NUMERIC REDUNDANCY FOR ALPHANUMERIC INFORMATION TRANSMISSION
Original Publication Date: 1991-Dec-01
Included in the Prior Art Database: 2001-Dec-18
For wide are a alphanumeric paging and other similar services, there is a high price associated with achieving "near error free" transmission. At the fringe of cover- age, some errors are inevitable. Errors in the numeric portions of alphanumeric information are more unde- sirable than errors in the alpha portion since context is not generally very helpful for numeric information that may be associated with times, dates, currency amounts, etc. However, today, all information is coded in the same manner. An alternative is to provide additional coding only on the numeric portions, in effect compensating their lack of contextual redundancy without adding over- head to the more redundant alpha portions. In digitized compressed voice (vocoders), corruption of certain speech parameters produces signiticantly more detrimen- tal effect on the reconstructed speech than other param- eters. It is common to apply different levels of coding for transmission to different parameters on this basis.