Data communication device, air pressure monitoring system using thereof, and data communication method
First Claim
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1. A data communication device comprising:
- an antenna resonance circuit configured to receive a signal in the ASK (Amplitude Shift Keying) format, wherein said signal includes;
a preamble part containing a modulation wave with a predetermined pattern, anda data part containing a modulation wave with an arbitrary pattern;
a receiving circuit configured to demodulate a detection signal from said reception signal;
a timer configured to output an interruption signal every time when counting a first predetermined period of time;
an arithmetic processing device configured to be connected to said receiving circuit and to activate said timer based on a detection signal demodulated from said preamble part of said reception signal; and
a switch configured to short-circuit both end of said antenna resonance circuit during a second predetermined period of time based on said interruption signal, wherein said second predetermined period of time is different from said first predetermined period of time.
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Abstract
A data communication device includes: an antenna resonance circuit; a detection circuit; an arithmetic processing device; and a first switch. The antenna resonance circuit receives a signal in the ASK (Amplitude Shift Keying) format. The detection circuit demodulates a digital baseband signal based on the reception signal. The arithmetic processing device detects an appearance time of an edge in the demodulated digital baseband signal based on a preamble part of the reception signal. The first switch short-circuits both end of the antenna resonance circuit at first timing in synchronization with the appearance time of the edge.
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8 Claims
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1. A data communication device comprising:
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an antenna resonance circuit configured to receive a signal in the ASK (Amplitude Shift Keying) format, wherein said signal includes; a preamble part containing a modulation wave with a predetermined pattern, and a data part containing a modulation wave with an arbitrary pattern; a receiving circuit configured to demodulate a detection signal from said reception signal; a timer configured to output an interruption signal every time when counting a first predetermined period of time; an arithmetic processing device configured to be connected to said receiving circuit and to activate said timer based on a detection signal demodulated from said preamble part of said reception signal; and a switch configured to short-circuit both end of said antenna resonance circuit during a second predetermined period of time based on said interruption signal, wherein said second predetermined period of time is different from said first predetermined period of time. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. An air pressure monitoring system comprising:
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a data communication device; and a sensor initiator configured to transmit a signal in the ASK (Amplitude Shift Keying) format to said data communication device, wherein said signal includes; a preamble part containing a modulation wave with a predetermined pattern, and a data part containing a modulation wave with an arbitrary pattern, wherein said data communication device includes;
an antenna resonance circuit configured to receive a signal in the ASK format,a receiving circuit configured to demodulate a detection signal from said reception signal, a timer configured to output an interruption signal every time when counting a first predetermined period of time, an arithmetic processing device configured to be connected to said receiving circuit and to activate said timer based on a detection signal demodulated from said preamble part of said reception signal, and a switch configured to short-circuit both end of said antenna resonance circuit during a second predetermined period of time based on said interruption signal, wherein said second predetermined period of time is different from said first predetermined period of time, wherein detection of air pressure of a tire is started in response to a data based on the demodulated detection signal.
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Specification