Digital spread spectrum technique for electromagnetic emission reduction
US9858753B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jan 13, 2017 |
| Grant date | Jan 2, 2018 |
| Priority date | — |
| Expiry date | Jan 13, 2037 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG07F17/3223
- WIPO fieldControl
- WIPO sectorInstruments
Abstract
Techniques for reducing electromagnetic (EM) emission in a wager-based gaming machine. A gaming machine includes one or more processors configured to generate a bus clock signal having a fundamental frequency and fundamental spectral components at harmonics of the fundamental frequency. The fundamental spectral components each have a fundamental amplitude. A signal processor is configured to generate a spread spectrum clock signal having a nominal frequency substantially equivalent to the fundamental frequency of the bus clock signal as well as nominal spectral components at harmonics of the nominal frequency. However, the nominal spectral components each have a nominal amplitude less than the fundamental amplitude of a fundamental spectral component at the same harmonic. A bus connects the signal processor with one or more elements and carries the spread spectrum clock signal to the one or more elements, thereby reducing EM emissions from the bus.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.