Lectron Products, Inc.

Reference Technology

Daniel G Douglas

Thomas J Waraksa

Richard E Kiefer

Lee H Gilbert

Keith D Fraley

A passive keyless entry system that is specifically adapted for use with automotive vehicles is designed to automatically unlock the vehicle as the operator approaches the vehicle. The system is further designed to automatically lock the vehicle as the operator, carrying the beacon, moves away from the vehicle. The system includes a portable beacon that is carried by the operator, a receiver/controller located in the vehicle, and an antenna connected to the receiver/controller for receiving the encoded transmission from the beacon. The beacon includes a motion sensor to conserve battery life when the beacon is stationary. Transmission between the beacon and the receiver/controller is characterized by a magnetically coupled radio frequency signal embodying differential phase encoded data with error correction coding of the data to enhance noise immunity and signal discrimination.

Passive keyless entry system

A passive keyless entry system is disclosed that is specifically adapted for use with automotive vehicles. The system is designed to automatically unlock the vehicle as the operator approaches the vehicle. The system is further designed to automatically lock the vehicle as the operator, carrying the beacon, moves away from the vehicle. The system includes a portable beacon that is carried by the operator, a receiver/controller located in the vehicle, and an antenna connected to the receiver/controller for receiving the encoded transmission from the beacon. The beacon includes a motion sensor to conserve battery life when the beacon is stationary. Transmission between the beacon and the receiver/controller is characterized by a magnetically coupled radio frequency signal embodying differential phase encoded data with error correction coding of the data to enhance noise immunity and signal discrimination.

A timing system is disclosed for reading symbol sites, analog or digital from a video signal preferable in a recorded laser format. A video signal having analog data events at precise timed intervals is recorded on a first commercial grade video recorder. The tape is replayed through a second commercial grade recorder to an optical lathe. At the time of playback to the optical lathe, a timing signal is derived from a phase lock loop circuit added to the second commercial grade and recorded on the FM band of the video signal, which signal is then etched by the lathe onto a master optical disc. Simultaneously with the recordation of the substantially continuous FM band, selected horizontal scans on each frame are loaded with both timing and reference level data, the timing portion of these selected scans being later used for phase comparison of the signal. An optical disc master results which has a continuous FM band timing track as well as an interleaved timing information contained in the video signal. Replication from the optical master to stamped copies occurs with the stamped copies being distributed to discrete players for data access. At each player, the continuous FM band timing track is used for the master clock. This continuous clock cycles a ramp generator with each clock pulse. Phase synchronization is taken from the selected horizontal scans distributed through each frame by having a phase comparator change the sample level of the cycled ramp. The changed level of the cycled ramp adjusts the phase of the master clock pulse. Precise readout of analog symbol event occurs in precise timed and phase corrected.

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Louisville, CO, United States of America

Daniel G Douglas