Coin identification procedure

Details Coin identification procedure Coin identification procedure

1996-09-27

2000-06-27

Williams, Hezron

Measuring and testing

Coin

194317, G07D 500, G07F 302

Patent

active

060792620

ABSTRACT:
The energy of the sound radiation caused by the impact of the coin to be analyzed upon a hard surface is split into different frequency bands, the energy of every such band is obtained and the ratios between them are then worked out, obtaining parameters that are then compared against values representing valid coins. The device includes a bank of filters (6, 7 and 8), integrators (9, 10 and 11) connected to the outlet of the filters and capable of being activated from a microprocessor (17) and an analogue-digital converter to which the output of the various integrators is then connected through a multiplexer.

REFERENCES:
patent: 4096933 (1978-06-01), Massa
patent: 4848556 (1989-07-01), Shah et al.
patent: 5062518 (1991-11-01), Chitty et al.
patent: 5191956 (1993-03-01), Ibarrola
patent: 5226520 (1993-07-01), Parker
patent: 5469952 (1995-11-01), Kershaw et al.

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