AsampleofITU#1testchart(reducedto60.5%)
A sample of ITU #1 test chart (reduced to 60.5%)
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TIlE SLEREXE COMPANY LIMITED
SAPORS LANE - BOOLE ,_I_)RSI'; 1' _ BII 25 8 ER
I _I_EPIION_ BOOI,E(_)_5 13)5_617-"tELEX I_3_56
_x Ref. 3501PJC/EAC 18th Janua_u/, 1972.
DXo P.N. Cundall
Mining Surveys Ltd_
Holroyd Road,
Reading_
Rerks.
Dear Pete,
Permit me to introduce you to the facility of facsimile transmission.
In facsimile a photocell is caused to perform a _aster scan over the
subject Copy. The variations of print density on the doc_ent cause the
photocell to generate an analogous electrical video 81_al, The signal is
used to modulate a carrier_ which is transmitted to a remote destination
over a radio or cable ccaununications lines
At the re_ote terminal, demodulation reconstructs the video signal,
which is use dot modulate the density of print produced by a printing
device. This device is scaD.ning in a raster scan synch_onised with that at
the transmitting terminal_ A_ a res_It, a facs!mile copy of the subject
document is produced.
Probably you have uses for this facility in you_ organisation.
Y_rs Sincerely,
P.J. CROSS
Group Leader - Facsimile Research
Regislered hi I'mgla.fl: No. 2038
R_.glst ered Om¢c: 6{) Vicarg I,a.e, Ilfl)rd_ |_ ssex.
Specifications and regulatory information 55
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