To provide an image signal converter capable of preventing degradation of the resolution in the case that downsizing processing is applied to an image signal and a plurality of images are displayed on the same screen, for example.

The image signal converter divides one screen image of received image signals in the unit of blocks each comprising m×n pixels, collects only pixels at the same positions depending on pixel positions in each of the divided blocks by one screen image to produce m×n sets of reduced images, and sequentially outputs m×n sets of the produced downsized images in a prescribed order so as to carry out image conversion without causing resolution degrading.

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