| 摘要 |
PROBLEM TO BE SOLVED: To reduce an influence on music data by deficient bits of RAM for shock-proofing when compressed music data are written and stored in a RAM for shock-proofing used for a CD player, etc. SOLUTION: This RAM controller 1 is for compressing an input data into auxiliary information such as a compression condition, etc., and main information as a data part compressed under the condition of the auxiliary information, writing and storing them in the RAM, and also extending and outputting the compressed data. In this case, when using the above-mentioned RAM, the controller performs a function test on the memory elements of the addresses where the auxiliary information is to be stored, and stores addresses containing memory elements decides as defective, and controls the RAM so as not to use the addressees containing the memory elements decides as defective at the time of writing the compressed data as a memory area for the auxiliary information.
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