Browse Prior Art Database

CELLULAR TELEPHONE CAR KIT ADAPTER

IP.com Disclosure Number: IPCOM000021351D
Original Publication Date: 2000-Nov-01
Included in the Prior Art Database: 2004-Jan-16
Document File: 1 page(s) / 20K

Publishing Venue

Sony Technical Digest

Related People

Daniel Alexander Chalfant: INVENTOR

Abstract

This invention is a car audio cassette adapter that utilizes the car's cassette player and stereo to create a hands-free cellular phone interface. This concept combines cassette adapter technology with external microphone technology, resulting in a portable handsfree kit for cellular telephones. The Cellular Telephone Car Kit Adapter can also be used with other cassette players such as portable cassette players or home stereos.

This text was extracted from a Microsoft Word document.
This is the abbreviated version, containing approximately 77% of the total text.

Sony Technical Digest, Volume 3, November 2000, ISSN 1521-5180

CELLULAR TELEPHONE CAR KIT ADAPTER

Invention by:

Daniel Alexander Chalfant

This invention is a car audio cassette adapter that utilizes the car's cassette player and stereo to create a hands-free cellular phone interface. This concept combines cassette adapter technology with external microphone technology, resulting in a portable handsĀ­free kit for cellular telephones. The Cellular Telephone Car Kit Adapter can also be used with other cassette players such as portable cassette players or home stereos.

The invention uses the headset jack output of a cellular telephone and a 2.5 - 3.5 mm plug for the input to the car system. A cord containing both speaker and microphone wires carries the input to the cassette adapter. The cassette adapter is similar to the Sony Discman Car Adapter model CPA-9, and transmits the incoming audio signal to the car speakers. An external microphone similar to the Foster model M368E01 is mounted in the cassette adapter, and picks up the operator's audio signal and transmits it to the cellular telephone.

The cassette adapter housing will also include a signal amplifier circuit to boost the signal above the levels set for telephone headsets. The amplifier circuit will use an NPN transistor. Either a battery or the automobile's cigarette lighter adapter (CLA) will power this amplifier circuit. The Car Kit Adapter concept includes a CLA Power Adapter that contains a DC power jack to provide...