Patent ID: 8203652
Filing Date: 2012-06-19
Classification: H04N

Abstract:
1. A method for detecting SECAM-L signals, comprising: utilizing a tuner to receive a video signal and demodulate the video signal into a demodulation signal comprising high-frequency (HF) components, a plurality of sync pulses and data pulses; utilizing a SECAM-L detector to filter the high-frequency (HF) components of the demodulation signal; utilizing the SECAM-L detector to invert the filtered demodulation signal into an inversion signal, the inversion signal comprising a plurality of inversion sync pulses and inversion data pulses in correspondence to the demodulation signal; utilizing the SECAM-L detector to continuously detect whether the inversion signal is at a lowest level; and when the inversion signal is at the lowest level, utilizing the SECAM-L detector to determine whether the inversion signal at the lowest level belongs to the inversion sync pulses and then send out a detection signal; wherein when the inversion signal at the lowest level belongs to the inversion sync pulses, the detection signal is at a high level, and the demodulation signal is an inversion SECAM-L demodulation signal.