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Infrared Transmitter With Dual Power Levels

IP.com Disclosure Number: IPCOM000038903D
Original Publication Date: 1987-Mar-01
Included in the Prior Art Database: 2005-Feb-01

Publishing Venue

IBM

Related People

Authors:
Bustamante, CM Zalph, WN [+details]

Abstract

A technique is described whereby an electrical circuit provides the capability to transmit infrared signals at two different power levels: a high transmit power level used for timing purposes and a low transmit power level used for transmission of data. By providing two levels of infrared transmission and used in conjunction with a correlation detector receiver, the distance of transmission is significantly increased. This is particularly useful when used in local area network (LAN) systems to increase throughput of information processing. The transmitter is designed to provide two levels of transmission of infrared light, first at a high power level, approaching five times higher transmit levels of power than the lower level of power used for data transmission.