A signal processing device and signal processing method, and program and recording medium, whereby images and the like closer approximating real world signals can be obtained. The apparatus includes a plurality of chain links. When an artifact is detected, previously received known-good signal segments may be buffered and replace the signal segment or segments containing artifact. If not, neglect this contact point; if yes, obtain a third sampling value of the contact point at a third time point. A suitable anti-corrosive chemical may be added to the composition to prevent rust inside the tire. The switching member has a plurality of switching positions for selectively guiding each of lights of at least two different wavelengths into the first direction or second direction.