By using a device that operates reliably even during interference in a transmission path and with a greater listening capability, a portable transmitter (1) radiates a sequence of stimuli (A) to create a bi-directional data transmission path. After being r...

System has two assemblies transmitting frequencies (f1,f2). First signal is stabilized with phase lock loop, and third frequency (f3) formed. Second assembly signal is also phase locked, and produces signal equal to the first assembly frequency. Signal fro...

A remote keyless entry system including a keyless fob having a transmitter for remote transmission of a semi-passive function control signal to an automobile in which the user does not have to manually actuate the fob while it transitions with the user fro...

A vehicle access system includes a signaling device that provides an authorization signal from the user. The system controller performs a plurality of functions provided that a proper or valid authorization code is received from the signaling device. The s...

A security system suitable for a vehicle 10 is disclosed in which a security controller 12 communicates with one or more remote transponders 14. The security controller 12 includes a memory 16 in which is held recognition information which ties that securi...