钟恢复方法
公开(公告)号：US5121411A
公开(公告)日：1992-06-09
申请号：US559878
申请日：1990-07-24
申请人： Kevin L. Fluharty
发明人： Kevin L. Fluharty
IPC分类号： H04L7/033
CPC分类号： H04L7/0334
摘要： A multi-edge clock recovery method is provided that may be used with data streams having at least three (3) levels. According to the invention, when each threshold is crossed, it generates data edges for that particular threshold. These data edges latching the polarity of the recoverd clock at the time the corresponding threshold was crossed, thereby indicating the "late" and "early" edge information for that threshold crossing with respect to the falling edge of the recovered clock. Immediately following the decoding of the most recent multi-level symbol, the appropriate threshold for the data transition is determined. The decoded values of the sumbols preceding and following the data edges determine which threshold should be selected for "late" and "early" edge indications. The recorded late/early data edge status for this selected threshold is then used for determining when it is necessary to correct the phase of the recovered clock. If clock phase correction required, it is done so prior to the next falling edge of recovered clock to avoid corrupting the next "late" or "early" edge data with the "old" phase of recovered clock.
摘要翻译：提供了可以与具有至少三（3）级的数据流一起使用的多边缘时钟恢复方法。根据本发明，当跨越每个阈值时，它产生用于该特定阈值的数据边缘。这些数据边缘在相应的阈值交叉时锁存恢复时钟的极性，从而指示相对于恢复的时钟的下降沿的阈值交叉的“迟”和“早”边信息。在最新的多电平符号解码之后，确定数据转换的适当阈值。在数据边缘之前和之后的sumbols的解码值确定应为“晚”和“早”边缘指示选择哪个阈值。然后，用于该选择的阈值的记录的迟到/早期数据边缘状态用于确定何时需要校正恢复的时钟的相位。如果需要时钟相位校正，则在恢复时钟的下一个下降沿之前完成，以避免在恢复时钟的“旧”阶段破坏下一个“迟”或“早”边缘数据。

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