Method and system for impairment shifting
US9160390B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Feb 13, 2012 |
| Grant date | Oct 13, 2015 |
| Priority date | — |
| Expiry date | Jan 20, 2033 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N5/455
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
Methods and systems for impairment shifting may comprise receiving radio frequency (RF) signals in a receiver, downconverting the signals to baseband frequencies, and synchronizing the receiver to received signals. The frequency of a local oscillator (LO) may be adjusted to shift residual impairments to fall between desired baseband signals where they are least visible. The received RF signals may comprise analog, satellite, or cable, television signals. The LO frequency may be adjusted to configure the DC offset impairments to fall between luminance and chrominance harmonics. The LO frequency may be adjusted to configure I/Q imbalanced impairments from residual in-phase and quadrature mismatch of a picture carrier signal to fall about 300 kHz from a sound carrier signal in the analog television signals. The LO frequency may be adjusted to configure the I/Q imbalanced impairments from residual I/Q mismatch of a sound carrier signal to fall between luminance and chrominance harmonics.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.