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SECAM-L detector and video broadcast system having the same

  • US 20090073317A1
  • Filed: 09/17/2007
  • Published: 03/19/2009
  • Est. Priority Date: 09/17/2007
  • Status: Active Grant
First Claim
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1. A method for detecting SECAM-L signals, comprising:

  • receiving a video signal and demodulating the video signal into a demodulation signal comprising a plurality of sync pluses and data pulses;

    filtering high-frequency (HF) components of the demodulation signal;

    inverting the 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;

    continuously detecting whether a voltage level of the inversion signal is a lowest level; and

    when the voltage level of the inversion signal is the lowest level, determining whether the lowest level belongs to the inversion sync pulses and then sending out a detection signal;

    wherein when the lowest level belongs to the inversion sync pulses, a voltage level of the detection signal is a high level, the demodulation signal is an inversion SECAM-L demodulation signal.

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