| 摘要 |
PROBLEM TO BE SOLVED: To provide a wired and wireless MODEM. SOLUTION: In this modem, a frequency conversion circuit 3 that executes a synchronization processing between a digital signal and an analog signal, a signal distribution circuit 4 that receives a signal from an A/D and D/A signal conversion circuit 2 and a correction circuit 5 are arranged on the same board, a subminiature arithmetic processing circuit 6 (incorporated with an MPU, a ROM, a RAM and an I/F) that applies processing control to signals from these circuits is arranged in a common module unit, and a key entry circuit 11, a display device 12, a frequency control circuit 7, a transformer circuit 14, and a power circuit 13 including a power supply backup circuit 15 are arranged on the same circuit board.
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