| 摘要 |
<p>PURPOSE:To prevent radio communication equipment from being used illegally by performing stop control over input/output operation according to the phase difference between dummy noise code signals as objects of spread spectrum processing and reverse spread spectrum processing. CONSTITUTION:An input signal S6 and an output signal S5 are sent to and from a slave station 1 by the spread spectrum processing to obtain high secrecy and disturbance, and the distance to the slave station 1 is detected from the phase difference between the dummy noise code signal SPN2 and DSPN2 used for the spread spectrum processing and reverse spread spectrum processing. For the purpose, the input operation for an input signal S6 or the output operation for an output signal S5 is brought under stop control according to the phase difference, and then when the slave station 1 is positioned with a prescribed range of a price of radio communication equipment 2, communication is made through the radio communication equipment 2. Consequently, illegal use is prevented even if the code of a password, etc., assigned to the slave station is coincident.</p> |
