HP Fax 2140 AsampleofITU#1testchartreducedto60.5%, Sample of ITU #1 test chart reduced to 60.5%

AsampleofITU#1testchart(reducedto60.5%)

A sample of ITU #1 test chart (reduced to 60.5%)

®

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.

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