Word autocorrelation redundancy match facsimile compression for text processing systems

Patent 4494150 Issued on January 15, 1985. Estimated Expiration Date:

July 13, 2002. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.

Abstract Claims Description Full Text

Patent References

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System for reducing the transmission time of similar portions of visible images
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Issued on: 05/11/1976
Inventor: Murayama

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Inventor: Cook

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Issued on: 10/18/1983
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Inventors

Application

No. 06/397704 filed on 07/13/1982

US Classes:

375/240, BANDWIDTH REDUCTION OR EXPANSION358/1.9Attribute control

Examiners

Primary: Britton, Howard W.
Assistant: Coles, Edward L.

Attorney, Agent or Firm

International Classes

H03M 7/46 (20060101)
H03M 7/42 (20060101)
H03M 7/48 (20060101)
H04N 1/411 (20060101)

Abstract

A method and system for compacting text data to be transmitted over communications lines and thereby reduce the data volume and transmission time. Transmitting and receiving text processing systems are provided identical library memories containing text strings such as words commonly used in correspondence. Each word in a document to be communicated is compared to the transmitting system's word library and, if found in the library, only the library address is transmitted. If the word is not found in the library, then it is added to the transmitting system's library, sent, and added to the receiving system's library. The receiving system reconstructs the document by using the received addresses to access the appropriate words from its library and place them in the document. The system combines this word match encoding with character match encoding and facsimile run length encoding for communicating words not found in the system library.