SYSTEM/METHOD FOR UPDATING OPERATING CODE, MODEM AND METHOD FOR IMPROVING GRADE OF OPERATING CODE

摘要

PROBLEM TO BE SOLVED: To realize a re-programmable modulation/demodulation system in which changing firmware having an operating code stored therein can be changed or upgraded by remote control or without removing or replacing parts and without requiring time of an engineer and a special tool. SOLUTION: The updated operating code and parameters can be reprogrammed into the modulation/demodulation system without replacing the hardware of the modulation/demodulation system, which includes a memory chip re-programmable within a circuit in which the operating code and the parameters are stored. Two control programs control re-programming of the updated operating code. One of them is designed for manufacturing or testing purposes and the other allows reprogramming of the updated operating code or parameters from a remote place.