Communications: electrical – Continuously variable indicating – With meter reading
Reexamination Certificate
1998-11-10
2001-12-25
Horabik, Michael (Department: 2635)
Communications: electrical
Continuously variable indicating
With meter reading
C455S107000, C455S121000, C455S129000, C340S870030, C341S176000
Reexamination Certificate
active
06333698
ABSTRACT:
BACKGROUND OF THE INVENTION
The present invention relates generally to wireless transmitters, particularly for vehicles.
Increasing numbers of new vehicles are being sold with trainable transmitters permanently installed in the vehicle. The trainable transmitters allow consumers to train the transmitter to duplicate an existing transmitter, such as a garage door opener. The current trainable transmitters pre-store a plurality of cryptographic algorithms allowing the trainable transmitter to be universal. This provides convenience to the consumer by allowing the trainable transmitter to be compatible with many home products, such as garage door openers.
The known universal trainable transmitter may not be capable of generating frequencies for all garage door openers or other home security systems. The transmitter may include a plurality of RF oscillators, each capable of generating an RF signal of a frequency associated with garage door openers or other home security systems. The transmitter may not include oscillators for generating the right frequencies of all home security systems. Further, security system manufacturers may begin using additional frequencies not originally provided in the trainable transmitter.
SUMMARY OF THE INVENTION
The present invention provides the ability to accommodate any frequency of an existing transmitter/receiver system in the trainable transmitter. A trainable transmitter according to the present invention includes a socket for receiving removable, replaceable plug-in modules which expand the frequency transmission capability of the transmitter. Preferably, the transmitter includes a socket into which the consumer can install a plug-in module which includes some of the electrical components for generating the RF signal at the new frequency. In this manner, if the trainable transmitter is initially unable to transmit the frequency of the user's receiver system, the user can obtain the correct plug-in module to connect to the trainable transmitter in order to expand the frequency transmission capability of the transmitter.
Alternatively, a repeater can be installed adjacent the receiver which receives a code at the new frequency. The repeater includes a receiver and code detection circuitry which is compatible with the trainable transmitter. The repeater also includes a transmitter which generates the code at the new frequency when the receiver and code detection circuitry in the repeater receive the correct signal from the trainable transmitter. Alternatively, the repeater can include the original transmitter from the transmitter/receiver system. The receiver and the repeater can be coupled either electrically or mechanically (i.e., the push button) to the original transmitter. In this manner, the transmitter can be utilized with any existing transmitter/receiver system, since the transmitter need not be capable of transmitting at the frequency or learning the encryption algorithm of the original transmitter/receiver system.
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Brooks & Kushman P.C.
Horabik Michael
Lear Automotive Dearborn Inc.
Shimizu M
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