Posted by NRen2k5 on 07/11/06 15:50

Laurence Payne wrote:
> On Mon, 10 Jul 2006 13:19:24 -0400, NRen2k5 <nomore@email.com> wrote:
>
>>>> Unfortunately that volume reduction is probably achieved digitally by
>>>> just throwing away bits, which is a bad thing.
>> It doesn't throw away bits. What it does is it changes "global gain"
>> values. Doing so is totally lossless and reversible.
>
> But, while it is happening, the system is throwing away bits.

No.

>>> Anyway do you WANT
>>>> everything reduced to the level of the quietest? You then have to
>>>> apply more amplification, bringing noise levels up.
>> So?
>
> You don't see that as undesirable?

The noise levels on modern MP3 players are, what, -86dB? Who gives a hoot?

>> And you don't have to reduce them to the level of the quietest. What you
>> can do is apply "track gain" so that all the songs are a certain volume,
>> for example 89dB, and then use "constant gain" to bring the volume of
>> every song up or down by the same amount.
>>
>>> I had a look, and I can't see how the device works without modifying
>>> dynamic range - but even if it works by lowering... you have another
>>> valid 'yuk' point.
>> MP3Gain doesn't touch dynamic range.
>
> Of course it does. The noise floor of the playback system isn't going
> to go away. Reducing signal level will bring peaks nearer to the
> noise floor, i.e. reduce dynamic range.

Dynamic range is the difference between the lowest and highest signal
levels, not the highest signal level and the floor. MP3Gain adjusts the
level of the whole song by the same amount, so dynamic range is unchanged.

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