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A METHOD FOR LOCATING A PORTABLE SUBSCRIBER UNIT VIA REMOTELY INITIATED HIGHLY AUDIBLE EMISSION FROM THE MISSING UNIT

IP.com Disclosure Number: IPCOM000008533D
Original Publication Date: 1997-Dec-01
Included in the Prior Art Database: 2002-Jun-20
Document File: 1 page(s) / 65K

Publishing Venue

Motorola

Related People

Marc W. Cassidy: AUTHOR

Abstract

If a radio is lost or a radio user is unconscious and cannot respond in an area where searching the area is not an easy task, such as a collapsed, or burning building, there is no current ability to pinpoint exactly where the radio or down user is. What is needed is the ability to selectively cause an individual unit to emit a very loud audible indica- tion so that searchers in the immediate vicinity can quickly locate the lost radio or downed user. This ability is also needed in the lowest end portables which are often used by hunters, hikers, skiers, climbers etc. who could either lose a radio in the field or themselves become hurt or unconscious.

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MOTOROLA Technical Developments

A METHOD FOR LOCATING A PORTABLE SUBSCRIBER UNIT VIA REMOTELY INITIATED HIGHLY AUDIBLE EMISSION FROM THE MISSING UNIT

by Marc W. Cassidy

  If a radio is lost or a radio user is unconscious and cannot respond in an area where searching the area is not an easy task, such as a collapsed, or burning building, there is no current ability to pinpoint exactly where the radio or down user is. What is needed is the ability to selectively cause an individual unit to emit a very loud audible indica- tion so that searchers in the immediate vicinity can quickly locate the lost radio or downed user. This ability is also needed in the lowest end portables which are often used by hunters, hikers, skiers, climbers etc. who could either lose a radio in the field or themselves become hurt or unconscious.

  This invention will allow dispatchers or other radio users, via available signalling, i.e. Trunked, MDC, DTMF, sub audible signalling etc., to signal a unit that is missing by means of a terminal, the radio keypad or by a preprogrammed button or switch. Upon reception of the locate command, the target unit will enter locate mode and emit an audible indication at full volume from its speaker or from a separate internal transducer that is capable of highly Audible emission. Ergonomic volume control will be disabled whether the internal speaker, or a separate internal transducer is being used to emit the locate mode audible indication.

  If an external...