Sensor and method for discriminating coins using fast fourier transform
    1.
    发明申请
    Sensor and method for discriminating coins using fast fourier transform 有权
    用于使用快速傅立叶变换来辨别硬币的传感器和方法

    公开(公告)号:US20050045450A1

    公开(公告)日:2005-03-03

    申请号:US10963314

    申请日:2004-10-12

    摘要: A coin discrimination sensor having an excitation coil and two detector coils arranged to detect eddy currents in a passing coin. The excitation coil is provided a composite waveform formed by adding a low frequency signal (30 KHz) with a high frequency signal (480 KHz). The two detector coils are arranged at different distances from the passing coin, and are calibrated to eliminate the common-mode voltage when no coin is present. As a coin passes by the sensor, eddy currents are induced in the coin which result in phase and amplitude shifts in the low and high frequency components of the detector signal. The low and high frequency components are separated from the detector signal, and their respective phases and amplitudes are ascertained and compared against values stored in a lookup table. These values represent the composition, thickness, and diameter characteristics of known coins, and if the signature of the processed coin does not appear in the lookup table, it can be flagged as an invalid coin.

    摘要翻译: 具有激励线圈的硬币识别传感器和布置成检测通过硬币中的涡流的两个检测器线圈。 励磁线圈提供了通过将低频信号(30KHz)与高频信号(480KHz)相加形成的复合波形。 两个检测器线圈布置在与通过硬币不同的距离处,并且在没有硬币存在时被校准以消除共模电压。 当硬币通过传感器时,在硬币中引起涡流,导致检测器信号的低频和高频分量中的相位和振幅偏移。 低频和高频分量与检测器信号分离,并且确定它们各自的相位和振幅并将其与存储在查找表中的值进行比较。 这些值表示已知硬币的组成,厚度和直径特征,如果处理的硬币的签名没有出现在查找表中,则可以将其标记为无效硬币。

    Coin processing machine and method for discriminating coins of varied composition, thickness, and diameter
    2.
    发明申请
    Coin processing machine and method for discriminating coins of varied composition, thickness, and diameter 有权
    用于辨别不同成分,厚度和直径的硬币的硬币处理机和方法

    公开(公告)号:US20050040007A1

    公开(公告)日:2005-02-24

    申请号:US10954830

    申请日:2004-09-30

    摘要: A coin discrimination sensor having an excitation coil and two detector coils arranged to detect eddy currents in a passing coin. The excitation coil is provided a composite waveform formed by adding a low frequency signal (30 KHz) with a high frequency signal (480 KHz). The two detector coils are arranged at different distances from the passing coin, and are calibrated to eliminate the common-mode voltage when no coin is present. As a coin passes by the sensor, eddy currents are induced in the coin which result in phase and amplitude shifts in the low and high frequency components of the detector signal. The low and high frequency components are separated from the detector signal, and their respective phases and amplitudes are ascertained and compared against values stored in a lookup table. These values represent the composition, thickness, and diameter characteristics of known coins, and if the signature of the processed coin does not appear in the lookup table, it can be flagged as an invalid coin.

    摘要翻译: 具有激励线圈的硬币识别传感器和布置成检测通过硬币中的涡流的两个检测器线圈。 励磁线圈提供了通过将低频信号(30KHz)与高频信号(480KHz)相加形成的复合波形。 两个检测器线圈布置在与通过硬币不同的距离处,并且在没有硬币存在时被校准以消除共模电压。 当硬币通过传感器时,在硬币中引起涡流,导致检测器信号的低频和高频分量中的相位和振幅偏移。 低频和高频分量与检测器信号分离,并且确定它们各自的相位和振幅并将其与存储在查找表中的值进行比较。 这些值表示已知硬币的组成,厚度和直径特征,如果处理的硬币的签名没有出现在查找表中,则可以将其标记为无效硬币。