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    • 24. 发明授权
    • Continuous integration digital demodulator for use in a communication
device
    • 用于通信设备的连续集成数字解调器
    • US5949827A
    • 1999-09-07
    • US934404
    • 1997-09-19
    • Michael J. DeLucaEmilio J. Quiroga
    • Michael J. DeLucaEmilio J. Quiroga
    • H04L25/06H04L27/14
    • H04L25/061
    • A digital demodulator (100) for use in a communication device comprising a mixer (110) which samples a limited IF signal derived from a received radio frequency (RF) signal at a rate less than a Nyquist rate of the limited IF signal and generates a resulting IF signal. A continuous integrator (130) is connected to the mixer (110) and integrates the resulting IF signal over a predetermined number of samples thereof to generate a numerical value representative of a modulation frequency of a limited IF signal. An adaptive peak-valley bit slicer (150) is connected to the continuous integrator (130) and compares each numerical value with a peak threshold, a valley threshold and a mid threshold and generates most-significant-bit (MSB) and least-significant-bit (LSB) values for each sample. The adaptive peak-valley bit slicer (150) adjusts the peak and valley thresholds for use in determining a level of a current numerical value based on the LSB and MSB values determined for a prior sample of the numerical value.
    • 一种用于通信设备的数字解调器(100),包括:混合器(110),其以小于受限IF信号的奈奎斯特速率的速率从接收到的射频(RF)信号中得到的有限IF信号进行采样, 产生IF信号。 连续积分器(130)连接到混频器(110),并将所得IF信号在预定数量的采样上积分,以产生表示有限IF信号的调制频率的数值。 自适应峰谷位限幅器(150)连接到连续积分器(130),并将每个数值与峰值阈值,谷值阈值和中间阈值进行比较,并产生最高有效位(MSB)和最小有效位 (LSB)值。 自适应峰谷位限幅器(150)基于为数值的先前样本确定的LSB和MSB值来调整用于确定当前数值的电平的峰谷阈值。
    • 28. 发明授权
    • Selective call signalling system
    • 选择性呼叫信令系统
    • US5128665A
    • 1992-07-07
    • US701339
    • 1991-05-10
    • Michael J. DeLucaGregory O. SnowdenRobert J. SchwendemanLeon Jasinski
    • Michael J. DeLucaGregory O. SnowdenRobert J. SchwendemanLeon Jasinski
    • G08B5/22H04W88/18
    • H04W88/187G08B5/227
    • A paging system has a signal for transmitting a variable amount of messages to paging receivers. The signal has a synchronization signal, an address field, an information and a boundary signal indicative of the boundary between the address field and the information field. Each message has addresses which are included within the address field and may have message information which is included in the information field. The information field includes two portions, a first portion having a plurality of packets for holding a predetermined amount of information and a second portion for holding a variable amount of information. If the information associated with a messasge is less than the predetermined amount, the message information is stored in the first portion of the information field. If the message information is greater than the predetermined amount, it is stored in the first and second portions of information field and a vector signal indicating the location of the message information is stored in the first information field. The first portion further includes at least one check signal which provides parity for a plurality of packets. Methods of generating the message signal, receiving a message, displaying a message and conserving power during the reception of a message are described.
    • 寻呼系统具有用于向寻呼接收机发送可变量的消息的信号。 信号具有指示地址字段和信息字段之间的边界的同步信号,地址字段,信息和边界信号。 每个消息具有包括在地址字段内的地址,并且可以具有包括在信息字段中的消息信息。 信息字段包括两部分,第一部分具有用于保持预定量信息的多个分组,以及用于保存可变量信息的第二部分。 如果与消息相关联的信息小于预定量,则消息信息被存储在信息字段的第一部分中。 如果消息信息大于预定量,则将其存储在信息字段的第一和第二部分中,并且指示消息信息的位置的向量信号被存储在第一信息字段中。 第一部分还包括提供多个分组的奇偶校验的至少一个检查信号。 描述了在接收消息期间生成消息信号,接收消息,显示消息和节省功率的方法。