Apparatus and algorithm for compressing and decompressing data

Details Apparatus and algorithm for compressing and decompressing data Apparatus and algorithm for compressing and decompressing data

1985-06-11

1986-12-02

Shoop, Jr., William M.

Communications: electrical

Audible indication

Percussion-type sound producer

358261, H03K 1300

Patent

active

046268243

ABSTRACT:
A compression and a decompression algorithm resides in a memory of a data processing system. The data processing system communicates to another data processing system via an input/output means and a telecommunications network. When a message, to be communicated to the other data processing system, is ready for transmission, the data processing system compresses the message data. A processor of the data processing system compresses the data using the compression algorithm stored in the memory of the data processing system. The compression algorithm: identifies a mask character in the data representing the most frequently occurring character in the data, develops a mask byte in association with the mask character, the mask byte identifying the locations of the mask character in the data and identifying the locations of each portion of a residual message associated with the data, and develops the residual message, the residual message representing the message data with the mask character extracted from the message data.

REFERENCES:
patent: 4117470 (1978-09-01), Elliott
patent: 4192010 (1980-03-01), Kerner et al.
patent: 4420771 (1983-12-01), Pirsch
patent: 4542515 (1985-09-01), Gutleber

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