Patent ID: 8330874

Claim:
A video signal conversion device comprising: a selection section that selects a selected video signal out of two or more video signals input in accordance with a selecting instruction supplied from a predetermined operation section; a selected video signal distinguishing section that recognizes the signal type of the selected video signal; a conversion processing section that converts, in accordance with the result of recognizing the signal type of the selected video signal, the selected video signal into a display signal format suitable for a predetermined display section and then supplies the converted signal to the display section; a target video signal distinguishing section that controls the selection section to select a target video signal from a group of unselected video signals not including the selected video signal, and then recognizes the signal type of the target video signal; an information generation section that generates a piece of video information from the result of recognizing the signal type of the target video signal and then stores the piece of video information in a predetermined storage section; and a switch control section that reads out, when accepting from the operation section a switching instruction that instructs to select another video signal as a selected video signal, a piece of video information corresponding to the another video signal from the storage section and then controls the conversion processing section to convert the another video signal into the display signal format in accordance with the piece of video information, in which the signal type of a first selected video signal is recognized by use of a first procedure and the signal type of a second selected video signal which is subsequent to the first selected video signal is recognized by use of a second procedure, in which the first procedure is a video distinguishing process which includes performing a checking operation to determine a number of parameters associated with the respective video signal, and in which the second procedure utilizes the respective piece of video information from the storage section and does not include performing the video distinguishing process of the first procedure, in which the target video signal distinguishing section controls the selection section to select another unselected video signal as a target video signal, and in which the operation section is operable to supply a frequency signal so as to cause a frequency at which each video signal from the group of unselected video signals is processed by the target video signal distinguishing section to be varied in accordance with an input from a user such that the frequency of processing for a first video signal from the group of unselected video signals is different than that for a second video signal from the group of unselected video signals.