Teletype compatible facsimile recorder

DETAILED DESCRIPTION I claim: 1.
A facsimile system for recording graphic signals comprising: a facsimile signal channel carrying electrical signals in raster format; a teletype signal channel carrying electrical signals in pulse code format; a graphic signal printer for recording electrical signals in a raster format; and switch means for selectively connecting the facsimile channel or the teletype channel to the printer; wherein the teletype channel includes signal conversion means responsive to teletype signals to produce corresponding signals in raster format utilized by the printer so that both facsimile and teletype signals can be printed at the selection of the switch means.
2.
A system according to claim 1 wherein the signal conversion means comprises a character generator.
3.
A system according to claim 2 wherein the character generator comprises an electronic look-up table responsive to pulse coded signals to read out raster scan signals.
4.
A system according to claim 1 including electronic means responsive to serially received signals to generate corresponding parallel signals.
5.
A system according to claim 1 including control means responsive to the receipt of teletype signals to transfer the switch means so as to select the teletype channel.




Description:
BACKGROUND OF THE INVENTION Facsimile signals representing graphic original material are generated by scanning the graphic original line by line to produce a rectangular array of generally parallel horizontal lines known as a raster familiar on television screens.
Each line of the raster is a series of analog or digital pulses.
The facsimile recorder which receives the facsimile signals prints them line by line on sensitive paper fed by a linear printing head.
Teletype signals represent alphanumeric characters of a predetermined configuration as compared to the random graphic elements of a facsimile weather map, for example, and are transmitted in a seven bit dot-dash code with a combination of five pulses for each character