Patent ID: 6930588
Filing Date: 2005-08-16
Classification: G07C

Abstract:
1. A key opening apparatus comprising: an antenna for receiving a first signal of slower transmission speed and a second signal of higher transmission speed, both the signals are modulated with a high frequency signal; a receiving section for receiving the signals received by the antenna; a first filter that passes the first signal supplied from the receiving section; a first comparator to which an output from the first filter is supplied; a first decoder for decoding an output from the first comparator; a second filter that passes the second signal supplied from the receiving section; a second comparator to which an output from the second filter is supplied; and a second decoder for decoding an output from the second comparator, wherein the receiving section receives and processes the first and the second signals in common, and the first and the second decoders process the signals using a microprocessor and outputs a result to an output terminal.