A signal processing system is provided, which includes a first converter for converting first information in to second information, a superimposer for superimposing on the second information control information corresponding to any missing information lost from the first information due to its conversion by the first converter. They include maintaining a sleep set of resource states and an active set of resource states in memory. A middle non-magnetic substrate is then deposited between the first and second magnetic layers and forms the magnetic gap. This permits the die to be characterized prior to assembly, so that the die may then be transferred in an unpackaged form. The light irradiator is arranged so as to irradiate the continuous paper with light obliquely with respect to the detection region of the continuous paper from the width direction side of the continuous paper, which is orthogonal to the transportation direction of the continuous paper.