Receiving circuit and receiving method
First Claim
1. A receiving circuit that receives a plurality of digital signals output from a wireless smart key system and a tire pressure monitoring system, comprising:
- an antenna that receives the plurality of signals generated by modulating carrier waves having a substantially same frequency according to digital signals having different bitrates output from the wireless smart key and tire pressure systems;
a front-end portion that tunes and outputs the signals received by the antenna;
an analog-to-digital converting portion that converts the signals output from the front-end portion to digital signals;
a signal processing portion that processes and demodulates the digital signals;
a transmitting portion that transmits a request signal to a portable device; and
a variable digital filter portion in which a passband is switched in accordance with a bitrate of a digital signal output from the wireless smart key system for a predetermined time after the transmitting portion transmits the request signal to the portable device, and which extracts the digital signal output from the wireless smart key system from the demodulated signals output from the signal processing portion.
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Accused Products
Abstract
A received circuit receives a plurality signals generated by modulating carrier waves having the substantial same frequency according to digital signals having different bitrates output from a plurality of systems. The receiving circuit includes a front-end portion that tunes and outputs the signals received by an antenna; an analog-to-digital converting portion that converts the signals output from the front-end portion to digital signals; a signal processing portion that processes and demodulates the digital signals; and a plurality of digital filter portions each of which extracts a digital signal output from a corresponding system among the plurality of systems, from the demodulated signals output from the signal processing portion, based on a bitrate of the digital signal output from the corresponding system.
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Citations
11 Claims
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1. A receiving circuit that receives a plurality of digital signals output from a wireless smart key system and a tire pressure monitoring system, comprising:
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an antenna that receives the plurality of signals generated by modulating carrier waves having a substantially same frequency according to digital signals having different bitrates output from the wireless smart key and tire pressure systems; a front-end portion that tunes and outputs the signals received by the antenna; an analog-to-digital converting portion that converts the signals output from the front-end portion to digital signals; a signal processing portion that processes and demodulates the digital signals; a transmitting portion that transmits a request signal to a portable device; and a variable digital filter portion in which a passband is switched in accordance with a bitrate of a digital signal output from the wireless smart key system for a predetermined time after the transmitting portion transmits the request signal to the portable device, and which extracts the digital signal output from the wireless smart key system from the demodulated signals output from the signal processing portion. - View Dependent Claims (2, 3, 4, 5)
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6. A method of receiving a plurality of digital signals output from a wireless smart key system and a tire pressure monitoring system;
- comprising;
receiving the plurality of signals generated by modulating carrier waves having a substantially same frequency according to digital signals having different bitrates output from the wireless smart key and tire pressure systems; tuning and outputting the signals received by an antenna; converting the output signals to digital signals; processing and demodulating the digital signals; transmitting a request signal to a portable device; switching a passband of a variable digital filter in accordance with a bitrate of a digital signal output from the wireless smart key system for a predetermined time after transmitting the request signal to the portable device; and extracting the digital signal output from the wireless smart key system from the demodulated digital signals. - View Dependent Claims (7, 8)
- comprising;
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9. A method of receiving a plurality of digital signals from a wireless smart key system and a tire pressure monitoring system, comprising:
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receiving the plurality of signals generated by modulating carrier waves having a substantially same frequency according to digital signals having different bitrates output from the wireless smart key and tire pressure systems; tuning and outputting the signals received by an antenna; converting the output signals to digital signals; processing and demodulating the digital signals; transmitting a request signal to a portable device; switching a passband of a variable digital filter in accordance with a bitrate of a digital signal output from a system designated among the wireless smart key and tire pressure systems; and extracting the digital signal output from the designated system, from the demodulated signals, by passing the demodulated signals through the variable digital filter. - View Dependent Claims (10, 11)
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Specification