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    • 3. 发明授权
    • Electronic traffic control and warning system
    • 电子交通控制和预警系统
    • US4241326A
    • 1980-12-23
    • US1728
    • 1979-01-08
    • William Odom
    • William Odom
    • G08G1/0965G08G1/16H04B7/00
    • G08G1/0965G08G1/161
    • An electronic system provides traffic control and warning functions by radio transmission of signals to civilian vehicles from authorized mobile units, such as police vehicles and portable units at dangerous locations, such as the scene of an accident or road obstruction, etc., utilizing transmission within a police communications band. Transmitting circuitry carried within the mobile unit includes means for modulating the frequency modulation carrier signal radiated by an antenna with either a voice message or by preselected pulse messages. Receiving circuitry is carried within each of a plurality of civilian vehicles separate from the mobile unit, the antenna of such vehicles picking up the modulated carrier signal when the vehicle is within at least the general vicinity of the transmitting mobile unit. The receiving circuitry provides automatically selective response to the modulated carrier signal regardless of its frequency within the band and includes a demodulator and a pulse separator circuit responsive to a demodulated pulse message. A sequential switching arrangement and signalling devices interconnected with it provide visual signalling in different formats to the operator of the receiving vehicle. A further circuit is responsive also to operation of the sequential switching equipment to interconnect a transducer with the amplified output of the demodulator in response to the detection of a predetermined pulse message of a predetermined second type. Such arrangement allows the operator of the mobile unit, e.g., a policeman, to signal drivers of receiving vehicles by display of visual signals within such vehicles and also to speak directly to such drivers.
    • 电子系统通过无线电传输来自授权的移动单位(例如警车和便携式单位)在诸如事故现场或道路障碍等危险场所的民用车辆提供交通管制和警告功能,利用在 一个警察通信乐队。 携带在移动单元内的发送电路包括用于通过语音消息或预先选择的脉冲消息来调制由天线辐射的频率调制载波信号的装置。 在与移动单元分开的多个民用车辆的每一个内承载接收电路,当车辆至少在发送移动单元的附近时,这种车辆的天线拾取调制载波信号。 无论接收电路在频带内的频率如何,接收电路都能自动选择响应调制的载波信号,并包括响应解调脉冲信号的解调器和脉冲分离器电路。 与其互连的顺序切换装置和信令装置为接收车辆的操作者提供不同格式的视觉信号。 响应于检测到预定第二类型的预定脉冲消息,另一电路还响应顺序交换设备的操作以将换能器与解调器的放大输出互连。 这样的布置允许移动单元的操作者,例如警察,通过在这样的车辆内显示视觉信号,来向接收车辆的驾驶员发出信号,并且直接与这种驾驶员说话。