Method and apparatus for detecting an EAS (electronic article surveillance) marker using wavelet transform signal processing
US6310963A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Sep 30, 1994 |
| Grant date | Oct 30, 2001 |
| Priority date | — |
| Expiry date | Sep 30, 2014 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06F2218/08
- WIPO fieldControl
- WIPO sectorInstruments
Abstract
Wavelet transform processing is performed on an input signal received at a receiver circuit of an electronic article surveillance (EAS) system. The input signal includes a target signal generated by an EAS marker and also includes correlated high amplitude interference signals. The wavelet transform processing is performed so as to generate from the input signal plural wavelet transform signals having mutually different phases. The wavelet transform is substantially phase invariant with respect to the interference signals and lacks phase invariance with respect to the target signal. Uncorrelated components of the plural phase-diverse wavelet transform signals are identified to detect the target signal.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.