Browse Prior Art Database

Interference Elimination for Remote Keyboards for Computers

IP.com Disclosure Number: IPCOM000110232D
Original Publication Date: 1992-Oct-01
Included in the Prior Art Database: 2005-Mar-25
Document File: 1 page(s) / 44K

Publishing Venue

IBM

Related People

Balasubramanian, PS: AUTHOR [+2]

Abstract

Remote detachable keyboards have been around for a while, but many of these have a potential problem when more than one of the same type are used in the same proximity. The problem is that one keyboard may interfere with the operation of another, or be received by a different computer than the one intended. The more sensitive transducers used in modern equipment magnifies the magnitude of the problem. The common implementation uses IR (optical) transducers to transmit the data from the keyboard to the computer. A simple serial-type data stream, replacing the cable serial data cable normally used, will be receivable by almost any PC using the same data conventions, so the keyboard data may activate and be received by another computer in the same room, one not intended to be a target for the keyboard.

This text was extracted from an ASCII text file.
This is the abbreviated version, containing approximately 90% of the total text.

Interference Elimination for Remote Keyboards for Computers

      Remote detachable keyboards have been around for a while, but
many of these have a potential problem when more than one of the same
type are used in the same proximity.  The problem is that one
keyboard may interfere with the operation of another, or be received
by a different computer than the one intended.  The more sensitive
transducers used in modern equipment magnifies the magnitude of the
problem.  The common implementation uses IR (optical) transducers to
transmit the data from the keyboard to the computer.  A simple
serial-type data stream, replacing the cable serial data cable
normally used, will be receivable by almost any PC using the same
data conventions, so the keyboard data may activate and be received
by another computer in the same room, one not intended to be a target
for the keyboard.  As notebooks and portable devices become more
commonplace, the severity of the problem will increase. The data
transmitted by the keyboard must be changed from a simple serial data
stream to one which contains a unique address header preceding the
byte or bytes of data.  The receiver will not pass on to the computer
any data which does not have the correct address header.  The
receiver will remove the address header and only pass on the data
byte, in the correct format to the computer so the operation of the
filter is transparent to the computer.  The implementation of this
method can be accomplis...