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Why -3dB? (An alternate approach to explaining dBs) | 3db | 最新更新的华语音乐

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Why -3dB? (An alternate approach to explaining dBs) | 在这里聆听最好的新音乐

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Why -3dB? (An alternate approach to explaining dBs)

Why -3dB? (An alternate approach to explaining dBs)

有关主题的信息 3db

Why is there specifically a -3db point chosen for frequency response? Support Roger on Patreon: Why is the dB-definition …

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Why -3dB? (An alternate approach to explaining dBs)

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31 thoughts on “Why -3dB? (An alternate approach to explaining dBs) | 3db | 最新更新的华语音乐”

  1. Maybe not that important but the name Bell is with two l's (Alexander Graham Bell) so its a bit odd that the decibel is correctly written as decibel.

  2. I can't understand timeline 3:14, the derivation is wrong, because if you refer to the relationship between g and kg, 1kg=1000g, here the 1decibel=0.1bel, another ex. 1 decilitre= 0.1litre, so the relationship will be 1dB=0.1bel=0.1*log(10)(P1/P2)

  3. Demonstrate that the doubling of the transmission frequency or the distance between the transmitting and receiving antenna attenuates the received power by 6 dB. !!!!!!! we need a solution if possible from every one who sees it

  4. Hey Mr., do you ever watch your own videos? I bet you don't. Because on this particular video you seem to be writing something important under the graph and of course you write so far down the canvass thus no one can see it, and clearly you haven't noticed it, otherwise you would have corrected it. Am I wrong?

  5. Great video for any experimentalists and designers in electronics, optics, acoustics or else. Instructor clarifies the confusion around the terms dB, dBm, dBV….etc. you encounter on datasheets and elsewhere in your career. He has put this valuable summary clearly and understandably together that most textbooks only throw out here and there to confuse readers. Thank you for posting such useful videos !

  6. For the definition of power P=V^2/R, how do you know the R in the numerator and denominator are the same value and thereby can be canceled out?
    Also, how come when going from power ratio to voltage or current ratio, you always take factor of sqrt(2)? HOw does it working out mathematically?
    Thanks in advance!

  7. Das ist lustig. Ich habe deine Internetseite über die letzten Jahre (oder sogar Jahrzehnte?) immer wieder besucht (bzw. hat sie mir Google vorgeschlagen, wenn ich nach Informationen gesucht habe 😉 ) und jetzt habe ich dich hier zufällig auf Youtube gefunden. Zu einem Thema das ich prinzipiell schon verstanden habe, aber nach diesem Video vollkommen klar (und in meinem Hirn endlich geordnet 😉 ) ist. Danke sehr!

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