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1. 发明授权

US3949401A Frequency identification circuit for broadcast traffic information reception systems 失效
标题翻译：用于广播交通信息接收系统的频率识别电路
公开(公告)号：US3949401A
公开(公告)日：1976-04-06
申请号：US551689
申请日：1975-02-21
申请人： Wilhelm Hegeler , Lambert Maschmeyer , Hans Rasehorn
发明人： Wilhelm Hegeler , Lambert Maschmeyer , Hans Rasehorn
IPC分类号： G08G1/09 , H04B7/00
CPC分类号： G08G1/094
摘要： Frequencies which respectively identify a particular transmitter, and a particular program content, and which are in a very low frequency range (from between 20 to 125 kHz can be recognized, and ditigal output control signals derived representative of whether one, or both, or none of these frequencies are present by use of a frequency selection input circuit, controlled by a change-over switch to initially select recognition of the transmitter identification which, if positive, is applied through a storage circuit having a storage time substantially longer than the switch-over rate, to provide an output signal if the selected transmitter is recognized, and hold that output signal during switch-over of the program content identification signal which, if present, will be fed back through a logic circuit to hold the output of the transmitter identification circuit as identified, and if not present, permit continued switch-over of the frequency identification circuit to continue to store transmitter identification signals, if present, but permit these signals to disappear, after the storage time, if the transmitter identification signals also cease. The time delay and storage circuit preferably include operational amplifiers, and the frequency identification circuit includes a phase-locked loop.
摘要翻译：可以识别分别识别特定发射机和特定节目内容并且处于非常低的频率范围（从20到125kHz之间的频率）的频率以及代表一个或两个或者两者的二进制输出控制信号这些频率通过使用频率选择输入电路存在，由转换开关控制，以最初选择识别发射机标识，发射机标识如果通过具有比开关转换器的存储时间大得多的存储电路被施加，如果所选择的发射机被识别，则提供输出信号，并且在节目内容识别信号的切换期间保持该输出信号，如果存在的话，将通过逻辑电路反馈以保持发射机的输出识别电路，如果不存在，允许频率识别电路继续切换以继续存储t 发射机识别信号，如果存在，但允许这些信号消失，在存储时间之后，如果发射机识别信号也停止。时间延迟和存储电路优选地包括运算放大器，并且频率识别电路包括锁相环。

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