Patent ID: 8773444

Claim:
A signal processing apparatus comprising: an inputting section configured to input plural video signals; one or more signal processing sections configured to subject the plural video signals inputted to said inputting section to signal processing by adding effects to said plural video signals and mixing the plural video signals to produce at least wipe switching or key switching of said plural video signals and previewing of the image next following said wipe switching; one or more sub-multiscreen split display signal generating sections included as constituent elements of respective ones of said signal processing sections and configured to select P (P: integral number of 2 or more) kinds of video signals from (a) the video signals produced by said signal processing section, and (b) intermediate generation signals generated while said signal processing section subjects the plural video signals to the signal processing, and synthesize the P kinds of video signals thus selected, thereby generating one or more sub-multiscreen split display signals for display as respective sub-screens in a split screen manner, each sub-multiscreen split display generating section operating independently of other sub-multiscreen split display generating sections; and a multiscreen split display signal generating section configured to select Q (Q: integral number of 1 or more) kinds of sub-multiscreen split display signals from the generated one or more sub-multiscreen split display signals for displaying PxQ sub-screens in the split screen manner on a single screen.