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    • 72. 发明授权
    • Communication of a voice signal via continuous quadrature amplitude
modulator
    • 通过连续正交幅度调制器对语音信号进行通信
    • US5081647A
    • 1992-01-14
    • US294167
    • 1989-01-06
    • Gordon Bremer
    • Gordon Bremer
    • H04L27/36
    • H04L27/36
    • A method and apparatus for communicating a voice conversation over a single telephone channel using continuously variable level quadrature amplitude modulation establishes and maintains two totally independent communication paths, each near perfect in amplitude and phase with respect to frequency over a bandwidth suitable for communication of continuously variable amplitude pulses. These pulses may be representations of any suitable bandlimited analog signal. The method establishes almost flawless QAM channels (real, imaginary), then allows switching to continuously variable amplitude analog transmissions.
    • 一种用于使用连续可变电平正交幅度调制在单个电话信道上传送话音会话的方法和装置建立并维持两个完全独立的通信路径,每个路径在幅度和相位上相对于在适于通信连续变量 振幅脉冲。 这些脉冲可以是任何合适的带限模拟信号的表示。 该方法建立了几乎完美的QAM通道(实数,虚数),然后允许切换到连续可变幅度模拟传输。
    • 73. 发明授权
    • Method and system for a synchronized pseudo-random privacy modem
    • 同步伪随机隐私调制解调器的方法和系统
    • US4924516A
    • 1990-05-08
    • US356080
    • 1989-05-23
    • Gordon BremerWilliam L. Betts
    • Gordon BremerWilliam L. Betts
    • H04K1/00H04L27/34
    • H04L27/3472H04K1/00
    • A method and system for a synchronized pseudorandom privacy modem makes use of a pseudorandom signal generator to index into a table of N signal spaces thereby altering gain and phase modifiers so or to modify both the gain and phase of portions of the data signal being transmitted from a QAM modem and thus transmit an encrypted signal pattern to the other end of the communications channel. The modem transmitter circuit includes a data scrambler, and QAM signal point mapper, connected in series, as well as a pair of mixers having inputs from the pseudorandom signal generator and functioning to modify the gain and phase of portions of the QAM signal point mapper output signal before they are pulse amplitude modulated, filtered, converted to analog form, and transmitted over the communications channel. Complementary circuit elements in the receiver, which have been synchronized with those of the transmitter by baud rate counters at both locations, demodulate and decode the received encrypted signal.
    • 用于同步伪随机隐私调制解调器的方法和系统利用伪随机信号发生器来索引到N个信号空间的表中,从而改变增益和相位修改器,从而改变从...传送的数据信号的部分的增益和相位 QAM调制解调器,从而将加密的信号模式发送到通信信道的另一端。 调制解调器发送器电路包括串联连接的数据扰频器和QAM信号点映射器,以及具有来自伪随机信号发生器的输入的一对混频器,并用于修改QAM信号点映射器输出部分的增益和相位 信号在它们被脉冲幅度调制,滤波,转换成模拟形式之前,并通过通信信道传输。 接收机中的互补电路元件与两个位置的波特率计数器与发送器的那些同步,对接收到的加密信号进行解调和解码。
    • 75. 发明授权
    • QAM encoder
    • QAM编码器
    • US4525847A
    • 1985-06-25
    • US440500
    • 1982-11-10
    • Gordon Bremer
    • Gordon Bremer
    • H04L27/36H04L27/20
    • H04L27/365
    • This invention describes a QAM encoder which makes use of memory means to generate the desired QAM signals. Each QAM signal corresponds to a group of bits which are defined by an angle on a standard eye-pattern. Each group is passed serially through delay circuits and at the output of each delay circuit there are look-up circuits which select a number from the memory which is a product of the sine of the angle of the group as modified by a sampling signal and a coefficient. These coefficients correspond to the coefficients of the standard transversal digital filter. The numbers generated by each look-up circuit are added to generate the output signals.
    • 本发明描述了一种利用存储装置产生所需QAM信号的QAM编码器。 每个QAM信号对应于由标准眼图上的角度定义的一组位。 每个组通过延迟电路串行通过,并且在每个延迟电路的输出处有查找电路,其从存储器中选择一个数字,其是通过采样信号修改的组的角度的正弦的乘积,以及 系数。 这些系数对应于标准横向数字滤波器的系数。 添加由每个查找电路产生的数字以产生输出信号。