Vehicle accessory trainable transmitter
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United States of America Patent
Stats
-
Dec 26, 1995
Issued Date -
N/A
app pub date -
Jun 21, 1994
filing date -
Dec 5, 1988
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
A vehicle accessory includes a trainable transmitter for duplicating the signal of an existing remote control. In one embodiment, the system includes a variable frequency generator having a frequency control input and an output. In one embodiment, also, the transmitter includes a switch for selectively disabling the variable frequency generator. According to another embodiment, the transmitter is trained by adjusting the frequency of the signal output by the variable frequency generator until it matches a signal transmitted by an existing remote control for a garage door opening mechanism. According to another embodiment, a variable attenuator is controlled to adjust the magnitude of the output signal of the variable frequency generator in inverse relationship to the duty cycle of output signals therefrom.
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