Vehicle receiver system in which a single receiver circuit is controlled to receive signals transmitted from a plurality of remote devices having respectively different transmission frequencies
First Claim
1. A receiver system for installation in a motor vehicle, having a receiver apparatus comprising:
- a receiving antenna for receiving, as an antenna input signal, a plurality of modulated transmitted signals having respective ones of a predetermined plurality of carrier frequencies, anda receiver circuit controlled by a control signal for selecting one of said carrier frequencies as a currently determined one of a plurality of receiving frequencies, and comprising means for operating on said antenna input signal to obtain demodulated data from a received signal corresponding to said currently determined receiving frequency;
wherein said receiver system comprises transmission timing prediction means for supplying said control signal to said receiver circuit, andsaid transmission timing prediction means determines a value for said currently determined receiving frequency based on predetermined criteria relating to equipment of said vehicle.
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Accused Products
Abstract
A vehicle-mounted receiver system includes a receiver apparatus that is controlled for receiving, in common, transmissions from a plurality of external devices such as a remote key, smart key, etc., having respectively different transmission frequencies. The receiving frequency at the current time is selected based on criteria such as the insertion/non-insertion status of the ignition key, or whether an interrogation signal has been transmitted to a specific external device so that a response transmission is be received from that device during a specific time interval and the receiving frequency is to be set accordingly during that specific interval.
14 Citations
24 Claims
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1. A receiver system for installation in a motor vehicle, having a receiver apparatus comprising:
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a receiving antenna for receiving, as an antenna input signal, a plurality of modulated transmitted signals having respective ones of a predetermined plurality of carrier frequencies, and a receiver circuit controlled by a control signal for selecting one of said carrier frequencies as a currently determined one of a plurality of receiving frequencies, and comprising means for operating on said antenna input signal to obtain demodulated data from a received signal corresponding to said currently determined receiving frequency; wherein said receiver system comprises transmission timing prediction means for supplying said control signal to said receiver circuit, and said transmission timing prediction means determines a value for said currently determined receiving frequency based on predetermined criteria relating to equipment of said vehicle. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
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15. A method of operating a system in a motor vehicle, in which the system includes a receiving antenna and a receiving circuit, the method comprising:
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receiving, in the receiving antenna, as an antenna input signal, a plurality of modulated transmitted signals having respective ones of a predetermined plurality of carrier frequencies; controlling the receiving circuit by a control signal to select one of said carrier frequencies as a currently determined one of a plurality of receiving frequencies; and operating on said antenna input signal to obtain demodulated data from a received signal corresponding to said currently determined receiving frequency; wherein a value for the control signal is determined, to select one of the carrier frequencies as the currently determined receiving frequency, based on predetermined criteria relating to equipment of the vehicle, and said control signal is supplied to the receiver circuit to select one of the carrier frequencies as the currently determined one of a plurality of receiving frequencies. - View Dependent Claims (16, 17, 18, 19, 20, 21, 22, 23, 24)
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Specification