Resonant circuit detection measurement and deactivation system employing a numerically controlled oscillator
US6359562B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Mar 16, 2001 |
| Grant date | Mar 19, 2002 |
| Priority date | — |
| Expiry date | Mar 16, 2021 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG08B13/242
- WIPO fieldControl
- WIPO sectorInstruments
Abstract
An apparatus for deactivating a resonant circuit without physically contacting the resonant circuit. The EAS system includes a numerically controlled oscillator for generating an alternating electric signal, the frequency of the alternating electric signal varying in accordance with a numerical frequency control signal; a clock having a substantially fixed frequency connected to the numerically controlled oscillator; and a transmitting antenna connected to the numerically controlled oscillator for establishing an electromagnetic field within a deactivation zone. The frequency of the alternating electric signal is restricted to being an integer multiple of an integer sub-multiple of the clock frequency.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.