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1. 发明授权

US4803447A Three terminal remotely controlled SPDT antenna switch 失效
标题翻译：三端子遥控SPDT天线开关
公开(公告)号：US4803447A
公开(公告)日：1989-02-07
申请号：US161502
申请日：1988-02-29
申请人： Charles A. Schultz , Paul D. Marko , Giovanni Jaramillo
发明人： Charles A. Schultz , Paul D. Marko , Giovanni Jaramillo
IPC分类号： H01Q21/00 , H01P1/15 , H01Q3/24 , H04B1/18 , H03H11/36
CPC分类号： H01Q3/24 , H04B1/18
摘要： An antenna switch (302) includes a radio terminal (R) and first and second antenna terminals (A1 and A2). When the second antenna terminal (A2) is unterminated, the radio terminal (R) is coupled to the first antenna terminal (A1). When the second antenna terminal (A2) is connected to a remote antenna system (304), the switch automatically couples the radio terminal (R) to the second antenna terminal (A2). Thus, the switch does not require a separate control terminal (C) and control signal to switch between the first and second antenna terminals. Instead, the switch is controlled by the presence or absence of a DC current at the second antenna terminal (A2). The remote antenna system includes a remote antenna (308) and a low pass filter (310) coupled between the remote antenna and ground. An alternate embodiment is described which includes a DC amplifier (402).
摘要翻译：天线开关（302）包括无线电终端（R）和第一和第二天线终端（A1和A2）。当第二天线端子（A2）未端接时，无线电终端（R）耦合到第一天线端子（A1）。当第二天线终端（A2）连接到远程天线系统（304）时，交换机将无线终端（R）自动地耦合到第二天线终端（A2）。因此，开关不需要单独的控制端子（C）和控制信号在第一和第二天线端子之间切换。相反，开关由第二天线端子（A2）处的DC电流的存在或不存在来控制。远程天线系统包括耦合在远程天线和地之间的远程天线（308）和低通滤波器（310）。描述了包括DC放大器（402）的替代实施例。

2. 发明授权

US4048619A Secure two channel SCA broadcasting system 失效
标题翻译：安全双通道SCA广播系统
公开(公告)号：US4048619A
公开(公告)日：1977-09-13
申请号：US721316
申请日：1976-09-07
申请人： Aubry S. Forman, Jr. , Charles A. Schultz, Jr. , William E. Vice
发明人： Aubry S. Forman, Jr. , Charles A. Schultz, Jr. , William E. Vice
IPC分类号： H04L12/18 , H04B7/26 , H04H1/08 , H04J1/14 , H04Q9/00
CPC分类号： H04L12/1859 , H04L12/189
摘要： A secure information broadcasting system including a central broadcasting station for encoding data in binary form utilizing a keyword and transmitting on one frequency a FM-SCA signal phase shift modulated by the encoded data. The encoded data is also supplied to one or more remote broadcasting stations, typically via telephone lines, where it is transmitted on a second frequency as a FM-SCA signal phase shift modulated by the encoded data. Each remote station transmits a relatively low power signal in a predetermined local area, such as an office building, while the central station transmits a relatively high power signal in a general area including one or more of the local areas. The general area signal is transmitted with a time delay relative to the remote stations. Each of a plurality of portable receiving terminals has an identification number stored therein. When a subscriber desires to display the broadcast information on his terminal, he enters a unique password which is combined with the identification number to generate the keyword. The keyword is utilized to decode the received binary data. The terminal alternately tunes in the two frequencies and will lock on the first frequency signal when the terminal is within the general area but outside the local areas. The terminal will lock on the signal first received in the local area and a reset switch is provided to force the terminal to lock on the second frequency signal when the first frequency signal is present and is first selected in a local area.

3. 发明授权

US4196310A Secure SCA broadcasting system including subscriber actuated portable receiving terminals 失效
标题翻译：安全的SCA广播系统，包括用户激活的便携式接收终端
公开(公告)号：US4196310A
公开(公告)日：1980-04-01
申请号：US848269
申请日：1977-11-03
申请人： Aubry S. Forman , Charles A. Schultz, Jr. , John F. Schultz
发明人： Aubry S. Forman , Charles A. Schultz, Jr. , John F. Schultz
IPC分类号： H04H20/34 , H04H40/18 , H04H60/27 , H04L12/18
CPC分类号： H04H20/34 , H04H40/18 , H04H60/27 , H04L12/1804
摘要： A secure information broadcasting system including a central transmitting station for encoding data in binary form utilizing a keyword and transmitting a FM-SCA signal phase shift modulated by the encoded data. Each of a plurality of portable receiving terminals has an identification number stored therein. When a subscriber desires to display the broadcast information on his terminal, he enters a unique password which is combined with the identification number to generate the keyword. The keyword is utilized to decode the received binary data. The portable terminal includes a receiver for decoding the phase shifted FM-SCA signal into the encoded binary data; a keyboard for entering the password, information and display commands; an alpha-numeric data display; a processor responsive to the inputs from the receiver and the keyboard for performing selected arithmetic and logic operations to generate output data to the data display and a bus connecting the circuits of the portable terminal for parallel signal flow.
摘要翻译：一种安全信息广播系统，包括用于利用关键字对二进制形式的数据进行编码并发送由编码数据调制的FM-SCA信号相移的中央发送站。多个便携式接收终端中的每一个具有存储在其中的识别号。当用户希望在他的终端上显示广播信息时，他输入一个与识别号码相组合的唯一密码，以产生该关键词。该关键字用于解码所接收的二进制数据。便携式终端包括用于将相移的FM-SCA信号解码为编码的二进制数据的接收器; 用于输入密码的键盘，信息和显示命令; 字母数字数据显示; 响应于来自接收器和键盘的输入的处理器，用于执行所选择的算术和逻辑运算以产生到数据显示器的输出数据和连接便携式终端的电路以用于并行信号流的总线。

4. 发明授权

US4112369A Secure SCA broadcasting system including subscriber actuated portable receiving terminals 失效
标题翻译：安全的SCA广播系统，包括用户激活的便携式接收终端
公开(公告)号：US4112369A
公开(公告)日：1978-09-05
申请号：US675504
申请日：1976-04-09
申请人： Aubry S. Forman , Charles A. Schultz , John F. Schultz
发明人： Aubry S. Forman , Charles A. Schultz , John F. Schultz
IPC分类号： H04H20/34 , H04H60/68 , H04J99/00 , H04L12/18 , H04K1/00
CPC分类号： H04L12/1804 , H04H20/34 , H04H60/68
摘要： A secure information broadcasting system including a central transmitting station for encoding data in binary form utilizing a keyword and transmitting a FM-SCA signal phase shift modulated by the encoded data. Each of a plurality of portable receiving terminals has an identification number stored therein. When a subscriber desires to display the broadcast information on his terminal, he enters a unique password which is combined with the identification number to generate the keyword. The keyword is utilized to decode the received binary data. The portable terminal includes a receiver for decoding the phase shifted FM-SCA signal into the encoded binary data; a keyboard for entering the password, information and display commands; an alpha-numeric data display; a processor responsive to the inputs from the receiver and the keyboard for performing selected arithmetic and logic operations to generate output data to the data display and a bus connecting the circuits of the portable terminal for parallel signal flow.
摘要翻译：一种安全信息广播系统，包括用于利用关键字对二进制形式的数据进行编码并发送由编码数据调制的FM-SCA信号相移的中央发送站。多个便携式接收终端中的每一个具有存储在其中的识别号。当用户希望在他的终端上显示广播信息时，他输入一个与识别号码相组合的唯一密码，以产生该关键词。该关键字用于解码所接收的二进制数据。便携式终端包括用于将相移的FM-SCA信号解码为编码的二进制数据的接收器; 用于输入密码的键盘，信息和显示命令; 字母数字数据显示; 响应于来自接收器和键盘的输入的处理器，用于执行所选择的算术和逻辑运算以产生到数据显示器的输出数据和连接便携式终端的电路以用于并行信号流的总线。

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