Importance

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Abstract

A compact and low-cost multiplexing apparatus for a plurality of high-efficiency encoded image signals is capable of improving an image quality and of shortening a transmission delay time. The multiplexing apparatus for an image signal includes delay compensating circuits provided corresponding to a plurality of image terminals, for storing image encoded signals sent from the respective image terminals; a control circuit for performing a control to form a large frame signal from small frame signals whose number is equal to at the most the number of image signal sources, by detecting frame head codes from input/outputs of the delay compensating circuits, thereby not being duplicated from a plurality of delay compensating circuits, and also adding circuit for adding a frame start code to each of large frames. Even when the frame rates are different between terminals, since all of the image encoded signals are not decoded but multiplexed, deterioration of image qualities and transmission delays can be reduced. Since apparatuses for encoding/decoding images can be omitted, the entire multiplexing apparatus can be made compact.

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First Claim