A document discarding system includes: a document discarding device that discards a document; an image reading device that is used by a client requesting to discard the document; and a document managing device that can communicate with the document discarding device and the image reading device. The system includes specialized techniques for printing the camouflage pattern system unto fabric. A delay device for delays the control signal from the modem and provides the transmission signal processor with the delayed control signal. With this arrangement, the number of terminals that can be used for exchanging data with the digital still camera is increased from four to eight to make it possible to improve the data transfer rate without raising the frequency of the data transfer clock. This use permits the 100% preparation of optically pure amino acids starting from racemic hydantoins in an enzymatic overall process.