[PD] dbtorms amplitude scaling sounds wrong

[Roman Haefeli]

ciao

the [dbtorms] works quit correct afaik.
actually, +6dB means a doubling of the amplitude. at 48dB (in a scale
from 0 to 100dB) your signal has an amplitude of around 1/(2^6)=0.02,
wich is quite quiet.
on one hand we have a linear scale, where on the upper half happens
almost nothing, and in the lower half it is quit difficult to adjust the
volume precisely. on the other hand we have the logarithmic scale, where
it is difficult too to adjust the volume, because  the signal raises
quite much in a very small area.
i prefer using the 'square' scale, wich is something like a combination
of these two:

[inlet~]
|
|   [slider 0 -1 ]
|   |
|   [t f f]
|   |     |
|   [*   ]
|   |
[*~]
|
[outlet~]

i always use this in order to adjust volumes.

cheers
roman

----- Original Message -----
From: "Stefan Turner" <stefan_turner at yahoo.co.uk>
To: <pd-list at iem.at>
Sent: Monday, February 28, 2005 5:38 PM
Subject: [PD] dbtorms amplitude scaling sounds wrong


> Hi list,
>
> I'm using dbtorms for amplitude control as follows:
>
>  signal in  volume (0 to 100dB)
>          |  |
>          | [dbtorms]
>          |  |
>          | [$1 50<
>          |  |
>          | [line~]
>          | /
>         [*~]
>          |
>         [dac~]
>
> This is AFAIK the correct way to use it. The problem
> is, the amplitude scaling doesn't sound right to my
> ears. 100dB is the loudest and 0dB is silence all
> right, but 50dB is extremely quiet. I thought that dB
> in this case are supposed to represent 'loudness', so
> 50dB should sound half as loud as 100dB? To me
> 'halfway' seems to be somewhere between 80dB and 85dB.
> Is it my patch or my ears?
>
> Thanks
>
> Stefan Turner
>
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