Anh
noise
noise factor
noise ratio
Đức
Ballast
Stoerrate
Ballastquote
Störfaktor
Pháp
taux de bruit
taux de bruit /IT-TECH/
[DE] Ballast; Stoerrate
[EN] noise
[FR] taux de bruit
[DE] Ballastquote; Störfaktor
[EN] noise factor; noise ratio