The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Oct. 17, 2000
Filed:
Feb. 20, 1996
Peter Robert McConnell, Burnaby, CA;
Robert Allan Scragg, Vancouver, CA;
Unity Wireless Systems Corporation, Vancouver, CA;
Abstract
A coded siren sound generator and a corresponding detector module are provided which allow uniquely coded tone patterns generated by the coded siren to be detected and processed such that only specific sirens will activate the detector module. In one embodiment, only a few codewords are sent by the transmitter. The receiver looks for the occurrence of one or more of these selected codewords and takes a predetermined action based on programming of the detector. The system may operate at audible or ultrasonic frequencies. In accordance with a further embodiment, audio (either audible or ultrasonic) 'packets' are sent by the transmitter These packets contain sufficient information to uniquely identify the vehicle sending the packet and allow the vehicle to send commands and data to the detector. The commands and data may be for purposes such as requesting emergency pre-emption for a left turn at an intersection, requesting straight ahead pre-emption, etc.