Synchronization detector of video signal processor and synchronization selector including the synchronization detector

A synchronization selector of a video signal processor comprising:

• a first synchronization detector that detects a synchronization signal in a video signal processor receiving an input analog video signal including lines having a specific length;
• a second synchronization detector that detects a synchronization signal in a video signal processor receiving an input analog video signal including lines having different lengths;
• a multiplexer that selects one of the synchronization signals respectively output from the first and second synchronization detectors in response to a selection signal and that outputs the selected synchronization signal;
• and
• a controller that generates the selection signal in response to at least one of the input analog video signal, a field length of the input analog video signal and a length of a line included in the field of the input analog video signal, which are detected by the first and second synchronization detectors,
• wherein the first synchronization detector comprises:
• a line buffer that sequentially stores a digital video signal corresponding to the input analog video signal line by line of the input analog video signal;
• a parameter extraction unit that continuously extracts horizontal synchronization parameters from the digital video signal stored line by line and that continuously extracts vertical synchronization parameters from a portion of the digital video signal stored line by line;
• and
• a synchronization detection unit that outputs the field length and the line length using time information related to local minimum values of the horizontal synchronization parameters and time information related to local minimum values of the vertical synchronization parameters.