| 摘要 |
PURPOSE: A door lock with a touch pad and unlocking of the same are provided to prevent the leakage of secret number to a third party person by dividing a long input signal and a short input signal. CONSTITUTION: A filter(20) passes a signal over a set value from a plurality of input signals, divided into a long input signal and a short input signal, which is transmitted from a touch pad(10). An A/D converter(30) changes the input signal which is passed through the filter into a digital signal. A first memory(40) receives a plurality of digital signals and stores the digital signal successively after diving them into a long input signal and a short input signal. An MCU(50) compares the input number stored in a first memory with the predetermined number stored in a second memory.
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