SECAM-L detector and video broadcast system having the same
First Claim
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.
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Accused Products
Abstract
A method for detecting SECAM-L signals is disclosed. First, a SECAM-L signal is received and demodulated into a demodulation signal. Then high frequency components of the demodulation signal are filtered out and a low frequency signal, including many sync pulses and many data pulses, is obtained. Next, the low frequency signal is inversion into an inversion signal, having many inversion sync pulses and many inversion data pulses. Afterwards a voltage level of the inversion signal is detected continuously whether it is a lowest level. After that, the lowest level is determined whether belonging to the inversion sync pulses when the voltage level of the inversion signal is the lowest level, and a detection signal is outputted. When the lowest level belongs to the inversion sync pulses, a voltage level of the detection signal is high, and the demodulation signal is an inversion SECAM-L demodulation signal.
10 Citations
19 Claims
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1. A method for detecting SECAM-L signals, comprising:
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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. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A method for detecting SECAM-L signals, comprising:
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utilizing a tuner to demodulate a video signal into a demodulation signal; and utilizing a SECAM-L detector to detect whether an inversion signal of the demodulation signal is at a lowest level to determine whether the demodulation signal is an inversion SECAM-L demodulation signal. - View Dependent Claims (10, 11)
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12. A video broadcast system, comprising:
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a tuner, for demodulating a video signal into a demodulation signal comprising high-frequency (HF) components, a plurality of sync pulses and data pulses; and a SECAM-L detector, for detecting whether an inversion signal of the demodulation signal is at a lowest level to determine whether the demodulation signal is an inversion SECAM-L demodulation signal. - View Dependent Claims (13, 14, 15, 16, 17, 18, 19)
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Specification