Mangakanani amandla esandisi-lizwi endiwadingayo?

"Masifune amandla angakanani isikhulisa-mandla?"  Abantu abaninzi bacinga ukuba inkulu ingcono. Kodwa eneneni kukho iingcamango ezininzi. Kwelinye icala, ii-amplifiers ezinamandla amakhulu, zibiza kakhulu kwaye zisebenzisa amandla amaninzi; okwesibini, ngaba ufuna ngenene iamplifier yamandla aphezulu? Ngaba amandla amaninzi athetha umgangatho ongcono wesandi?

Izinto ezibandakanyekayo ziquka indawo yokuphulaphula, umgama phakathi kwesithethi kunye nomphulaphuli, ukusebenza kakuhle kwesithethi, kunye namandla anokumelana nawo, njl., Okuya kuchaphazela iimfuno zamandla zenkqubo yomsindo kwi-amplifier yamandla.

Ngoku, sichaza ubukhulu becala "ukusebenza kakuhle kwesithethi'', luxinzelelo lwesandi olufunyenwe ngokufaka isiginali ye-1W kumgama wemitha eyi-1 ukusuka phambi kwesithethi, eyi-axis yesandi. 

Ukusebenza kakuhle kwesithethi ngasinye kwahlukile 

Ngokuqhelekileyo, ukusebenza kakuhle kwesithethi kuqhelekileyo kuluhlu lwe-82-88dB / w / m (dB = decibel). Ukuba ukusebenza kakuhle kwegama ngama-86dB/w/m njengomzekelo, oko kuthetha ukuba isithethi sikumgama wemitha e-1 ukusuka kumgca we-axis wesandi (oko kukuthi, ngqo phambi kwebhaffle yangaphambili yesithethi), kwaye uxinzelelo lwesandi luya kuba. 86dB xa i-1W (watt) isignali ifakiwe 

Nangona kunjalo, uxinzelelo lwesandi luhambelana ngokungafaniyo kwisikwere somgama ovela kumthombo wesandi, ngoko ke ukuba umgama wokumamela ngokubanzi uqikelelwa kwiimitha ezi-2, isithethi esifanayo siya kuba ne-80dB yoxinzelelo lwesandi xa amandla okufaka i-1W (i-algorithm ye I-dB iphindwe kabini rhoqo nge-3dB, kwaye umgama uphindwe kabini. I-1/4 yoxinzelelo lwesandi ngu-6dB).

Ke ukuze sikwazi ukufezekisa uxinzelelo lwesandi olusisiseko malunga ne-90dB yokuphulaphula ngokubanzi, sifuna malunga ne-8W yamandla ukuze sibe noxinzelelo lwesandi lwe-89dB. Ke ngoko, ukuba ukusebenza kwesithethi akukho phantsi kakhulu, ngokuqhelekileyo, i-amplifier yamandla ye-10W inokumamela umculo ngokuqhelekileyo ngaphandle kwengxaki.