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    • 83. 发明授权
    • Automode signal detection in full duplex modems
    • 全双工调制解调器中的自动编码信号检测
    • US5309476A
    • 1994-05-03
    • US766881
    • 1991-09-26
    • Jack T. MurrayGottfried UngerboeckMalcolm S. Ware
    • Jack T. MurrayGottfried UngerboeckMalcolm S. Ware
    • H04L27/00H04L27/22H04L5/16
    • H04L27/0012
    • Method and apparatus for determining occurrence of an S1 modem identification sequence is disclosed. An S1 sequence is found to exist when the sum of conjugate complex multiplication of signal sample amplitudes taken at an interval T/2 result in a negative scalar value for an arbitrary number of sequential occurrences. Complex samples taken from incoming baseband waveform at twice the modulation rate are interleaved in pairs of two with two even numbered samples and two odd numbered samples being considered separately by first performing complex multiplication followed by scalar multiplication of an output of the complex multiplication and an output of the previous complex multiplication delayed by one modulation interval T. The separate results from the sets of pairs of signal samples are summed to form a scalar whose value when consistently less than 0 indicates the presence of an S1 modem identification sequence in accordance with the CCITT S1 recommendation.
    • 公开了一种用于确定S1调制解调器识别序列的发生的方法和装置。 当以间隔T / 2获取的信号样本幅度的共轭复数乘法的和导致任意数量的连续出现的负标量值时,发现S1序列存在。 以两倍于调制速率的入局基带波形采集的复杂样本以两个偶数编号的采样成对进行交织,并且通过首先执行复乘乘以复乘乘法的输出的标量乘法和输出 前一个复数乘法延迟一个调制间隔T.来自信号样本对组的单独结果相加以形成一个标量,其值一直小于0表示存在根据CCITT的S1调制解调器识别序列 S1推荐。