| 摘要 |
PURPOSE: An expansion pack for an information terminal is provided to realize audio and data communication and to reduce the size of an information terminal. CONSTITUTION: An expansion pack(200) for an information terminal includes a data communication unit(210), an audio communication unit(220), an expansion unit(230), a power supply unit(240), and an alarm unit(250). The data communication unit consists of a radio frequency receiving unit(211), a data communication unit(212), and a radio frequency transmitting unit(213). The data communication unit transmits the data obtained by decoding the demodulated digital signals transmitted from the radio frequency receiving unit to a control unit(110). The audio communication unit consists of an audio processing unit(221) and a telephone calling unit(222). The telephone calling unit consists of a speaker, a microphone, and an earphone terminal. The expansion unit consists of a connector(231), an expansion part(232), and a connection control unit(233). The connector is combined to a connecting terminal to circuit-connect an information terminal(100) with the expansion pack.
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