Image data processor having data bus switching circuit for chang

Details Image data processor having data bus switching circuit for chang Image data processor having data bus switching circuit for chang

1995-05-16

1997-11-11

Coles, Sr., Edward L.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

395102, 395106, 395112, 358444, 358445, 358447, G06F 1500, H04N 140

Patent

active

056872968

ABSTRACT:
An apparatus for processing original image data to produce print image data used by a printer, wherein a data bus switching circuit provided between an original image data memory and a shift register is selectively placed in a 1X mode or an NX mode. In the 1X mode, each bit of the original image data is transferred as a bit of the print image data to the shift register without conversion. In the NX mode, each bit of the original image data is converted into N (.gtoreq.2) number of bits of the print image data which have the same logical value equal to that of the original image data bit. The addresses of the shift register at which the print image data are sequentially stored are designated by an address counter based on a mode select signal and a write command for reading a set of the original image data for one line from the original image data memory. A read signal is generated for reading out a next set of the original image. data, on the basis of the mode select signal and a signal received from the printer when each line of image has been printed.

REFERENCES:
patent: 4122520 (1978-10-01), Adamchick et al.
patent: 5206741 (1993-04-01), Shimura et al.
patent: 5299028 (1994-03-01), Kwarta
patent: 5480236 (1996-01-01), Kawaoka
patent: 5528345 (1996-06-01), Hasegawa
patent: 5530901 (1996-06-01), Nitta

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