Patent ID: 7561889

Claim:
An alarm apparatus which is used for intercepting a mobile signal generated from a mobile phone and is equipped within a use prohibition area under an environment of a mobile network communication between a base station area and said mobile phone, said base station area producing a control signal reachable to said mobile phone within an administration area, said mobile signal including both a response signal in response to said control signal and a positioning signal indicative of a present position of said mobile phone with a kind of communication system prescribed, said alarm apparatus for producing a use prohibition alarm to a user of said mobile phone when said mobile phone is present within said use prohibition area, said alarm apparatus comprising: receiving means disposed within said use prohibition area to receive said response signal and/or said positioning signal; system discriminating means for discriminating said communication system from said response signal and/or said positioning signal to produce a communication system information indicative of said kind of communication system of said mobile phone; and alarm producing means for specifying said kind of communication system and producing said use prohibition alarm in correspondence to said communication system information; wherein said system discriminating means comprises a processing section for counting the receiving times number, in such a way that a level judgment signal is produced so as to be indicative of judging whether or not the receiving times number is less than a predetermined value; and an alarm control section for controlling to produce an alarm control signal indicative of a first use prohibition alarm signal if said level judgment signal is indicative of being less than said predetermined value, otherwise to produce another control signal indicative of a second use prohibition alarm signal.