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PAGER HAVING CONTEXT DEPENDENT DISPLAY OF ERROR CORRECTED MESSAGES

IP.com Disclosure Number: IPCOM000006394D
Original Publication Date: 1992-May-01
Included in the Prior Art Database: 2001-Dec-31
Document File: 1 page(s) / 63K

Publishing Venue

Motorola

Related People

Kazimierz (Kai) Siwiak I: AUTHOR

Abstract

Digital messages may contain bit errors when sent over a radio channel. Error correcting codes generally provide some measure of error correction. As an exam- ple, take a (32,21) code composed of a BCH (31,21) code plus one additional check sum bit. This particular code detects up to 3 bit errors per word, can correct up to two errors, and has a code distance of 6. In decoding and error correcting, falsing to the wrong decoded characters is a possibility.

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MOTOROLA INC. Technical Developments volume 15 May 1992

PAGER HAVING CONTEXT DEPENDENT DiSPlAY OF ERROR CORRECTED MESSAGE+

by Kazimierz (Kai) Siwiak I,

  Digital messages may contain bit errors when sent over a radio channel. Error correcting codes generally provide some measure of error correction. As an exam- ple, take a (32,21) code composed of a BCH (31,21) code plus one additional check sum bit. This particular code detects up to 3 bit errors per word, can correct up to two errors, and has a code distance of 6. In decoding and error correcting, falsing to the wrong decoded characters is a possibility.

  Such falsing has minor consequences in an alphabetic message because of the inherent redundancy of the written word. We can tolerate misspelled words. Numeric data is far more sensitive. An error in a numeric field is not normally recoverable from context alone. This hierarchy of error tolerance is the basis of a "smart" error correcting pager which:

1) Detect errors in code words and corrects up to

2 errors.
2) If the message is entirely alphabetic, then display:
a) all correct characters,
b) all corrected characters,
c) all alphabetic characters that have 3 or more errors, but mark these by inverse video, blink- ing, underline or other means.
3) If the message contains number fields,
a) all correct numbers,
b) all corrected numbers (2 or fewer errors per code word),

c) blank out or replace with a neutral symbol (*, #, etc.) all numbers in a number field wit...