richrd daul ne 1950 mein british medical journal mein anusandhaan prakaashit kiya jismein dhoomrapaan aur fefade ke Cancer ke beech kareebi sambandh pradarshit kiya gaya.[35] chaar saal baad 1954 mein british doctoron ke adhyayan mein, jise 20 varshon tak lagbhag 40 hajaar doctoron ne kiya tha, is sujhaav ki pushti ki, jiske aadhaar par sarkaar ne salaah jaari ki ki dhoomrapaan aur fefade ke Cancer ki dar ka aapasi sambandh hai.[5] isi tarah 1964 mein dhoomrapaan aur svaasthya par sanyukt raajya America ke surgeon general ki report dhoomrapaan aur Cancer ke beech sambandh par sujhaav se shuroo hui.
jab se digital sarkit enaalaug ghatakon se bana hain digital sarkit lo-prisishn se bhi dheere ganana karta hai jo ek samaan space aur shakti ka prayog karta hai. haalaanki digital sarkit iske uchch shor unmukti ke kaaran baar-baar aakalan kar paaega. doosari or, uchch parishuddhata domen mein (udaaharan ke liye jahaan parishuddhata ke liye 14 ya adhik bits ki aavashyakta hai) enaalaug sarkit ko adhik shakti aur digital samakaksh kshetr ki aavashyakta hai.
prativedan ke liye engineer digital system ke prakaaron par vichaar karte hain. adhikaansh digital system "sanyojan system" aur "anukramik system" mein vibhaajit ho jaate hain. sanyojan pranaali mein hamesha jo input diya jaata hai vahi aautaput vah deta hai. yeh mool roop se laujik prakriya ke set ka pratinidhitv karta hai aur jiski charcha pehle hi ki ja chuki hai.

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