Browse Prior Art Database

Detector of Redundant High Order Data Codes

IP.com Disclosure Number: IPCOM000081489D
Original Publication Date: 1974-Jun-01
Included in the Prior Art Database: 2005-Feb-28
Document File: 2 page(s) / 32K

Publishing Venue

IBM

Related People

Schaeffer, HP: AUTHOR

Abstract

Strings of data codes for transmission may contain redundant high-order data, e.g., high-order zeros. Detection of redundant data enables transmission of useful data only, with a saving of transmission time and storage space in the receiving unit. If data codes for transmission becomes available serially, low-order first, the start position of redundant data codes in the code string must be found so that all further data can be suppressed.

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Detector of Redundant High Order Data Codes

Strings of data codes for transmission may contain redundant high-order data, e.g., high-order zeros. Detection of redundant data enables transmission of useful data only, with a saving of transmission time and storage space in the receiving unit. If data codes for transmission becomes available serially, low- order first, the start position of redundant data codes in the code string must be found so that all further data can be suppressed.

Detection of this redundancy start position is done by buffer 10 and counter
12. Data codes for transmission are first written into buffer 10. Counter 12 is incremented for each data code written, except those that would be redundant if in high-order positions. Thus, in the circuitry shown for high-order zero detection, counter 12 counts up for each character fed into buffer 10 except any character zero. After storing the complete data code string, data is read out of buffer 10 for transmission. Now, counter 12 is decremented for each data code never considered redundant. In the example, counter 12 counts down for each character read if not a zero. However, reading out buffer 10 is inhibited when counter 12 indicates nil. All data codes left in the buffer then are high-order redundant data which may be erased.

If alternate writes and reads are performed, a counter content nil indicates that all unquestionably significant data codes written into the buffer have been read out and trans...