The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jan. 31, 2012
Filed:
Aug. 15, 2007
Hyo-ju Kim, Yongin-si, KR;
Seong-won Lee, Seongnam-si, KR;
Do-gyun Kim, Seoul, KR;
Yun-sung Wang, Seoul, KR;
Ji-hoon Jang, Younin-si, KR;
Hyo-Ju Kim, Yongin-si, KR;
Seong-Won Lee, Seongnam-si, KR;
Do-Gyun Kim, Seoul, KR;
Yun-Sung Wang, Seoul, KR;
Ji-Hoon Jang, Younin-si, KR;
Nextchip Co., Ltd., Seoul, KR;
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.