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公开(公告)号：US4492824A
公开(公告)日：1985-01-08
申请号：US522106
申请日：1983-08-11
申请人： Steve W. Bell , Milton L. Embree
发明人： Steve W. Bell , Milton L. Embree
CPC分类号： H04M9/10
摘要： There is disclosed a precision linear comparator for a speakerphone circuit having two rectifying constant voltage nodes for separately summing two groups of signals derived from a speakerphone transmit channel and receive channel and supplying at an output terminal a signal representative of the difference between two unblocked summed signals. Each node blocks its summed signal if the signal is not representative of a true voice signal. A null signal is supplied at the output terminal during the absence of unblocked summed signals.
摘要翻译： 公开了一种用于具有两个整流恒压节点的扬声器电话的精密线性比较器，用于分别对从扬声器电话发射信道和接收信道导出的两组信号进行求和，并在输出端提供表示两个未阻塞求和信号之间的差异的信号 。 如果信号不代表真实的语音信号，则每个节点阻塞其求和信号。 在没有阻塞的求和信号的情况下，在输出端提供空信号。
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公开(公告)号：US4305071A
公开(公告)日：1981-12-08
申请号：US140714
申请日：1980-04-16
CPC分类号： G06F3/042 , G06F3/037 , G06F3/0421
摘要： In certain situations it is necessary to detect a slight change in a continuous wave signal and to be able to specifically determine the exact position of the change. This is especially necessary in situations where a continuously changing signal (with respect to time) is generated and where it is necessary to determine, at a particular instant of time, any change in the signal from a previous corresponding instant of time. Where the signal is periodic in nature and substantially repeatable between cycles it is possible to establish a memory data base of signal levels as a function of time. Comparisons can then be made on successive cycle against the known, or precalculated data base. Changes between the data base and the new signal result give a positive signal change indication.
摘要翻译： 在某些情况下，有必要检测连续波信号的轻微变化，并能够具体确定变化的确切位置。 这在生成连续变化的信号（相对于时间）的情况下以及需要在特定时刻确定来自先前相应时刻的信号的任何变化的情况下尤其如此。 在信号本质上是周期性的并且在周期之间基本可重复的情况下，可以建立作为时间的函数的信号电平的存储器数据库。 然后可以针对已知或预先计算的数据库在连续循环上进行比较。 数据库与新信号结果之间的变化给出了一个正的信号变化指示。
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