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公开(公告)号:US4578533A
公开(公告)日:1986-03-25
申请号:US580279
申请日:1984-02-17
申请人: O. Leon Pierce
发明人: O. Leon Pierce
摘要: A modem for coupling a data terminal or other apparatus to a telephone line and deriving its operating power for both transmitting and receiving operation from the telephone line, and providing electrical isolation between the telephone line and the data terminal. The modem is switchable to provide orginate or answer operation in either of two operating frequency bands.
摘要翻译: 一种调制解调器,用于将数据终端或其他设备耦合到电话线路,并从电话线路获得用于发送和接收操作的操作功率,以及在电话线路和数据终端之间提供电气隔离。 调制解调器可切换到在两个工作频带中的任何一个频带提供最终或应答操作。
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公开(公告)号:US4594727A
公开(公告)日:1986-06-10
申请号:US455855
申请日:1983-01-05
申请人: O. Leon Pierce
发明人: O. Leon Pierce
IPC分类号: H04L27/227 , H04L27/22
CPC分类号: H04L27/2276
摘要: A synchronous receiver for receiving a phase shift modulated signal having binary data at a clock rate occurring within a baud interval. The synchronous receiver provides multiple estimates of the signal phase during selected portions of the baud interval, wherein the resulting phase values are averaged to provide a data output of low error rate and high reliability. The synchronous receiver of the present invention independently recovers the carrier and clock signals by separate digital phase-locked loops, wherein the resulting signals are used by the synchronous detector portion to recover the digital data. Moreover, the data acquisition time is improved by variable bandwidth characteristics of the phase locked loops.
摘要翻译: 一种同步接收机,用于以波特率间隔内出现的时钟速率接收具有二进制数据的相移调制信号。 同步接收器在波特率间隔的选定部分期间提供信号相位的多个估计,其中所得到的相位值被平均以提供低误码率和高可靠性的数据输出。 本发明的同步接收机通过单独的数字锁相环独立地恢复载波和时钟信号,其中所产生的信号由同步检测器部分用于恢复数字数据。 此外,通过锁相环的可变带宽特性来提高数据采集时间。
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公开(公告)号:US4417099A
公开(公告)日:1983-11-22
申请号:US203110
申请日:1980-11-03
申请人: O. Leon Pierce
发明人: O. Leon Pierce
IPC分类号: H03K17/795 , H04L25/26 , H04M19/08 , H03K3/42
CPC分类号: H03K17/7955 , H04L25/26 , H04M19/08
摘要: An electro-optical isolator circuit especially adapted for operation in a modem which is powered solely from the telephone line and employed to isolate the line from utilization equipment. The isolator includes a guard circuit which substantially improves low current operating speed such that an inexpensive electro-optical component can be utilized at very low drive levels to achieve response times less than 10 microseconds.
摘要翻译: 一种电光隔离器电路,特别适用于调制解调器中的操作,该调制解调器仅由电话线供电并用于将线路与利用设备隔离。 隔离器包括保护电路,其大大改善了低电流操作速度,使得可以以非常低的驱动电平利用廉价的电光部件来实现小于10微秒的响应时间。
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公开(公告)号:US4395590A
公开(公告)日:1983-07-26
申请号:US203108
申请日:1980-11-03
申请人: O. Leon Pierce , Mark C. Smith , R. Byron Driver
发明人: O. Leon Pierce , Mark C. Smith , R. Byron Driver
CPC分类号: H04M11/06
摘要: A modem for coupling a data terminal or other apparatus to a telephone line and deriving its operating power for both transmitting and receiving operation from the telephone line, and providing electrical isolation between the telephone line and the data terminal.
摘要翻译: 一种调制解调器,用于将数据终端或其他设备耦合到电话线路,并从电话线路获得用于发送和接收操作的操作功率,以及在电话线路和数据终端之间提供电气隔离。
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公开(公告)号:US4373117A
公开(公告)日:1983-02-08
申请号:US203109
申请日:1980-11-03
申请人: O. Leon Pierce
发明人: O. Leon Pierce
CPC分类号: H04M19/08
摘要: A DC to DC converter circuit for use in a telephone line powered modem and operative to convert a voltage derived from the telephone line to operating voltages required for modem operation.
摘要翻译: 一种DC-DC转换器电路,用于电话线路供电的调制解调器,并且可操作地将从电话线路导出的电压转换为调制解调器操作所需的工作电压。
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