Tunable filter for tone detection
US8270458B2 · kind B2 · utility
0Cited by
9References
14Claims
0Family size
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Key dates
| Filing date | Jul 24, 2007 |
| Grant date | Sep 18, 2012 |
| Priority date | — |
| Expiry date | Mar 9, 2031 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04Q1/46
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
Apparatus arranged to analyse a signal comprising a series of symbols, the apparatus comprising means for calculating a metric of said signal, filter means for filtering said signal, means for calculating a metric of said filtered signal and means for comparing said metrics, wherein the filtering means is arranged to track a spectral feature of the signal and maintain that feature within the pass band of the filtering means.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.