Frequency demodulator for recovering SECAM chrominance signal and method thereof
US8107013B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Aug 15, 2007 |
| Grant date | Jan 31, 2012 |
| Priority date | — |
| Expiry date | Nov 30, 2030 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N11/186
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
An apparatus for recovering a chrominance signal from a sequential color with memory (SECAM) composite video baseband signal (CVBS), and more particularly, to a frequency demodulator and method of recovering a SECAM chrominance signal which can utilize both a real number portion and an imaginary number portion, and generate a frequency-demodulated chrominance signal using an arctangent approximation, and thereby can simplify a circuit configuration of a frequency demodulator to perform a fixed-point calculation is provided. A frequency demodulator for recovering a chrominance signal, the frequency demodulator comprises a phase differentiator generating a phase difference component between neighboring samples from an input signal and a phase estimator calculating a phase difference between the neighboring samples by using an arctangent approximation, based on the generated phase difference component, wherein the frequency demodulator generates a frequency-demodulated chrominance signal and the phase difference corresponds to the chrominance signal.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.