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