hat
Anjeneral pale, nan jeni, dB ak dB se sèlman ant plis la oswa mwens, pa gen okenn miltiplikasyon ak divizyon. pi itilize se nan soustraksyon a: rediksyon dbm se aktyèlman de pouvwa divize dbm, se siyal pouvwa ak pouvwa bri divize siyal nan rapò bri (Snr). Pou egzanp: 30dBm - 0dBm = 1000mW / 1mW = 1000 = 30dB. dbm plis dbm se aktyèlman de pouvwa miltipliye, pa gen okenn reyèl siyifikasyon fizik.
eng
Generally speaking, in engineering, dB and dB is only between the plus or minus, there is no multiplication and division. The most used is the subtraction: dBm reduction is actually two power divided dBm, signal power and noise power is divided signal to noise ratio (SNR). For example: 30dBm - 0dBm = 1000mW/1mW = 1000 = 30dB. dBm plus dBm is actually two power multiplied, there is no real physical meaning.