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公开(公告)号：US5134277A
公开(公告)日：1992-07-28
申请号：US577796
申请日：1990-09-05
CPC分类号： G07C9/00111 , A01K11/00 , A01K29/005 , G06K7/0008
摘要： A remote data transfer system, particularly an identification system for identifying objects such as livestock, pets and containers. An interrogator generates a directional light beam which the operator can direct at a selected animal or package up to 30-14 200 meters away; and a tag transponder carried by the object is activated only on receipt of the light beam, and transmits a coded RF signal. The signal is received by the interrogator which displays the identity of the animal derived from the coded RF signal. In its "receive" mode, the tag transponder requires minimal power, thereby prolonging battery life. A short rise time light pulse (or a pulse sequence) is identified and used to switch power to the transponder. After transmission of the coded RF signal, the transponder returns to a low power draw stand-by state. The tag is also able to transmit real time information, with or without the tag identity data. Furthermore, the tag is able to accept data from a remote source and substantially simultaneously transmit data.
摘要翻译： 远程数据传输系统，特别是用于识别诸如家畜，宠物和容器之类的物体的识别系统。 询问器产生定向光束，操作者可以在距离30-1400米处的所选择的动物或包装上引导; 并且由对象携带的标签应答器仅在接收到光束时被激活，并且发送编码的RF信号。 信号由询问器接收，该询问器显示从编码的RF信号导出的动物的身份。 在“接收”模式下，标签转发器需要最小功率，从而延长电池寿命。 识别短的上升时间光脉冲（或脉冲序列），并将其用于切换到应答器的电源。 在发送编码的RF信号之后，应答器返回到低功率待机状态。 该标签还能够发送具有或不具有标签标识数据的实时信息。 此外，标签能够接收来自远程源的数据并且基本上同时发送数据。
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公开(公告)号：US5134720A
公开(公告)日：1992-07-28
申请号：US646528
申请日：1991-01-25
IPC分类号： H03J1/00
CPC分类号： H03J1/0091
摘要： A signal locating apparatus for locating within a frequency band an input signal of a first frequency, the signal locating apparatus including a signal receiver for receiving the input signal. The signal receiver is characterized by having a relatively narrow bandwidth response of variable center frequency, the signal receiver being capable of generating a detected signal when the center frequency is substantially equal to the first frequency, the signal locating apparatus further including search device for varying the center frequency at a relatively high rate so as to cause the signal receiver to search for the presence of the input signal within a frequency band, the search device being operable in response to generation of the detected signal to stop the search for the presence of the input signal. The signal receiver includes an oscillator of variable frequency which determines the center frequency, a mixer receiving the input signal and operative to generate an intermediate frequency signal and a demodulator connected to receive the intermediate frequency signal and operative to generate the detected signal upon receipt of the intermediate frequency signal. The search device includes an integrator connected so as to receive the output signal of the demodulator so that the occurrence of the detected signal at the demodulator output causes an abrupt change in the integrator output.
摘要翻译： 一种信号定位装置，用于在频带内定位第一频率的输入信号，信号定位装置包括用于接收输入信号的信号接收器。 信号接收机的特征在于具有可变中心频率的相对窄的带宽响应，当中心频率基本上等于第一频率时，信号接收机能够产生检测信号，信号定位装置还包括用于改变 中心频率以相对较高的速率进行，以使得信号接收机在频带内搜索输入信号的存在，该搜索装置可响应于检测到的信号的产生而停止搜索， 输入信号。 该信号接收机包括一个确定中心频率的可变频率振荡器，一个混合器接收输入信号并且可操作地产生一个中频信号，一个解调器被连接成接收中频信号，并在接收到中频信号时产生检测信号 中频信号。 搜索装置包括一个积分器，连接成接收解调器的输出信号，使得在解调器输出处的检测信号的出现导致积分器输出的突然变化。
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公开(公告)号：US4945225A
公开(公告)日：1990-07-31
申请号：US247000
申请日：1988-09-16
CPC分类号： G06K7/10851 , G01S7/487 , G07C9/00111
摘要： A discriminating apparatus for discriminating a radiant information signal from a background signal, the discriminating apparatus including a radiation sensing means sensitive to an incident signal comprising both an information signal and a background signal and operative to generate an output sensing signal of a level related to the level of the incident signal, and detector means responsive to the sensing signal to detect an information signal component of the sensing signal from a background signal level component of the sensing signal. The discriminating apparatus is characterized in that the detector means comprises a circuit section, particularly a semiconductor element, which is maintained in an operating region where a superimposed information component of the sensing signal resulting from reception by the radiation sensing means of the information signal produces a substantial magnitude detector signal regardless of the level of the background component of the sensing signal resulting from incident background radiation so as to thereby maintain the discrimination of the information signal component of the sensing signal.
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