PURPOSE: To provide a wireless security device which improves the noise resistance.
CONSTITUTION: The wireless security device includes a frequency analyzing means which divies the signals equivalent to one cycle of the signal that can be extracted from a section where an answer signal should be included, a neural network 9 which is connected to the frequency analyzing means through the input layer of the network and previously learnt so as to output through an output layer the affirmative value when the signals including an answer signal are supplied through the input layer and to output the negative value when only the noises are supplied through the input layer respectively, and a deciding means 10 which decides the presence of absence of an answer signal by the output value of the network 9. In such a constitution, a state monitoring part 1 decides the presence or absence of the answer signal received from a sensor part 2.
MASAKADO AKIROU
Next Patent: WIRELESS SECURITY DEVICE