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USING THE SPELLER CHECK FEATURE AS A DATA ERROR CORRECTING TECHNIQUE

IP.com Disclosure Number: IPCOM000006871D
Original Publication Date: 1993-Jun-01
Included in the Prior Art Database: 2002-Feb-07
Document File: 3 page(s) / 130K

Publishing Venue

Motorola

Related People

Phillip Partipilo: AUTHOR [+2]

Abstract

It is common knowledge that the paging probability vs. signal strength performance of digital "%Ipha/Nu- meric" pagers is worst than the "Tone Only" pagers. One major reason is due to the "error correcting for- mat" chosen for the alpha message characters is not the same as the "address data" format. That is, more bits can be corrupted or missed in the pager's unique "address code" than it can in the "alpha message" and still alert the proper pager. The net result is that even though the pager's unique address is detected in a weak signal envi- ronment the user is not alerted if the alpha message is too corrupted for proper identification by the pager.

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MOTOROLA INC. Technical Developments Volume 19 June 1993

USING THE SPELLER CHECK FEATURE AS A DATA ERROR CORRECTING TECHNIQUE

by Phillip Partipilo and Paul Bodet

  It is common knowledge that the paging probability vs. signal strength performance of digital "%Ipha/Nu- meric" pagers is worst than the "Tone Only" pagers. One major reason is due to the "error correcting for- mat" chosen for the alpha message characters is not the same as the "address data" format. That is, more bits can be corrupted or missed in the pager's unique "address code" than it can in the "alpha message" and still alert the proper pager. The net result is that even though the pager's unique address is detected in a weak signal envi- ronment the user is not alerted if the alpha message is too corrupted for proper identification by the pager.

  One technique to deal with the above described lim- itation, without increasing decoder circuitry complexity, is to offer a customer options like "beep on bad data? With this option the pager is alerted even though the data message is corrupted. The corrupted data is simply presented to the user as received. It is then let? up to the user to discern the message.

  The authors' proposal is to implement the "spell check" feature as another vehicle to enhance the "data correction" algorithm in pagers and/or alphanumeric data entry devices. Integrating the spell check algorithm in the pager's decoding circuitry, the corrupted digital alpha message is corrected through the "spell check"

dictionary. The best matching words are selected and presented on the display to the end user. A block dia- gram of such contiguration is illustrated in Figure 1.

  Upon receiving a message with unrecognizable words, the decoder CPU will search the dictionary mem- ory and allocate p...