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HF-Fax (2097 words) |
 | A digitally encoded facsimile signal is a series of two-valued currents, one for the binary digit 0, the other for the digit 1; it thus resembles the two-valued signal used for fl-and-white copy and is transmitted in the same fashion. |
| Facsimile was invented in 1842 by the Scotsman Alexander Bain. |
| Facsimile transmission and computer graphics are related fields, using methods closely similar in principle and detail. |
| Definition: facsimile (683 words) |
| A form of telegraphy for the transmission of fixed images, with or without half-tones, with a view to their reproduction in a permanent form. |
| Group 2 Facsimile: The mode of fl and white facsimile operation, defined in ITU-T Recommendation T.3, that accomplishes bandwidth compression by using encoding and vestigial sideband, but excludes processing of the document signal to reduce redundancy. |
| Group 3 Facsimile: The mode of fl and white facsimile operation, defined in ITU-T Recommendation T.4, that incorporates means for reducing the redundant information in the signal by using a one-dimensional run-length coding scheme prior to the modulation process. |
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