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    Input filtering apparatus for loudspeakers
    1.
    发明授权
    Input filtering apparatus for loudspeakers 失效
    输入滤波器

    公开(公告)号：US4113983A

    公开(公告)日：1978-09-12

    申请号：US678461

    申请日：1976-04-20

    申请人： Paul Franklin Steel

    发明人： Paul Franklin Steel

    IPC分类号： H03G5/22 ,  H03H11/04 ,  H04R3/00 ,  H04R3/04 ,  H04B1/64

    CPC分类号： H03G5/22 ,  H04R3/002 ,  H04R3/04

    摘要： Improved input filtering apparatus for loudspeaker systems, and loudspeaker systems including such apparatus. The bass roll-off point of input filtering apparatus for loudspeakers is automatically adjusted to an optimum in accordance with the amplitude and spectral content of the audio signal being received at the time, thereby attenuating components in the signal liable to cause "bottoming" of the loudspeaker. The input filter apparatus comprises a first high-pass filter having a breakpoint frequency at or near the lower threshold of the audio frequency range, a second variable bandwidth, high-pass filter connected to receive the first high-pass filter output, a feedback circuit responsive to the second filter output to provide a feedback signal as a linear function thereof with a gain which is substantially inversely proportional to the square of the frequency, and circuit means including threshold means connected with the second filter and responsive to the said feedback signal to relatively rapidly increase the breakpoint frequency of the second filter in response to values of the feedback signal which exceed a threshold and to relatively showly reduce that breakpoint frequency in response to values of the feedback signal which do not exceed the said threshold. Bass equalization circuit means having a frequency response at the low end of the audio spectrum which is substantiallythe inverse of the frequency response of said loudspeaker means are provided between the output of the second filter and the loudspeaker drive circuit.

    Apparatus for validating items of value, and method of calibrating such apparatus
    3.
    发明授权
    Apparatus for validating items of value, and method of calibrating such apparatus 失效
    用于验证物品价值的装置以及校准这种装置的方法

    公开(公告)号：US5971128A

    公开(公告)日：1999-10-26

    申请号：US793762

    申请日：1997-03-05

    申请人： Gregory John Billington ,  Paul Franklin Steel

    发明人： Gregory John Billington ,  Paul Franklin Steel

    IPC分类号： G07D5/00 ,  G07D7/00 ,  G07D5/08

    CPC分类号： G07D5/00 ,  G07D7/00 ,  G07D2205/0012

    摘要： A coin or banknote validator is calibrated to accept items of value by taking successive measurements of items and using them to update acceptability data which defines at least one acceptability criterion for testing. Each measurement is first checked against a suitability criterion, and is only used for updating the acceptability data if the suitability criterion is met. In this way, the acceptability data can be derived without storing all the individual measurements, while still rejecting those measurements which are statistically unsound. The suitability criteria is such that if a measurement differs from the current acceptability data by more than a predetermined amount, the criterion is not met. To avoid problems resulting from the first measurement being unsound, this first measurement is discarded if it does not lie within a predetermined range of the second measurement.

    摘要翻译： PCT No.PCT / GB95 / 02125 Sec。 371日期1997年3月5日 102（e）1997年3月5日PCT PCT 1995年8月9日PCT公布。 出版物WO96 / 07992 日期1996年3月14日硬币或钞票验证器通过连续测量项目进行校准，以接受物品，并使用它们来更新可接受性数据，该数据定义了至少一个可接受标准进行测试。 首先根据适用性标准对每个测量进行检查，如果满足适用性标准，则仅用于更新可接受性数据。 以这种方式，可以导出可接受性数据，而不存储所有单独的测量，同时仍然拒绝那些在统计学上不健全的测量。 适用标准是，如果测量结果与当前的可接受性数据不同，则不符合标准。 为了避免第一次测量不稳定的问题，如果第一测量不在第二测量的预定范围内，则该第一测量被丢弃。

    Money validation
    4.
    发明授权
    Money validation 失效
    货币验证

    公开(公告)号：US5715926A

    公开(公告)日：1998-02-10

    申请号：US553381

    申请日：1996-02-12

    申请人： David Michael Furneaux ,  Stephen John Dillon ,  Paul Franklin Steel

    发明人： David Michael Furneaux ,  Stephen John Dillon ,  Paul Franklin Steel

    IPC分类号： G01D5/20 ,  G01D5/247 ,  G07D5/00 ,  G07D5/08

    CPC分类号： G07D5/08 ,  G01D5/2013 ,  G01D5/202 ,  G01D5/247

    摘要： Apparatus for validating items of value is described. The apparatus includes a measurement circuit including an inductor, the complex impedance of which varies in accordance with the interaction between a test item of value and a magnetic field within which the inductor is located. Circuitry is provided for extracting first and second periodic signals from the measurement circuit, and a circuit is provided for timing the interval between corresponding portions of the first and second periodic signals. A processing element then determines the value of a parameter related to at least one of the real and imaginary parts of said complex impedance, as a measure of the validity of said test item, from the outputs of the timing circuit.

    摘要翻译： PCT No.PCT / GB95 / 00511 Sec。 371日期：1996年2月12日 102（e）日期1996年2月12日PCT 1995年3月9日PCT公布。 公开号WO95 / 24697 日期1995年9月14日描述了验证价值项目的设备。 该装置包括测量电路，其包括电感器，其复阻抗根据测试项目与电感器所位于的磁场之间的相互作用而变化。 提供了用于从测量电路提取第一和第二周期信号的电路，并且提供了用于对第一和第二周期信号的相应部分之间的间隔进行定时的电路。 然后，处理元件根据定时电路的输出，确定与所述复阻抗的实部和虚部中的至少一个有关的参数的值作为所述测试项目的有效性的量度。

    Method and apparatus for validating currency
    6.
    发明授权
    Method and apparatus for validating currency 失效
    验证货币的方法和装置

    公开(公告)号：US06705448B1

    公开(公告)日：2004-03-16

    申请号：US09762612

    申请日：2001-03-30

    申请人： Paul Franklin Steel

    发明人： Paul Franklin Steel

    IPC分类号： G07D500

    CPC分类号： G07D5/00 ,  G07D7/00

    摘要： Coins may be validated and denominated by comparing varying signals from coin sensors and checking whether a predetermined relationship between them is maintained, for example, as the coin moves past die sensors. In some implementations, each varying signal may represent the varying effect on a sensor as the coin moves relate to the sensor.

    摘要翻译： 可以通过比较来自硬币传感器的变化信号并检查它们之间是否保持预定的关系，例如当硬币移动通过模具传感器时，可以验证和指定硬币。 在一些实施方案中，当硬币移动涉及传感器时，每个变化的信号可以表示对传感器的变化的影响。