• ### Volume Control (dB)

Hi everyone,
I was wandering if there is a way to amplify a signal by lets say 1dB. The way I control Volume is by [*~] from 0 to 1, but that does not tell us anything regarding dB.

Thanks

• Posts 15 | Views 12919
• @Spyros hi Spyros,

try [rmstodb]

• Hi Solipp,
Thank you very much for your answer, I will try to do that with [dbtorms] and then 1-the value cause as I see here it is normalized to 100dB.

• To be honest with you I don't understand this conversion. Please see below the screenshot. Does this mean that if I want to amplify a signal 20dB I add 0.0001, it doesn't make sense.
Thank you very much again

• well, db is an logarithmic unit, since our perception of volume is "logarithmic".. does that make sense?

• Yes I can understand that... but 20dB ->[dbtorms]->0.0001. If I use this value (0.0001) I don't get 20dB reduction or amplification on the signal.

• sorry i'm not a native english speaker, so i have some trouble to explain that but i'll try. db is always relative.. so with an dbfs scale you'll get full blast at 0 db, with dbtorms you get full amplitude at 100 db. 94 db would mean half of the amplitude -> *~ 0.5. 20 db is almost nothing, nonperceptible.

• Thank you so much for your answers. I can understand all that (I have a phd on acoustics), but for example a signal that is 0dB (electroacoustic signal) and I want to reduce that to -3dB, is that doable with a command? Just to give an example wave editors can do ->amplify->-1dB

• hm. if you do it like

[+ 100]
|
[dbtorms] ?

i'm not quite sure what you are heading for..

• I am trying to be able to amplify by lets say -20dB or +20dB the played sound file a.wav:

• @Spyros
As you know 3dB does not really mean anything..... dB being a relative scale only +3dB or -3dB has any meaning.......
David

• Thank you very much David! I am just curious to understand why you say dB does not mean anything.
If I have a file playing from my speakers and I have a sound level meter and I see 80dB and then I use a wave editor and I amplify it by -3dB then I will see on the meter 77dB.

• @Spyros ..........Sorry Spyros...... I meant inside the program.......
In the real world it is of course a true measurement relative to the power of the smallest discernible sound........ which I remember being a cricket at 100M? in a quiet environment.....
And please let us know whether the patch actually gives you the true response on your meter!
David

• Thank you very much for your answer. I will measure tomorrow and get back to you. Thank you again for everything!

• David just checked with my home speakers and it works perfectly fine! I will check more in depth tomorrow but I am sure that it will be fine.
Thank you very much

Posts 15 | Views 12919
Internal error.

Oops! Looks like something went wrong!