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    • 7. 发明申请
    • BLOCK SPECTRUM RECEIVER FOR A BROADBAND COMMUNICATIONS SYSTEM
    • 用于宽带通信系统的块频率接收器
    • WO1997036390A1
    • 1997-10-02
    • PCT/US1997005145
    • 1997-03-26
    • SCIENTIFIC-ATLANTA, INC.
    • SCIENTIFIC-ATLANTA, INC.MILLER, Kevin, L.BORAZJANI, Ramin
    • H04H01/06
    • H04H20/80H04H20/34H04H20/42H04H20/79H04H40/27H04H60/97H04L5/023H04L5/143H04L7/0062H04L12/2801H04M7/006H04M7/12H04M9/027H04N7/10H04N7/17309
    • A communication system for coupling telephony or other signals to a broadband network such as a CATV network. The system transmits a multiplex of telephony signals in the forward band of the broadband network, with individual signals directed to an addressed subscriber. Telephony signals returning from subscribers upstream to a headend unit (HIU) are modulated onto the reverse band of the broadband network in a frequency division multiple access (FDMA) arrangement. The upstream modulated telephony signals are received at a telephony network interface at the HIU coupled to the broadband network. A group of reverse band modulated telephony signals are received at a group receiver or channelizer. The group receiver processes all upstream telephony signals within a selected spectral subband in the reverse band to apply a receiver matched filter with a weighted overlap and add circuit, and are then converted to baseband by an FFT circuit. The group receiver provides a serial data stream representing the baseband telephony signals. The baseband telephony signals are processed to derive demodulated telephony signals. The demodulated telephony signals are coupled to the telephony network.
    • 用于将电话或其他信号耦合到诸如CATV网络的宽带网络的通信系统。 该系统在宽带网络的前向频带中发送电话信号的复用,其中各个信号被定向到寻址用户。 从用户上游返回到前端单元(HIU)的电话信号在频分多址(FDMA)布置中被调制到宽带网络的反向频带上。 在耦合到宽带网络的HIU处的电话网络接口处接收上行调制电话信号。 一组反向频带调制电话信号在组接收机或信道发送器处被接收。 组接收机处理反向频带内的所选频谱子带内的所有上行电话信号,以将加权重叠和加法电路应用于接收机匹配滤波器,然后由FFT电路转换为基带。 组接收器提供表示基带电话信号的串行数据流。 处理基带电话信号以导出解调的电话信号。 解调的电话信号耦合到电话网络。
    • 8. 发明申请
    • SECURE ACCESS TELEPHONE EXTENSION SYSTEM AND METHOD
    • 安全接入电话扩展系统和方法
    • WO1994022257A1
    • 1994-09-29
    • PCT/US1994003110
    • 1994-03-21
    • PHONEX CORPORATION
    • PHONEX CORPORATIONBARTHOLOMEW, David, B.IVIE, A., RaySCHURIG, Alma, K.
    • H04M09/00
    • H04B3/542H04B3/54H04B2203/5408H04B2203/5437H04B2203/5441H04M1/72H04M9/027H04M2203/609
    • A method and system is provided for conducting secure power line carrier communications in full duplex over the power lines of a building. The method employs system control logic for (A) multiple extension arbitration logic, (B) privacy from eavesdropping and (C) security from third party central office line capture by means of a digital messaging system in each base (2) and extension (4) unit utilizing a unique and matching security key (preamble) with each message instructing the system to change operating states. Matching of the random security codes may be initiated by the user. By this means unauthorized access to the central office line (especially for long distance calls) and eavesdropping by other users in the same building with similar line carrier telephone extension products is prevented.
    • 提供了一种方法和系统,用于在建筑物的电力线上进行全双工的安全电力线载波通信。 该方法采用系统控制逻辑,用于(A)多扩展仲裁逻辑,(B)隐私来自窃听和(C)来自第三方中心局线路捕获的安全性,通过每个基站(2)和扩展(4)中的数字消息系统 )单元,其利用唯一和匹配的安全密钥(前导码),每个消息指示系统改变操作状态。 随机安全码的匹配可以由用户发起。 通过这种方式,可以防止未经授权的访问中央办公室线路(特别是长途电话)以及与同类建筑物中的其他用户同样的线路电话延伸产品的窃听。