Agile distortion and noise cancellation across multiple channels and ports in a CATV upconverter/modulator
US8499328B2 · kind B2 · utility
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2References
10Claims
0Family size
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Key dates
| Filing date | Jan 28, 2011 |
| Grant date | Jul 30, 2013 |
| Priority date | — |
| Expiry date | Apr 4, 2032 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N21/6118
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A distortion-cancellation method for analog CATV or QAM transmission over cable is provided wherein a single feedback path from the output of a multiple-channel multiple-port upconverter/modulator is down-converted and used to reduce or cancel undesirable noise components including LO leakage, spurious, and modulated noise. The method allows for real-time monitoring, tuning, or control of the CATV/QAM output and of interfering signals and aging effects as compared to a desired performance metric.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.