A thermal barrier coating for a component intended for use in a hostile environment, such as the superalloy turbine, combustor and augmentor components of a gas turbine engine. The switch circuit outputs a first image signal generated by the main path or a second image signal generated by the sub path by switching therebetween, and the first judging circuit outputs a first motion signal in accordance with an output of the motion region detection circuit. If the BER is less than a particular threshold value, the sector is taken as OK. The microcontroller can cause the measurement of a number of operational parameters of the memory module.