| 摘要 |
<p>A coin acceptor includes sensor coil units (C1, C2, C3, C4) small enough to sense respective different regions of the face of a coin (8) as it moves past them, so as to produce time varying sensor outputs (x1(a), x2(a), x2(f), x3(a), x4(a)) as a function of the different regions. The sensor outputs are sampled repetitively. A microcontroller (11) monitors the sample values so as to determine when the value of at least one of the sensor outputs adopts a predetermined criterion, e.g. reaching a peak value and in response thereto, compares the value of the sensor output that includes the peak value with corresponding values stored in an EEPROM (12) to determine the acceptability of the coin.</p> |
