| 摘要 |
PROBLEM TO BE SOLVED: To provide an audio signal processor capable of making a service man unnecessary to specially visit a user, and making the user himself possible to easily perform the upgrade of the device. SOLUTION: A user performs mode setting by a control switch 6. When a reproduction mode is set, a DSP 4 processes digital data applied from an external CD player or the like to an input SPDIF signal input terminal 2 according to a program in a memory 5, and returns the data to PCM voice data, and outputs the data to a D/A converter 7. On the other hand, at the time of performing upgrade, the user sets an upgrade mode, and sets a CD for upgrade in the CD player. The DSP 4 overwrites the digital data applied from the CD player to the input SPDIF signal input terminal 2 in the memory 5. Thus, it is possible to perform the upgrade.
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