Ungase uhlangabezane nesichazwe somkhiqizo olufakwe ohlwini, noma mhlawumbe uzwile noma ufunde ingxoxo mayelana nesilinganiso sesignali kuya kumsindo. Ngokuvamile kufingqiwe njenge-SNR noma i-S / N, lokhu kuchazwa kungabonakala ku-cryptic kumthengi ojwayelekile. Ngenkathi izibalo ngemuva kwesilinganiso sesignali kuya kumsindo, umqondo awukho, futhi le nzuzo ingathinta izinga lomsindo jikelele lomshini.
Ukulinganisa Okumangalisa Kumsindo
Isilinganiso sesignali kuya komsindo siqhathanisa izinga lamandla wesignali kumandla emsindo. Ivame ukuboniswa njengendlela yokulinganisa ama-decibel (dB) . Izinombolo eziphakeme kakhulu kusho ukucaciswa okungcono, ngoba kunolwazi oluwusizo (isignali) kunedatha engadingeki (umsindo).
Isibonelo, uma ingxenye yomsindo ibala isilinganiso sesignali kuya kumsindo we-100 dB, kusho ukuthi izinga lesignali yomsindo liphezulu kune-100 dB kunezinga lomsindo. Ukucaciswa kwenani le-signal-to-noise lika-100 dB lihle kakhulu kuneli-70 dB (noma ngaphansi).
Ngomfanekiso, asho ukuthi uxoxisana nomuntu ekhishini okwenzekayo nokuba nesifriji esikhulu kakhulu. Ake sithi isiqandisini sikhiqiza ama-50 dB we-hum (cabanga lokhu njengomsindo) njengoba igcina okuqukethwe kwayo kupholile-ifriji enkulu. Uma umuntu okhuluma naye ekhetha ukuxoxa naye ngokumangalisa (cabanga lokhu njengesignali) ku-30 dB, ngeke ukwazi ukuzwa igama elilodwa ngoba liphethwe yi-cool friji! Ngakho-ke, ucela lo muntu ukuthi akhulume kakhulu, kodwa ngisho naku-60 dB, kungenzeka usabacela ukuba baphinde babuyele izinto. Ukukhuluma nge-90 dB kungase kubonakale kufana nomdlalo wokumemeza, kodwa okungenani amagama azozwakala ngokucacile futhi aqondwe. Lona ngumqondo ngemuva kwesilinganiso sesignali kuya kumsindo.
Kungani Ukulinganisa Ukumangalisa Okubalulekile Kuyadingeka
Ukucaciswa kokulinganisela komsindo kumsindo kungatholakala emikhiqizweni eminingi nasezingxenyeni ezibhekene nomsindo njengezikhulumi, izingcingo (wireless noma enye), ama-headphone, ama-microphone, ama-amplifiers , amamukeli, ama-turntables, ama-radios, ama-CD / ama-DVD / abezindaba, Amakhadi womsindo we-PC, ama-smartphone, amaphilisi, nokuningi. Nokho, akubona bonke abakhiqizi abenza lokhu kukwazi kalula.
Umsindo wangempela uvame ukubonakala njengemhlophe noma i-electronics noma i-static, noma i-hum ephansi noma idlidliza. Gweba ivolumu yezikhulumi zakho yonke indlela ngenkathi kungekho lutho oludlala-uma uzwa i-hers, leyo yomsindo, ovame ukubizwa ngokuthi "isitezi somsindo." Njengesiqandisisi esimweni esichazwe ngaphambilini, le ndawo yomsindo ihlale ikhona.
Uma nje isignali engenayo inamandla futhi ingaphezu kwenhla yomsindo, umsindo uzokwazi ukugcina ikhwalithi ephakeme. Yilokho uhlobo lwezinga elihle lokubonisa isignali abantu abakhetha umsindo ocacile nolungile.
Kodwa uma isignali ibonakala ibuthakathaka, abanye bangase bacabange nje ukukhulisa ivolumu ukuze kukhuliswe umkhiqizo. Ngeshwa, ukulungisa ivolumu phezulu nakwehla kuyathinta kokubili umsindo womsindo kanye nesignali. Umculo ungase uphakamise kakhulu, kodwa kanjalo nomsindo ongaphansi. Kumele ukhulise kuphela amandla wesignali womthombo ukuze ufeze umphumela oyifunayo. Amanye amadivayisi afaka i-hardware kanye / noma izakhi ze-software ezenzelwe ukuthuthukisa isilinganiso sesignali kuya kumsindo.
Ngeshwa, zonke izingxenye, ngisho nezintambo, engeza ezinye zezinga lomsindo kwisignali yomsindo. Yizo ezingcono ezenzelwe ukugcina phansi umsindo njengokuncintisana ukuze kukhuliswe isilinganiso. Amadivayisi we-Analog, njengama-amplifiers kanye nama-turntable, ngokuvamile anezinga eliphansi lesignali nomsindo kunezidivayisi zedijithali.
Kuyafaneleka nakanjani ukugwema imikhiqizo enezilinganiso ezibi kakhulu zesignali kuya kumsindo. Noma kunjalo, isilinganiso sesignali kuya kumsindo akufanele sisetshenziswe njengenkcazelo eyodwa kuphela yokukala ikhwalithi yomsindo yezingxenye. Ukuphendula ngokuphindaphindiwe nokuhlanekezela kwe-harmonic kufanele kucatshangelwe.