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312 条记录 (耗时 0.016 秒)

    Data reading systems
    91.
    发明授权
    Data reading systems 失效
    数据读取系统

    公开(公告)号：US3671721A

    公开(公告)日：1972-06-20

    申请号：US3671721D

    申请日：1969-12-12

    申请人： REVENUE SYSTEMS LTD

    发明人： HUNN BERNARD ALBERT ,  HOWELL ELGAN NEVILLE

    IPC分类号： G06K7/08 ,  G06K19/067 ,  G07F7/08 ,  H03B1/00 ,  H03B5/12 ,  G06K19/06 ,  H03B23/00

    CPC分类号： G06K19/0672 ,  G06K7/086 ,  G07F7/086 ,  H03B5/1243 ,  H03B2200/0008 ,  H03B2200/004 ,  H03B2200/0092 ,  H03B2201/0208

    摘要： A data reading system for use particularly in cash- or goodsdispensing machines in which the data to be read is represented by a plurality of passive resonant devices in or on a card and in which, when said data is to be read from said card, said card is placed in the field of a reactive element fed with variable frequency oscillations and associated with counting means in such a way that the count registered by said counting means indicates the resonant frequency of any one or more of said resonant devices located in said field. A card for use in such a system comprises a plurality of passive resonant devices, the resonant frequencies of which represent the data carried by the card.

    摘要翻译： 一种特别用于现金或出货机器的数据读取系统，其中要读取的数据由卡中或其上的多个无源谐振装置表示，并且当所述数据从所述卡片读取时 ，所述卡被放置在馈送有可变频率振荡并且与计数装置相关联的无功元件的场中，使得由所述计数装置登记的计数指示位于所述多个谐振装置中的任何一个或多个谐振装置的谐振频率 领域。

    Intermittent phase control loop for swept frequency pulse generator
    92.
    发明授权
    Intermittent phase control loop for swept frequency pulse generator 失效
    用于开关频率脉冲发生器的间歇相控制环

    公开(公告)号：US3638135A

    公开(公告)日：1972-01-25

    申请号：US3638135D

    申请日：1970-10-08

    申请人： COLLINS RADIO CO

    发明人： STOVER HARRIS A

    IPC分类号： H03B23/00 ,  H03C3/09 ,  H03B3/04

    CPC分类号： H03C3/09 ,  H03B23/00 ,  H03B2200/0092

    摘要： A means for generating pulses with precise time-frequency variation embodies a phase locked loop including a precise reference frequency source and a voltage controlled oscillator by means of which an output frequency may be generated precisely in phase and equal in frequency with respect to the precise reference. Control means including a current source the magnitude of which is a predetermined time varying characteristic determines the variation of output frequency from the initial loop controlled value by supplying current, after loop reference disablement, to a capacitor associated with the loop low-pass filter. The voltage thus supplied to the voltage control oscillator effects a predetermined time variation of output frequency during a prescribed output pulse interval.

    摘要翻译： 用于产生具有精确的时间 - 频率变化的脉冲的装置体现了一种锁相环，其包括精确的参考频率源和压控振荡器，通过该振荡器可以精确地相对于精确参考产生相位和频率相等的输出频率 。 包括电流源的控制装置，其大小是预定的时变特性，通过在环路参考禁用之后将电流提供给与环路低通滤波器相关联的电容器来确定来自初始环路控制值的输出频率的变化。 这样提供给电压控制振荡器的电压在规定的输出脉冲间隔期间产生预定时间的输出频率变化。

    Phase-locked sweep and continuous wave generator
    93.
    发明授权
    Phase-locked sweep and continuous wave generator 失效
    相位锁定和连续波发生器

    公开(公告)号：US3597699A

    公开(公告)日：1971-08-03

    申请号：US3597699D

    申请日：1969-04-02

    申请人： OHMEGA LAB

    发明人： SEIPEL ARNOLD J

    IPC分类号： H03B23/00 ,  H03L7/189 ,  H03B3/04

    CPC分类号： H03B21/00 ,  H03B23/00 ,  H03B2200/0092 ,  H03L7/189

    摘要： As in existing frequency synthesizers, the frequency of a main tunable oscillator is controlled by being phase locked to a voltage obtained by comparing a pulse signal of comparable frequency derived by dividing the oscillator signal frequency by the necessary divisor. Binary-coded decimal switches set the divisor in steps equal to the standard frequency. A central feature of the present invention is a calibrated potentiometer supplied with a voltage that is inversely proportional to the frequency of the main oscillator and is of such a magnitude that moving the arm of the potentiometer from one end to the other will vary the frequency of the main oscillator continuously over a range which is equal to the difference between two successive frequencies determined by the switches, no matter what the frequency of the main oscillator may be. The voltage at the arm of the potentiometer is connected to the standard-frequency generator to modify its frequency a certain percentage, and a sweep signal may also be applied to sweep the standard signal over a limited band and thus sweep the signal of the main oscillator over a controlled band while still retaining a phaselocked condition.