Ogwiritsa ntchito ochulukirachulukira ayamba kugwiritsa ntchito mafoni amtundu wa digito, koma m'malo ena osatukuka mafoni amtundu wa analogi amagwiritsidwabe ntchito.Ogwiritsa ntchito ambiri amasokoneza ma sign a analogi ndi ma digito.Ndiye foni ya analogi ndi chiyani?Kodi foni ya digito ndi chiyani?
Foni ya analogi - Foni yomwe imatumiza mawu kudzera mu siginecha ya analogi.Magetsi analogi chizindikiro makamaka amatanthauza matalikidwe ndi lolingana mosalekeza magetsi chizindikiro, chizindikiro ichi akhoza analogi dera ntchito zosiyanasiyana, kuwonjezera, kuwonjezera, kuchulukitsa ndi zina zotero.Zizindikiro za analogi zimapezeka paliponse m'chilengedwe, monga kusintha kwa kutentha kwa tsiku ndi tsiku.
Chizindikiro cha digito ndi chiwonetsero cha digito cha chizindikiro cha nthawi (choyimiridwa ndi kutsatizana kwa 1 ndi 0), nthawi zambiri chimachokera ku chizindikiro cha analogi.
Ubwino ndi kuipa kwa ma sign a digito:
1, khalani ndi gulu lafupipafupi.Chifukwa mzerewu umatumiza chizindikiro cha pulse, kutumiza kwa chidziwitso cha mawu a digito kumafunika kuwerengera 20K-64kHz bandwidth, ndipo njira ya mawu a analogi imangotenga 4kHz bandwidth, ndiko kuti, chizindikiro cha PCM chimapanga njira zingapo za mawu a analogi.Kwa njira inayake, kuchuluka kwa kagwiritsidwe ntchito kake kumachepetsedwa, kapena zofunikira zake pamzere zimachulukitsidwa.
2, zofunika luso ndi zovuta, makamaka kalunzanitsidwe luso amafuna mkulu mwatsatanetsatane.Kuti mumvetse bwino tanthauzo la wotumiza, wolandirayo ayenera kusiyanitsa molondola chinthu chilichonse, ndikupeza chiyambi cha gulu lililonse lazidziwitso, zomwe zimafuna kuti wotumiza ndi wolandira azindikire kugwirizanitsa, ngati mapangidwe a digito, vuto la kulunzanitsa lidzatha. kukhala kovuta kwambiri kuthetsa.
3, kutembenuka kwa analogi / digito kudzabweretsa cholakwika cha quantization.Pogwiritsa ntchito mabwalo akuluakulu ophatikizika komanso kutchuka kwa njira zotumizira mauthenga a Broadband monga optical fiber, zizindikiro zowonjezereka za digito zimagwiritsidwa ntchito posungira komanso kutumiza mauthenga, kotero zizindikiro za analogi ziyenera kusinthidwa kukhala analog / digito, ndipo zolakwika za quantization zidzatha. zimachitika pakutembenuka.
Nthawi yotumiza: Feb-05-2024
