Kusiyanitsa pakati pa Mapeto ndi Ma Watts
Decibels (phokoso lakumveka) ndi watts (mphamvu ya amplifier mphamvu) ndizofala zomwe zimagwiritsidwa ntchito pofotokoza zipangizo zamamvetsera. Zingakhale zosokoneza, ndiye apa pali kufotokozera kosavuta kwa zomwe iwo akutanthauza ndi momwe amachitira.
Kodi Decibel Ndi Chiyani?
A decibel amapangidwa ndi mau awiri, deci, kutanthauza gawo limodzi la magawo khumi, ndi bel, yomwe ndi dzina lotchedwa Alexander Graham Bell, yemwe anayambitsa telefoni.
Mimba ndi gawo limodzi la phokoso ndi decibel (dB) ndilo limodzi la magawo khumi la bel. Khutu laumunthu limamvetsetsa maulendo osiyanasiyana a mawu ochokera ku 0 decibels, omwe amakhala chete kumapeto kwa khutu la munthu, mpaka ma decibel 130, omwe amachititsa ululu. Mtengo wa 140 dB ukhoza kuyambitsa kuwonongeka kwa kumva ngati kupirira kwa nthawi yaitali pamene 150 dB ikhoza kuphulika, ndipo nthawi yomweyo kuwononga kumva kwanu. Kumveka pamwamba pa msinkhu uwu kungakhale kovulaza kwambiri mwinanso kupha.
Zitsanzo zina za mawonekedwe ndi ma decibels awo:
- Kupuma kwa munthu kumveka kuchokera pafupi ndi pafupi 10 dB
- Kukambirana koyenera ndi pafupifupi 60 dB
- Chotsuka choyeretsa nthawi zambiri pafupifupi 80dB
- Jet injini yoyandikana ndi pafupifupi 120 dB (ndicho chifukwa chake mumawona ogwira ntchito pamphepete mwa bwalo la ndege akuvala earmuffs zoteteza)
- Siliva ya ambulansi imakhala pafupi 120 dB pafupi
Khutu laumunthu limatha kumva ndi kuzindikira kuwonjezeka kapena kuchepetsedwa mu msinkhu wa mawu ofanana ndi 1 dB. Chinthu chochepa kuposa +/- 1 dB ndi chovuta kuchizindikira. Kuwonjezeka kwa 10 dB kumawoneka ngati pafupifupi kawiri mokweza ndi anthu ambiri.
Kodi Watt Ndi Chiyani?
Watt (W) ndi gawo la mphamvu, monga mahatchi kapena joules, otchedwa James Watt, katswiri wa ku Scottish, katswiri wamagetsi, ndi wopanga zinthu.
Mu audio, watt ndiyeso ya mphamvu yotulutsidwa ndi wolandila kapena amplifizi yogwiritsira ntchito volopakita. Olankhulana amawerengedwa chifukwa cha chiwerengero cha Watts chimene angachigwire. Pogwiritsira ntchito amplifier yomwe imapanga ma watt aakulu kuposa wokamba nkhaniyo amatha kuphulika, motero kuvulaza, wokamba nkhaniyo. (Poyang'ana oyankhula, muyenera kumvetsetsa kuyankhula kwa wokamba nkhani .)
Mgwirizano pakati pa magulu a magetsi opangidwa ndi magetsi ndi olankhula ma voliyumu si osiyana; Mwachitsanzo, kuwonjezeka kwa Watts 10 sikukutanthauzira kuwonjezeka kwa dB 10.
Ngati mukufanizira voliyumu ya 50 Watt amplifier ndi 100-Watt amplifier, kusiyana ndi 3 dB okha, zochepa kuposa mphamvu ya khutu laumunthu kumva kusiyana. Zingatenge mphamvu yamagetsi ndi mphamvu khumi (500 Watts!) Kuti iwonedwe ngati mofuula mobwerezabwereza-kuwonjezeka kwa 10 dB.
Kumbukirani izi pamene mukugula amplifier kapena wolandila:
- Kukayikira mphamvu yotulutsa mphamvu (watts) kudzatulutsa kuwonjezereka kwa 3 dB mokweza.
- Kuwonjezeka katatu kwa mphamvu yotulutsa mphamvu kudzachititsa kuwonjezereka kwa dB 10, kapena phokoso lachiwiri.