| 摘要 |
PROBLEM TO BE SOLVED: To use the copied CD musical data only for a CD owner by providing a means encoding the CD linear PCM data with an optical storage and decoding the data with a sound reproducing device, and also providing a setting means of an encoding/decoding key and a storage means of a key in respective devices. SOLUTION: The linear PCM data in a musical CD 10 are read out by a CD-ROM drive 11, and are compressed/encoded to be transferred onto a main memory of a personal computer main body. The encoded CD data are copied onto a flash memory card 12 in a regular file form by a card drive loaded on the personal computer. The card 12 is used by being loaded on a portable type card type player 13. In the card type player 13, the data are read out from the card 12, and are decoded, and expanded further to be returned to the linear PCM data. The linear PCM data are made an audio analog signal by a digital analog converter to be outputted as music by an earphone, etc. |
