Patent ID: 8581695
Filing Date: 2013-11-12
Classification: E05F,G07C,G08C

Abstract:
1. A channel switching remote controlled barrier opening system, comprising: a transmitter operatively connected to: (a) perform iterative, sequential setting of an output frequency of a transmitter to multiple channels; and (b) on each of the channels, perform transmission of multiple copies of a message before tuning of the transmitter, at a transmitter-switching rate, to a next one of the multiple channels; a receiver operatively connected to: (a) perform iterative, sequential setting of a reception frequency of the receiver to the multiple channels at a receiver scan rate that is faster than the transmitter-switching rate; and (b) over each of the multiple channels, receive data for a period of time greater than that required for transmission of exactly one copy of the message; and (c) learn said transmitter by requiring successful receipt of at least two sequentially transmitted copies of the message on each of the multiple channels; and (d) respond to receipt of packets from said transmitter during a learn mode by determining whether said transmitter is already learned and, if so, opening a window of time during which another type of transmitter can be learned by temporarily lifting the requirement for successful receipt of at least two sequentially transmitted copies of the message on each of the multiple channels; and a barrier operator operatively connected to operate a device at least in part in response to receipt of a copy of the message on any of the multiple channels.