Panasonic 990 - Manual (Page 166)

ITU)=T Imaoe IM©„ 1
All specifications are based on the ITU-T Image No. 1 (The sample shown below is not to scale).
THE SLEREXE COMPANY LIMITED
SAPORS LANE - BOOLE - DORSET . BH 25 8 ER
TEI£PtlONE KUU
(945 13) 51617
- TELEX
123456
Our Ref. 350/PJC/EAC I8th January, 1972.
Dr. P.N. Cundall,
Mining Surveys Ltd.,
Holroyd Road,
Reading,
Berks.
Dear Pete,
Permit me to introduce you to the facility of facsimile
transmission.
In facsimile a photocell is caused to perform a raster scan over
the subject copy. The variations of print density on the document
cause the photocell to generate an analogous electrical video signal.
This signal is used to modulate a carrier, which is transmitted to a
remote destination over a radio or cable communications link.
At the remote terminal, demodulation reconstructs the video
signal, which is used to modulate the density of print produced by a
printing device. This device is scanning in a raster scan synchronised
with that at the transmitting terminal. As a result, a facsimile
copy of the subject document is produced.
Probably you have uses for this facility in your organisation.
Yours sincerely,
rJd.
P.J. CROSS
Group Leader - Facsimile Research
Ktcivtered in No. SO^d
Rtf'Stercd Offic«: ViCBrt L.«n4. Ilford. Em *x.
166