An image signal correction device, provided in an electronic still camera, comprises a CPU, an image signal processing circuit, a gamma look-up table and a display in which a recognition information storing unit is provided. The innovation can be used in an \u201casynchronous\u201d manner that enables a user to move or direct a set of activities andor tasks within an activity from one device to another. The blister portion contains a base layer and a blister layer. The selection of symbol rate and number of earners can be optimized for a given channel based on explicit channel measurements, a priori knowledge of the channel, or past experience.