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CORDLESS PHONE HANDS-FREE AMPLIFICATION UNIT

IP.com Disclosure Number: IPCOM000008448D
Original Publication Date: 1997-Dec-01
Included in the Prior Art Database: 2002-Jun-14
Document File: 3 page(s) / 123K

Publishing Venue

Motorola

Related People

Charles C. Vlamynck: AUTHOR

Abstract

Consumers have overwhelmingly evidenced an interest in cordless telephones. The problem is that most current Cordless and Cellular Phones do not have hands-free operation. This document describes an amplification unit for providing a hands-free operation which is both economical and possessing complete mobility of the user up to the range of the device to which the amplification unit is attached. The closest known technology is automobile based cellular units which have a headset that is restricted to the interior of the vehicle. All of these devices require the owner of the vehicle to hard mount a base unit within the vehicle. This in turn requires that the cellular unit remain in the vehicle since the base unit has a "plugged in head-set". It is a suitable operation for 'on the road travel' but does not allow the user to continue a conversation, in a hands-free mode, beyond the confines of the automobile. There are also a number of units available that will allow the user to have hands-free operation at a range of up to 25 feet. These units begin to generate static at approximately I3 feet depending on atmospheric conditions, lightning, and other environmental interferences. This latter restriction generally makes the units impractical for real mobility.

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MOTOROLA Technical Developments

CORDLESS PHONE HANDS-FREE AMPLIFICATION UNIT

by Charles C. Vlamynck

PROBLEM

  Consumers have overwhelmingly evidenced an interest in cordless telephones. The problem is that most current Cordless and Cellular Phones do not have hands-free operation. This document describes an amplification unit for providing a hands-free operation which is both economical and possessing complete mobility of the user up to the range of the device to which the amplification unit is attached. The closest known technology is automobile based cellular units which have a headset that is restricted to the interior of the vehicle. All of these devices require the owner of the vehicle to hard mount a base unit within the vehicle. This in turn requires that the cellular unit remain in the vehicle since the base unit has a "plugged in head-set". It is a suitable operation for 'on the road travel' but does not allow the user to continue a conversation, in a hands-free mode, beyond the confines of the automobile. There are also a number of units available that will allow the user to have hands-free operation at a range of up to 25 feet. These units begin to generate static at

approximately I3 feet depending on atmospheric conditions, lightning, and other environmental interferences. This latter restriction generally makes the units impractical for real mobility.

SOLUTION

  The above problem is solved by the creation of an amplification unit shown in use in Figure 1. The amplification unit couples to a headset worn by the user, and to a cordless telephone as shown. The amplification unit is belt worn with the cordless telephone, and is light, comfortable, self-contained, and self-powered (by rechargeable batteries), and is based upon the TDA7052 (1W Bridge Tied Load amplifier) which can deliver an output power of I .2 W (THD = lo%), internally fixed gain of 40db into an 8 ohm load with a power supply of 6V The TDA7052 is designed for battery-f...