[Alsaplayer-devel] Logarithmic volume scale.

[MadeJ]

On 12/16/08 02:11, David Fellows wrote:
> On Tue, 16 Dec 2008 01:14:30 +0100
> "=?ISO-8859-2?Q?Adam_Kuklasi=F1ski?=" wrote -
>    
>> Hi,
>> I'm using Alsaplayer since few days. I like it a lot, but I've noticed
>> two drawbacks.
>>
>> The volume slide apparently attenuates the signal linearly instead of
>> logarithmically. I mean, from what I can hear, the way it affects the
>> signal is something like:
>>
>> Sout(t) =3D Sin(t) * X
>>
>> where Sin(t) and Sout(t) are original signal and the attenuated signal
>> respectively, X being the position of the volume slide in percents.
>> > From what I know about the nature of human hearing this formula should
>> look like that:
>>
>> Sout(t) =3D Sin(t) * { 10 ^ [ ( 1 - X ) * 75 / 20 ] }
>>
>> Thanks to this "75 / 20" factor, the attenuation done by the
>> attenuator is between -75dB and 0dB. This means that in the "loudest"
>> position it does nothing to the signal (0db) and in it's minimum it
>> lowers the sound level by 75 dB (the magnitude is then ca. 5600 times
>> lower). The -75dB - 0dB range could and can be changed, but is quite
>> optimal. 75dB attenuation causes that very loud sounds, say 90dB, are
>> after attenuating only 15dB which is barely audible in normal
>> conditions.
>> This little change would greatly improve the "feeling" of the volume
>> slide. Notice, that there is only small (subjective) difference
>> between 100% and 50%, and there is huge difference between 50% and 20%
>> in loudness of played music now. With formula above, this subjective
>> change of loudness will be spread evenly across the whole range of the
>> slide.
>>      
>
> I would second Adam's suggestion.
>
> Dave F
>
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>    
unfortunately it seems something happened to dominique (admin) and 
project is not maintained anymore
some time ago (long time ago) i sent him patches with quite a few bug 
fixes and new features (eg. status icon)
he didn't respond at all
so i can easily say this project is dead now (or at least needs new admin)