Browse Prior Art Database

LOW-COST USER ACTIVITY MONITOR FOR PORTABLE OR MOBILE RADIOS

IP.com Disclosure Number: IPCOM000009693D
Original Publication Date: 2000-Jan-01
Included in the Prior Art Database: 2002-Sep-11
Document File: 2 page(s) / 129K

Publishing Venue

Motorola

Related People

David Wheeler: AUTHOR [+3]

Abstract

A portable radio with a 'deadman' feature com- prising a timer. If the radio does not detect motion by the radio's user before the timer times out, then the user is warned. If the user does not respond, then the radio instigates an emergency routine.

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Technical Developments

there is a possible emergency situation (the user has fallen or been knocked down) and sounds a warning that an emergency signal will be transmitted unless the radio is brought into an upright position.

  'Deadman' requires a trembler switch (also usu- ally mercury) to sense the movement of the user. The output from the switch, caused by the move- ment of the user, continually interrupts the radio's microprocessor, indicating that the radio user is 'active'. If the user remains still more than a prede- termined length of time, the radio 'bleeps' to warn the user that if further movement is not detected within an additional predetermined time, the radio will initiate transmission of an emergency signal to alert the controller of a possible emergency situa- tion. Both of these features require the addition of a switch and associated circuitry, usually attached externally, via the accessory connector.

  A third alternative, known as 'Guard Tour', is a feature used by security firms. 'Keys', located at strategic points on the premises, are plugged in to the radio temporarily as the guard patrols on his nor- mal tour. Any omission or anomaly in the sequence can be thus be detected and a signal initiated to warn the controller of a pending emergency.

PROPOSED SOLUTION TO THE PROBLEM

  This idea is a low-cost implementation of the 'Deadman' feature. However, no switch is required.

  The radio utilizes a simple software timer, with a predetermined, programmable length, which will 'bleep' when the time expires. This bleep warns the radio user that an emergency, or other predeter- mined sequence, will be triggered unless the user takes some physical action, such as pressing the monitor button or entering a simple code via the keypad. Depending on the application, the warning could be a short, discrete 'bleep' or it could be a

0 Motomla, Inc. xxx 111 January 2000

LOW-COST USER ACTIVITY MONITOR FOR PORTABLE OR MOBILE RADIOS

by David Wheeler, Chris Wright and Yong Zhang

ABSTRACT

  A portable radio with a 'deadman' feature com- prising a timer. If the radio does not detect motion by the radio's user before the timer times out, then the user is warned. If the user does not respond, then the radio instigates an emergency routine.

  The radio may be used, for example, by security guards. It may also be used to enable remote moni- toring of dependent persons such as children.

INTRODUCTION

  This paper describes a simple, low cost method of providing an ability for a radio user to keep a col- league or supervisor informed of his activities by means of positive feedback. Traditionally, this has required additional, expensive accessories. However, the method described here uses only the radio's microprocessor and requires no additional components.

PROBLEM TO BE SOLVED

  Historically, monitoring the activity level of a radio user has required additional, external compo- nents. Here, 'activity' means physical movement by the radio user, and the u...