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1. 发明授权

US3804988A Carrier system for efficient connection of telephone subscribers to central office 失效
标题翻译：电话系统有效连接电视台到中央办公室
公开(公告)号：US3804988A
公开(公告)日：1974-04-16
申请号：US27173772
申请日：1972-07-14
申请人： CARRIER TEL CORP AMERICA INC
发明人： BROWNE S
IPC分类号： H04J1/00 , H04J1/02 , H04J1/08 , H04J1/18 , H04M3/00 , H04Q3/60 , H04Q11/02 , H04J1/06
CPC分类号： H04J1/18 , H04J1/08 , H04Q11/02
摘要： Multiple adjacent frequency channels employ single sideband AM transmission to afford optimized shared utilization of a common telephone transmission line while adhering to a station carrier frequency standard in which the carriers transmitted from subscribers to the central office reside in a different frequency band than carriers transmitted from the central office to subscribers. In one embodiment, requiring only a single oscillator per channel, each sideband is transmitted with its carrier; further, each subscriber carrier is an integral submultiple of the central office carrier for that channel and is obtained by frequency division of the central office carrier. In a second embodiment a common IF oscillator at the central office is used for modulation and detection, permitting identical IF filters to be employed in each channel. In a third embodiment the concepts of the first two embodiments are combined to require only a single oscillator per channel and to permit utilization of standard filters in each channel.
摘要翻译：多个相邻频率信道采用单边带AM传输来提供公共电话传输线路的优化的共享利用，同时遵守从载波从用户发送到中心局的载波驻留在不同频带的载波频率标准，中心局给用户。在一个实施例中，每个通道仅需要单个振荡器，每个边带与其载波一起发送; 此外，每个用户载波是该信道的中心局载波的整数子倍数，并且通过中心局载波的分频获得。在第二实施例中，中央局的公共IF振荡器用于调制和检测，允许在每个通道中采用相同的IF滤波器。在第三实施例中，前两个实施例的概念被组合以仅需要每个通道单个振荡器，并且允许在每个通道中利用标准滤波器。

2. 发明授权

US3806655A System carrier equipment employing phase shift method of ssb generation and reception 失效
标题翻译：使用SSB生成和接收的相位移动方法的系统载体设备
公开(公告)号：US3806655A
公开(公告)日：1974-04-23
申请号：US27173872
申请日：1972-07-14
申请人： CARRIER TEL CORP AMERICA INC
发明人： HEKIMIAN N , BROWNE S , MURTHA J
IPC分类号： H04J1/00 , H04J1/02 , H04J1/08 , H04J1/18 , H04M3/00 , H04Q3/60 , H04Q11/02 , H04J1/06
CPC分类号： H04J1/18 , H04J1/08 , H04Q11/02
摘要： Multiple adjacent frequency channels employ single sideband AM transmission with re-inserted carrier to afford optimized shared utilization of a common telephone transmission line while adhering to a station carrier frequency standard in which the carriers transmitted from subscribers to the central office reside in a different frequency band than carriers transmitted from the central office to subscribers. The system uses only one stable oscillator per channel, with all other oscillatory signals synchronized thereby. In a preferred embodiment, each subscriber carrier is an integral sub-multiple of the central office carrier for that channel and is obtained by frequency division of the central office carrier. Filtering requirements are minimized by using the phase shift method of SSB generation and reception.
摘要翻译：多个相邻频率信道采用具有重新插入载波的单边带AM传输，以便在遵守从载波从中心局发送到中心局的载波驻留在不同频带中的载波频率标准的同时提供公共电话传输线路的优化的共享利用而不是从中心局向用户传送的运营商。该系统每个通道只使用一个稳定振荡器，所有其他振荡信号由此同步。在优选实施例中，每个用户载波是该信道的中心局载波的整数子倍数，并且通过中心局载波的分频获得。通过使用SSB生成和接收的相移方法来最小化滤波要求。

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