Receiver for tire condition monitoring apparatus
First Claim
1. A receiver for a tire condition monitoring apparatus, the receiver receiving a tire condition detection signal transmitted from a transmitter provided in a tire of a vehicle on a modulated wave, the receiver comprising:
- at least two reception antennas, which receive the modulated wave;
a selecting section, which alternately selects one of the at least two reception antennas at a predetermined switching cycle to alternately obtain the modulated wave from the at least two reception antennas; and
a demodulation section, which generates a demodulated signal by demodulating the modulated wave obtained at the selecting section,wherein the switching cycle is half or less of the transmission time of data per symbol in the tire condition detection signal.
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Accused Products
Abstract
A receiver includes two reception antennas, which receive a modulated wave (transmission signal) from each of transmitters, a selection circuit, which alternately selects one of the two reception antennas at a predetermined switching cycle to alternately obtain the modulated wave from the two reception antennas, and a demodulation section, which generates a demodulated signal by demodulating the modulated wave obtained at the selection circuit. The switching cycle is 27 μs, which is 1/7.4 of the transmission time of data per symbol in the transmission signal from each transmitter, that is, 200 μs. In other words, the modulated waves from the two reception antennas are alternately obtained at least seven times each while the data of one symbol is transmitted.
18 Citations
8 Claims
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1. A receiver for a tire condition monitoring apparatus, the receiver receiving a tire condition detection signal transmitted from a transmitter provided in a tire of a vehicle on a modulated wave, the receiver comprising:
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at least two reception antennas, which receive the modulated wave; a selecting section, which alternately selects one of the at least two reception antennas at a predetermined switching cycle to alternately obtain the modulated wave from the at least two reception antennas; and a demodulation section, which generates a demodulated signal by demodulating the modulated wave obtained at the selecting section, wherein the switching cycle is half or less of the transmission time of data per symbol in the tire condition detection signal. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A receiver for a tire condition monitoring apparatus, the receiver receiving a tire condition detection signal transmitted from a transmitter provided in a tire of a vehicle on a modulated wave, the receiver comprising:
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at least two reception antennas, which receive the modulated wave; a selecting section, which alternately selects one of the at least two reception antennas at a predetermined switching frequency to alternately obtain the modulated wave from the at least two reception antennas; and a demodulation section, which generates a demodulated signal by demodulating the modulated wave obtained at the selecting section, wherein the switching frequency (Hz) is twice or more of a symbol rate (baud) of the tire condition detection signal.
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8. A method for receiving a tire condition detection signal transmitted from a transmitter provided in a tire of a vehicle on a modulated wave by a receiver provided in a vehicle body, the method comprising:
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receiving the modulated wave by at least two reception antennas; alternately selecting the at least two reception antennas at a predetermined switching cycle to alternately obtain the modulated wave from the at least two reception antennas, wherein the switching cycle is half or less of the transmission time of data per symbol in the tire condition detection signal; and generating a demodulated signal by demodulating the modulated wave obtained alternately.
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Specification