Umehluko phakathi kwama-Decibels kunye nama-Watts
I-Decibels (umlinganiselo wezwi elikhulu) kunye ne-Watts (umlinganiselo wamandla amplifier) yimiqathango eqhelekileyo esetyenziswayo xa ichaza izixhobo zomsindo. Basenokudideka, ngoko nantsi inkcazo elula yento athetha ngayo kunye nendlela abadibana ngayo.
Yintoni i-Decibel?
I- decibel yenziwe ngamagama amabini, i- deci, ithetha enye yeshumi kunye ne- bel, yileyunithi ebizwa ngokuba ngu-Alexander Graham Bell, umseli wefowuni.
I- bel isunithi yesandi kunye ne-decibel (dB) enye yeshumi yeb bel. Indlebe yomntu iyanqabana kwiinkalo eziphakamileyo zamanqanaba avela kwi-0 decibels, eline-silence epheleleyo kwindlebe yomuntu, ukuya kuma-decibel ayi-130, obangela intlungu. Umthamo we-140 dB ungabangela umonakalo wokuphulaphula xa unyamezela ixesha elide ngelixa ufumana i-150 dB inokutshabalalisa i-eardrums, kwaye ngokukhawuleza ukulimaza umva wakho wokuva. Isandi ngaphaya kweli nqanaba sinokulimaza kakhulu kwaye sibulale.
Ezinye imizekelo yezandi kunye ne-decibel yazo:
- Ukuphefumla komuntu ukuva kumgama osondeleyo malunga ne-10 dB
- Ingxoxo evamile i malunga ne-60 dB
- I-vacuum cleaner idla ngo-80dB
- I-injini ye-jet kwi-intanethi esondeleyo malunga ne-120 dB (ke kutheni ubona abasebenzi kwi-alarmon yesiqithi-moya egqoke iindlebe zokukhusela)
- I-ambulance siren iphinde ibe malunga ne-120 dB kufuphi
Indlebe yomntu inakho ukuva kunye nokuqonda ukwanda okanye ukuncipha kwizinga lezandi elilingana ne-1 dB. Into engaphantsi kwe +/- 1 dB kunzima ukuyiqonda. Ukwanda kwe-10 dB kubonwa ngathi phantse kabini ngelizwi ngabantu abaninzi.
Yintoni iWatt?
I-Watt (W) iyunithi yamandla, njengamahhashi okanye i-joules, ebizwa ngokuba nguJames Watt, unjiniyela waseScotland, isazi samakhemikhali kunye nomqambi.
Kwi-audio, i-watt ingumlinganiselo wesiphumo sombane we-receiver okanye amplifier esetyenziselwa ukulawula i-loudspeaker. Abathengi balinganiswa ngenani labama Watts abanokusingatha. Ukusebenzisa i-amplifier evelisa ama-watts amakhulu kunokuba isithethi ilinganiswe ukusingatha, ingaba yonakalisa, isithethi. (Xa ukhangela izithethi, kufuneka uthabathe inzululwazi yesikhulumi .)
Ubudlelwane phakathi kweeyunithi zeziphumo zamandla kunye nezunithi zesithethi zevolumu alukho mgca; umzekelo, ukwanda kwama-Watts ayi-10 akuguquleli kwi-10 dB yokwanda kwindleko.
Ukuba uthelekisa umthamo omkhulu we-amplifier engu-50-watt ene-100-watt amplifier, umlinganiselo ngowama-3dB kuphela, awona mkhulu kunokuba nekhono lomntu ukuva umahluko. Kuza kuthatha i- amplifier ngamaxesha angaphezu kwama-10 angaphezulu kwamandla (500 watts!) Ukuba ibonwe njengesihlandlo kabini-ukunyuka kwe-10 dB.
Gcina oku engqondweni xa uthengisa umkhulisi okanye umkeli:
- Ukutshitshiswa kwempembelelo yamandla (watts) kuya kubangela ukunyuka kwe-3 dB ngokuvakalayo.
- Ukunyuka kwamaxesha amathandathu ukuya kutsho umbane oza kubangela ukunyuka kwe-10 dB, okanye isandi esiphakamileyo kabini.