Abstract: A resin composition containing a crystal structure of poly(lactic acid), which is obtained by melt-kneading 30 to 99 mass % of poly(lactic acid) and 70 to 1 mass % of a copolymer having a functional group reactive with the poly(lactic acid); a method of producing the same; and moldings.

Abstract: A synchronization signal detection apparatus and a synchronization signal detection method for improving the reading performance of an input signal after the dissolution of a defect state or the like. Under a predetermined condition after no synchronization signals from an input signal have been detected in predetermined detection periods and the interpolation of synchronization signals has been started, the judgment about whether each of the synchronization signals detected from the input signal continuously is detected at normal timing or not is performed. Then, according to the judgment result, the resynchronization operation of the synchronization signals detected from the input signal and reproducing synchronization signals is performed. Thereby, the state in which the synchronization signals having different timing from originally expected timing are used owing to the interpolation of synchronization signals can be immediately dissolved.