| 摘要 |
A facsimile transmission system employs a rotating drum at the transmitter upon which the original document is mounted and a synchronously rotating drum at the receiver having marking means for producing the facsimile. "Video" signals obtained by scanning the original document with a photosensitive device are made to modulate a carrier to convey black and white information by the relative proportions of 0 DEG and 180 DEG phases in the modulated carrier while the shade of black or white is conveyed by the amplitude of the modulated carrier. At the receiver, the modulated carrier is synchronously demodulated to recreate the video signals which are then used to control the marking means so as to produce a facsimile of the original document.
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