Video apparatus with video signal detection and respective method for recognizing a video signal
AssigneeThomson Licensing
InventorGraham Byrne
Life of this patent
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Abstract
A video apparatus comprises an input switching matrix, to which a video input is coupled, the video input comprising a terminal for a component video signal and a CVBS terminal and/or a S-VHS terminal, a synchronization signal detector and a color decoder coupled to the input switching matrix, an output switching matrix coupled to the input switching matrix and to the color decoder, and a microcontroller coupled to the input switching matrix and to the synchronization signal detector for controlling the input switching matrix. The detection of the component video signal is made automatic by means of the microcontroller, the synchronization signal detector and the color decoder.
Claims4
Video apparatus comprising
- an input switching matrix, to which at least one video input is coupled, the video input comprising a terminal for a component video signal and a CVBS terminal (Video) or a S-VHS terminal,
- a synchronization signal detector coupled to a luminance output of the input switching matrix,
- a color decoder coupled to the luminance output and to a chrominance output of the input switching matrix,
- an output switching matrix coupled to the input switching matrix and to the color decoder, and
- a microcontroller coupled to the input switching matrix and to the synchronization signal detector for controlling the input switching matrix, characterized in that the detection of the component video signal is made automatic by means of the microcontroller, which, after selecting a Y video input, sets the input switching matrix to pass a signal from the terminal for the component video signal of said video input to the synchronization signal detector, and, in case this terminal provides a valid luminance signal, then a component video signal is recognized, which is switched through then by the output switching matrix, and, in case no valid luminance signal is available at the component video terminal, then the microcontroller switches the input switching matrix to the CVBS terminal or a S-VHS terminal of said video input, respectively, for checking for a valid synchronization signal by means of the synchronization signal detector.
Method for automatic detection of a component video signal within a video apparatus having a video input with a terminal for a component video signal, an input switching matrix, a microcontroller, and a synchronization signal detector, the method comprising the subsequent steps of:
- a) after selecting the video input, the microcontroller sets the input switching matrix to pass a Y signal from the terminal for the component video signal to the synchronization signal detector,
- b) the microcontroller waits for a specified period of time for a signal to settle,
- c) the microcontroller accesses the synchronization signal detector to get a feedback on the validity and stability of a luminance signal,
- d) if a valid luminance signal is present, then the component video input is valid and the respective component video signal is switched through then by an output switching matrix,
- e) in case no valid luminance signal is available at the component video terminal, then the microcontroller switches the input switching matrix to a CVBS terminal or a S-VHS terminal of the video input, to check for a valid synchronization signal by means of the synchronization signal detector.
Dependencies are inferred from the claim text.