专利汇可以提供Frequency modulation communication system and digital carrier generator and demodulator for use therein专利检索,专利查询,专利分析的服务。并且A data transmitter-receiver system for transmitting information over a communication link such as a telephone line is described. The information is encoded on a carrier wave at the transmitter by generating and sending the carrier at one of a plurality of selected frequencies, e.g. two, during successive modulation periods. The carrier wave at the selected frequency is generated by means of a digital wave generator which includes a pulse generator for generating a series of pulses which vary between first and second voltage levels at a pulse repetition rate which is high compared to the carrier wave frequency. A timing signal generator generates timing signals representative selected increments of the carrier wave period at each selected frequency. Gating means having an input connected to the pulse generator and an output is controlled by the timing signal generator for coupling a selected number of pulses to the output thereof during each of the time increments to provide an output signal having an average amplitude in the form of a recurring stair step which digitally simulates a sine or cosine wave. The gating means output signal is coupled to the telephone line via an integrator in the form of a low pass filter so that an analog sine or cosine wave at the selected frequency for each modulation period is transmitted to the receiver. A digital demodulator is provided at the receiver which includes a pulse generator for generating a train of pulses, a counter for counting the time interval of a given portion such as each onehalf of a cycle of the received carrier wave and gating means for coupling a selected number of pulses to an integrator in accordance with the time interval of each one-half cycle of the received carrier wave. The resultant d.c. signal at the integrator output has an amplitude representative of the carrier frequency during each modulation period. A level detector is provided for translating the integrator output signals into binary data.,下面是Frequency modulation communication system and digital carrier generator and demodulator for use therein专利的具体信息内容。
标题 | 发布/更新时间 | 阅读量 |
---|---|---|
实现离散节点间工频信号相位同步检测系统及监测方法 | 2020-05-11 | 649 |
一种纵轴磁悬浮导向控制无差别风力发电系统 | 2020-05-11 | 981 |
一种超声波高压发生系统及方法 | 2020-05-12 | 188 |
一种人机协同模拟演练系统及其方法 | 2020-05-13 | 563 |
一种基于探测信号的3D成像与人体识别方法 | 2020-05-12 | 323 |
一种储罐底部油品泄漏的监测装置及监测方法 | 2020-05-14 | 1003 |
在分解的密集波分复用系统的一致性检查的方法和装置 | 2020-05-14 | 73 |
非易失性存储装置及非易失性存储装置的操作方法 | 2020-05-13 | 158 |
一种基于OCC系统的二维星座辅助CSK传输系统 | 2020-05-12 | 119 |
一种基于多芯光纤传感的多参量同步传感采集仪 | 2020-05-08 | 232 |
高效检索全球专利专利汇是专利免费检索,专利查询,专利分析-国家发明专利查询检索分析平台,是提供专利分析,专利查询,专利检索等数据服务功能的知识产权数据服务商。
我们的产品包含105个国家的1.26亿组数据,免费查、免费专利分析。
专利汇分析报告产品可以对行业情报数据进行梳理分析,涉及维度包括行业专利基本状况分析、地域分析、技术分析、发明人分析、申请人分析、专利权人分析、失效分析、核心专利分析、法律分析、研发重点分析、企业专利处境分析、技术处境分析、专利寿命分析、企业定位分析、引证分析等超过60个分析角度,系统通过AI智能系统对图表进行解读,只需1分钟,一键生成行业专利分析报告。