| 摘要 |
PURPOSE:To reduce the cost by controlling a code generating section in response to the content read from a nonvolatile memory and using a single code generator for plural equipments in common. CONSTITUTION:A CPU 9 reads a number unique to each equipment stored by an E<2>PR)M 11 according to the program of a ROM 12 and stores the number in a built-in RAM. The CPU 9 receiving a communication start requesting signal from each I/F 13 read the data unique to the equipment stored in the built-in RAM and writes the data to an output port 10 and the port 10 controls a code generating section 6 with the output data. A code generator 7 generates N-kinds of pattern codes and a selector 8 selects the required pattern and inputs it to a spread modulator 2. The modulator 2 implements addition taking 2 as a modulus with the input data 1 and the result is mixed with the output of a local oscillator 4 and the result is outputted via a transmission filter 5. The inverse spread demodulation is similarly implemented. Thus, plural equipments use a common code generator to reduce the cost. |
