Hardware implementation of 4-pixel code encoder

Facsimile and static presentation processing – Facsimile – Recording apparatus

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340347DD, H04N 140

Patent

active

043273793

ABSTRACT:
A circuit to encode image data. The circuit receives image data in four bit nibbles which are either all-zero nibbles or terminating nibbles containing at least one non-zero bit. The circuit output is a series of code words, each a multiple of four bits and up to twenty-four bits long, packed into eight bit output words. Each code word contains a first part containing a run length specifying the number of received all-zero nibbles and a second part specifying the bit pattern of the terminating nibble. The circuit uses PROMs for the look-up and control elements and a pipeline of registers to allow high speed operation.

REFERENCES:
patent: 3588329 (1971-06-01), Monk

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