| 摘要 |
PROBLEM TO BE SOLVED: To provide the ID code transmitter of a spectrum spreading system at low cost, without depending on a hardware and a receiver for the same by executing the operation of exclusive OR with a stored PN code through software processing for each bit of an ID code. SOLUTION: A modulation part 13 is composed of a CPU 9 and an EPROM 11, and prescribed software processing is executed to '1' or '0' per bit of desired digital information to be sent. The CPU 9 reads out an ID code 14 for each bit and operates the exclusive OR with a PN code 15. After this processing is performed over all the bits of the ID code 14, as 9 preamble data for synchronism establishment, the PN code 15 is added to the head of these data, provided by operating the exclusive OR. Then, output processing is performed as the demodulated data of a spectrum spreading system. Therefore, noise resistance and radio interference resistance can be improved, and a communication distance can be extended, without waking the hardware of conventional product large. |
