Two-dimensional coding apparatus

Details Two-dimensional coding apparatus Two-dimensional coding apparatus

1994-09-14

1995-12-26

Williams, Howard L.

Coded data generation or conversion

Digital code to digital code converters

358432, H03M 700

Patent

active

054791650

ABSTRACT:
A two-dimensional coding apparatus for two-dimensionally coding binary image data prepared by way of a FIFO memory, which reduces a time for which a host computer participates to enhance the speed of decoding processing. A two-dimensional coding circuit outputs a signal representing whether data to be read out from a memory are reference line data or coding line data, and in response to the signal and a signal read out from the memory, a circuit consisting of an invertor and a pair of AND gates outputs a read-out signal for a reference line FIFO memory and another read-out signal for a coding line FIFO memory. Consequently, the host computer need not control the memory address outputted from the two-dimensional coding circuit to fetch binary image data from the image data FIFO memory, and the FIFO memories can be used without special hardware means for the memory address control.

REFERENCES:
patent: 4800440 (1989-01-01), Kurokawa
patent: 4837848 (1989-06-01), Henderson et al.
patent: 4839738 (1989-06-01), Kaku et al.

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