Umehluko Phakathi kwama-Decibels nama-Watts
I-Decibels (isilinganiso sokuzwakalayo) kanye ne-watts (isilinganiso samandla wokukhulisa) yimiqondo evamile esetshenziswa lapho ichaza imishini yomsindo. Bangase badideke, ngakho-ke nansi incazelo elula yalokho abakushoyo nokuthi bahlobene kanjani.
Iyini i-Decibel?
I- decibel yenziwe ngamagama amabili, i- deci, okusho okuyishumi, nesel, okuyinto ebizwa ngokuthi u-Alexander Graham Bell, umsunguli wefoni.
Ibhande liyingxenye yomsindo kanye ne-decibel (dB) yinye yeshumi yebhande. Indlebe yomuntu izwela emazingeni ahlukahlukene aphikisayo avela ku-0 decibels, okuyi-silence ephelele endlebeni yomuntu, kuma-decibel ayi-130, okubangela ubuhlungu. Umthamo we-140 dB ungabangela umonakalo wokuzwa uma ukhuthazwe isikhathi eside ngenkathi uhlangabezana no-150 dB ungaqeda ama-eardrum akho, ngokushesha ukulimaza umuzwa wakho wokuzwa. Umsindo ngaphezu kwalesi zinga kungalimaza kakhulu futhi kubulawe.
Ezinye izibonelo zemisindo nama-decibelthi awo:
- Ukuphefumula komuntu wezwa kusuka kude kungaba ngu-10 dB
- Ingxoxo evamile ingaba ngu-60 dB
- I-vacuum cleaner ivame ukuzungeze i-80dB
- I-jet injini eseduzane cishe ingaba ngu-120 dB (yingakho ubona izisebenzi eziphezu kwezindiza ezigqoka izinsimbi zokuzivikela)
- I-ambulance siren iphinde ibe ngu-120 dB eseduze
Indlebe yomuntu iyakwazi ukuzwa futhi ibone ukwanda noma ukwehla ezingeni elizwakalayo elilingana no-1 dB. Noma yini engaphansi kuka-+/- 1 dB kunzima ukuyiqonda. Ukwanda kwe-10 dB kubonakala njengokungathi kabili ngokuzwakalayo ngabantu abaningi.
Kuyini i-Watt?
I-Watt (W) iyinithi yamandla, njengamahhashi noma ama-joules, okuthiwa nguJacob Watt, onjiniyela waseScotland, omakhemikhali, nomsunguli.
Ngomsindo, i-watt iyinani lesikhiqizo samandla somamukeli noma amplifier esetshenziselwa amandla i-loudspeaker. Abakhulumi balinganiselwe ngenani le-Watts abangayisingatha. Ukusebenzisa i-amplifier eyenza ama-watts amakhulu kunokuba isikhulumi silinganiswe ukusingatha singaphuma, ngakho-ke kulimaza, isikhulumi. (Uma ubheka izikhulumi, kufanele ucabangele ukuzwa kwesikhulumi nesipikha .)
Ubuhlobo phakathi kwamayunithi wamandla okukhipha kanye namapulangwe wesipikha wevolumu akulona oluhambisanayo; isibonelo, ukwanda kwama-watts angu-10 akuhumushi ku-10 dB ukwanda kwevolumu.
Uma uqhathanisa ivolumu ephezulu ye-amplifier engu-50-watt ene-amplifier engu-100-watt, umehluko u-3 dB kuphela, awuncane kakhulu kunekhono lezindlebe zomuntu ukuzwa umehluko. Kungathatha i- amplifier ngamandla angu-10 ngaphezulu (ama-watts angu-500!) Okumele kubonwe njengesibili ngokuzwakalayo-ukwanda kwe-10 dB.
Gcina lokhu engqondweni uma uthenga i-amplifier noma i-receiver:
- Ukungabaza amandla okukhipha amandla (watts) kuzoholela ekukhuphukeni okungu-3 dB ngokuphakama okukhulu.
- Ukukhuphuka izikhathi eziyishumi kuze kube khona ukukhishwa kwamandla kuzoholela ekukhuphukeni kwe-10 dB, noma umsindo ophindwe kabili ngokuzwakalayo.