Multi-input video signal processing method and apparatus

A video signal processing method employed in a video signal processing apparatus that includes a plurality of signal processing parts, each for executing signal processing, for processing two or more digitalized video signals in parallel, comprising the steps of:

• selecting one or more video signals from said two or more digitalized video signals;
• and
• obtaining an object video signal by selecting, from said plurality of signal processing parts, signal processing parts used for signal processing of said selected video signals in accordance with a mode of said object video signal and performing said signal processing in said selected signal processing parts in an order in accordance with said mode of said object video signal,
• wherein said video signal processing apparatus includes, as said plurality of signal processing parts, a signal processing part that performs signal processing without using said clock.

A video signal processing apparatus that receives, as input video signals, a plurality of digitalized video signals and outputs an output video signal generated on the basis of video signal selected from said input video signals, comprising:

• an input signal selection unit for selecting, from said plurality of input video signals, one video signal as a main system video signal and another video signal as a sub system video signal and outputting said selected video signals;
• a main system signal processor for receiving said main system video signal, performing video signal processing by using a clock having a frequency higher than a clock frequency of said main system video signal and outputting a resultant video signal as an output thereof in synchronization with a synchronization signal of said output video signal;
• a sub system signal processor for receiving said sub system video signal, performing video signal processing by using a clock having a frequency higher than a clock frequency of said sub system video signal and outputting a resultant video signal as an output thereof in synchronization with said synchronization signal of said output video signal;
• a timing controller for receiving said synchronization signal of said output video signal and outputting an output select signal in synchronization with said synchronization signal of said output video signal;
• and
• a screen synthesis unit for receiving the outputs of said main system signal processor and said sub system signal processor and outputting said output video signal, in which screens are synthesized, through selection in accordance with said output select signal.

A video signal processing apparatus that receives, as input video signals, a plurality of digitalized video signals and outputs an output video signal generated on the basis of video signal selected from said input video signals, comprising:

• an input signal selection unit for selecting, from said plurality of input video signals, one video signal as a main system video signal and another video signal as a sub system video signal and outputting said selected video signals;
• a main system signal processor for receiving said main system video signal, performing video signal processing by using a clock having a frequency higher than a clock frequency of said main system video signal and outputting a resultant signal as an output thereof;
• a main system quality corrector for performing picture quality correction on the output of said main system signal processor and outputting a resultant video signal as an output thereof;
• a sub system signal processor for receiving said sub system video signal, performing video signal processing and outputting a resultant signal as an output thereof;
• a sub system quality corrector for performing picture quality correction on the output of said sub system signal processor and outputting a resultant video signal as an output thereof;
• a timing controller for receiving a synchronization signal of said output video signal and outputting an output select signal in synchronization with said synchronization signal of said output video signal;
• and
• a screen synthesis unit for receiving the outputs of said main system quality corrector and said sub system quality corrector and outputting said output video signal, in which screens are synthesized, through selection in accordance with said output select signal.