Video standard detector and operation method thereof
AssigneeHimax Media Solutions, Inc.
InventorChao-Wei Huang
Life of this patent
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Abstract
A video standard detector and operation method thereof are provided. The video standard detector includes a low pass filter (LPF) unit and a standard detector unit. The LPF filters a baseband signal. The feature detector detects vertical synchronization information of the baseband signal and horizontal synchronization information of the baseband signal using the output of the LPF, and determines the video standard corresponding to the baseband signal according to the vertical synchronization information and the horizontal synchronization information.
Claims17
A video standard detector for determining a video standard corresponding to a baseband signal, comprising:
- a low pass filter (LPF) filtering the baseband signal;
- and
- a feature detector, coupled to the LPF, detecting vertical synchronization information of the baseband signal and horizontal synchronization information of the baseband signal using the output of the LPF, and determining the video standard corresponding to the baseband signal according to the vertical synchronization information and the horizontal synchronization information.
An intermediate frequency (IF) demodulator, comprising:
- an analog-to-digital converter (ADC) converting an IF signal to a digital signal;
- an IF-to-baseband unit, coupled to the ADC, shifting a the digital signal to generate a baseband signal;
- a low pass filter (LPF) unit, coupled to the IF-to-baseband unit, filtering the baseband signal;
- a feature detector, coupled to the LPF, detecting vertical synchronization information of the baseband signal and horizontal synchronization information of the baseband signal using the output of the LPF, and determining the video standard corresponding to the baseband signal according to the vertical synchronization information and the horizontal synchronization information;
- and
- a baseband processor, coupled to the IF-to-baseband unit and the feature detector, processing the baseband signal according to the video standard in order to produce a composite video broadcast signal and a sound signal.
A video standard detection method for determining a video standard corresponding to a baseband signal, comprising:
- filtering the baseband signal to output a filtered result;
- detecting vertical synchronization information by using the filtered result;
- detecting horizontal synchronization information by using the filtered result;
- and
- determining the video standard corresponding to the baseband signal according to the vertical synchronization information and the horizontal synchronization information.
Dependencies are inferred from the claim text.