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1. 发明授权

US4219821A Automatic direction finding system 失效
标题翻译：自动测向系统
公开(公告)号：US4219821A
公开(公告)日：1980-08-26
申请号：US940254
申请日：1978-09-07
申请人： Harold N. Selim
发明人： Harold N. Selim
IPC分类号： G01S3/14 , G01S3/16 , G01S3/20
CPC分类号： G01S3/143 , G01S3/16
摘要： An automatic direction finding (ADF) system including a direction finding antenna array which connects to a radio receiver to process an audio output signal selectively illuminating a segment of a segmented circular visual directional display indicating the direction from which the received signal arrived. In an FM version, the ADF system electronically switches between antennas in the direction finding antenna array alternately incorporating vector information onto the received carrier in a manner that can be phase detected to produce an audio frequency signal within the normal pre-audio bandpass of the receiver. The audio frequency is then demultiplexed to produce separate vector signals. These separate vector signals are then processed for selectively illuminating a segment of the segmented circular visual directional display. When a sufficiently strong signal is not being received, the ADF system sequentially illuminates each segment of the segmented circular visual directional display in a clockwise direction at a rate which can be readily and visably perceived by an operator. This operation conveys the image of circuit activity, is exciting for an operator to watch, and may have the effect of simulating a radar sweep, although it is in no way related to the searching by the receiver. An additional segment is positioned in the center of the display to indicate the processing of a received radio frequency signal by the ADF system.
摘要翻译：一种自动方向发现（ADF）系统，包括测向天线阵列，其连接到无线电接收器以处理音频输出信号，以选择性地照亮分段的圆形可视方向显示的段，指示接收信号到达的方向。在FM版本中，ADF系统在寻找天线阵列中的天线之间电子地切换，以可相位检测的方式将矢量信息交替地并入到接收的载波上，以在接收机的正常预音频带通内产生音频信号。然后将音频解复用以产生单独的矢量信号。然后处理这些单独的矢量信号以选择性地照亮分段的圆形可视方向显示的片段。当没有接收到足够强的信号时，ADF系统以顺时针方向顺序照射分段的圆形可视方向显示的每个段，其速度可以由操作员容易地且可见地感觉到。该操作传达电路活动的图像，对于操作者来说是令人兴奋的，并且可能具有模拟雷达扫描的效果，尽管它与接收机的搜索没有任何关系。附加段位于显示器的中心，以指示ADF系统对接收到的射频信号的处理。

2. 发明授权

US4641101A Wideband, microwave regenerative divider with varactor tuning 失效
标题翻译：宽带微波再生分压器，具有变容二极管调谐
公开(公告)号：US4641101A
公开(公告)日：1987-02-03
申请号：US664556
申请日：1984-10-25
申请人： Harold N. Selim
发明人： Harold N. Selim
IPC分类号： H03B19/00 , H03B21/02 , H03J3/32 , H03B19/05 , H03L7/00
CPC分类号： H03B21/02 , H03B19/00 , H03J3/32
摘要： A wideband, microwave regenerative divider with varactor tuning in which a double-balanced mixer is incorporated in a feedback loop with a varactor-tuned filter and an RF amplifier in the forward loop, with the RF amplifier output fed directly back to the mixer. A series resonant circuit formed by two serially connected back-to-back varactors interconnected by an inductor is tuned by application of a DC tuning voltage to a center tap of the inductor. In the preferred embodiment two regenerative dividers are connected in series in a YIG oscillator system which includes a programmable tuning circuit connected between the VCO tuning signal input for the YIG oscillator and the tuning voltage inputs of the respective regenerative dividers.
摘要翻译：具有变容二极管调谐的宽带微波再生分压器，其中双平衡混频器并入到具有变容二极管调谐滤波器的反馈环路中，并且正向环路中具有RF放大器，RF放大器输出直接馈送到混频器。由电感器互连的两个串联连接的背靠背变容二极管形成的串联谐振电路通过将DC调谐电压施加到电感器的中心抽头进行调谐。在优选实施例中，两个再生分压器串联连接在YIG振荡器系统中，该YIG振荡器系统包括连接在用于YIG振荡器的VCO调谐信号输入和各个再生分频器的调谐电压输入之间的可编程调谐电路。

3. 发明授权

US4654886A Local oscillator null circuit and method 失效
标题翻译：本机振荡器零电路及方法
公开(公告)号：US4654886A
公开(公告)日：1987-03-31
申请号：US727268
申请日：1985-04-25
申请人： Harold N. Selim
发明人： Harold N. Selim
IPC分类号： H03D7/00 , H04B1/26 , H04B1/10
CPC分类号： H03D7/00 , H03D2200/009
摘要： A local oscillator null circuit and method for use in tuning a wideband, heterodyne receiver relatively close to zero frequency without experiencing excessive feedthrough from a local oscillator to an associated IF stage in the receiver. The local oscillator is connected to circuit means for generating a derivative signal proportional to the local oscillator signal and shifted in phase with respect thereto by a desired amount determined by the phase difference between the local oscillator signal and the signal in the mixer output spectrum which is at the local oscillator frequency. The null circuit combines the derivative signal with the mixer output signal proportionally to produce a null at the local oscillator frequency.
摘要翻译：本地振荡器零电路和方法，用于在接收机中相对接近零频率调谐宽带外差接收器，而不会经历从本地振荡器到相关联的IF级的过量馈通。本地振荡器连接到电路装置，用于产生与本地振荡器信号成比例的导数信号，并相对于其偏移相位所需的量，由本地振荡器信号和混频器输出频谱中的信号之间的相位差确定，在本地振荡器频率。零电路将导数信号与混频器输出信号成比例地组合，以在本地振荡器频率处产生零。

4. 发明授权

US4636747A System and method for wideband, continuous tuning of an oscillator 失效
标题翻译：用于宽带，连续调谐振荡器的系统和方法
公开(公告)号：US4636747A
公开(公告)日：1987-01-13
申请号：US710309
申请日：1985-03-11
申请人： Harold N. Selim
发明人： Harold N. Selim
IPC分类号： H03L7/02
CPC分类号： H03L7/02
摘要： A system and method for continuous tuning of a YIG oscillator over its entire operating range by control of a resolver in a feedback loop around the oscillator. The resolver and a delay line form a phase shift network the output of which is compared in phase with the output of the oscillator, which is also coupled to the input of the resolver, and the phase-difference signal resulting from the phase comparison is coupled to an integrator connected in turn to the tuning signal input of the oscillator. Repetitive operation of the resolver over its operating range enables continuous tuning of the oscillator over its entire operating range.
摘要翻译：通过控制振荡器周围的反馈回路中的分解器，在其整个工作范围内连续调谐YIG振荡器的系统和方法。解算器和延迟线形成一个相移网络，它的输出与振荡器的输出相比较，振荡器的输出也耦合到旋转变压器的输入，并且由相位比较产生的相位差信号被耦合连接到依次连接到振荡器的调谐信号输入的积分器。旋转变压器在其工作范围内的重复操作可以在整个工作范围内连续调谐振荡器。

5. 发明授权

US4356521A Magnetic tape position display system for a sound reproduction system 失效
标题翻译：用于声音再现系统的磁带位置显示系统
公开(公告)号：US4356521A
公开(公告)日：1982-10-26
申请号：US86164
申请日：1979-10-18
申请人： Harold N. Selim
发明人： Harold N. Selim
IPC分类号： G11B27/26 , G11B27/34 , G11B13/04
CPC分类号： G11B27/34 , G11B27/26
摘要： Magnetic recording tape has groups of coded marks which successively identify successive portions of the tape. An optical reader is positioned to read the marks on the tape as the tape travels through the sound reproduction system, and a decoder decodes the marks and identifies, in numerical form, the specific portion of the tape which is in position for sound reproduction. The system has the capability of identifying the specific portion of the tape in position for sound reproduction irrespectively of the speed or direction of travel of the tape within the system, or the position of the tape when operation of the system is initiated.
摘要翻译：磁记录带具有连续地识别带的连续部分的编码标记组。光读取器被定位成当磁带行进通过声音再现系统时读取磁带上的标记，并且解码器对数字形式进行解码，并且以数字形式识别位于声音再现位置的磁带的特定部分。该系统具有识别磁带的特定部分的能力，用于声音再现，而不管磁带在系统内的速度或行进方向如何，或者当系统的操作开始时磁带的位置。

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