Dot matrix printer having reduced bit map data storage

Details Dot matrix printer having reduced bit map data storage Dot matrix printer having reduced bit map data storage

1992-12-04

1999-05-11

Sax, Steven P.

395115, G06K15/00

Patent

active

059037156

ABSTRACT:
A bit map data generator section prepares bit map data on the basis of data received from a host computer. A null-series removal section removes data series of null from the bit map data. A data compressor compresses the remaining bit map data using a plurality of different compression modes. A comparator compares the sizes of the compressed data produced by the different compression modes. Of the compressed data, the compressed data of the smallest size is stored in a RAM by a register section. When the supplemental character data is printed out, the compression mode by which it was compressed is discriminated by a compression mode discriminator. The data is transferred to a compressed-data restoring section corresponding to the discriminated compression mode, and then to a null-series restoring section. The null-series restoring section restores the data into the original bit map data, that is, the bit map data before compression.

REFERENCES:
patent: 5058187 (1991-10-01), Kim
patent: 5150454 (1992-09-01), Wood et al.
patent: 5207517 (1993-05-01), Ito
patent: 5208676 (1993-05-01), Inui
patent: 5272768 (1993-12-01), Bauman et al.

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