[vdr] Low volume on Pro7 ?

Rainer Zocholl UseNet-Posting-Nospam-74308- at zocki.toppoint.de
Sat Jun 11 12:00:00 CEST 2005

hm at seneca.muc.de(Harald Milz)  10.06.05 22:24

Once upon a time "Harald Milz " shaped the electrons to say...

>Dr. Werner Fink <werner at suse.de> wrote:
>> Most AC3 channels do have a lower volume due to the fact that
>> the dynanic range of AC3 is much more than 100dB. This is much
>> more than you can do with Mpeg Audio and raw PCM at 16bit[1].

>Hmmm - I'm missing the logic here. If the average level of an AC3
>channel is below the other (PCM) channels, I turn the receiver up
>anyway. The next explosion - well, you get the idea.

The trick must be not to increase the volume of ac3 but to reduce
the volume of other channels.

Or -better- to insert a dynamic volume control (AVL audio/automatic 
volume limiter) because very few people will like to have 140dB(A) comimg 
from the TV... (if minimum environmetal "base" noise is assumed to be 40dB(A)),
that would avoid the distortion you will of course get at the next explosion. 

What's the sense of 100dB dyn. range?
1. Marketing, bigger number looks better (see PPMO)
2. Marketing, you have to buy better Amplifiers (I assume 4000W RMS 
   output would be sufficient)
3. Marketing, bigger amp requires bigger loudspeaker
4. Marketing, bigger amp reuires bigger rooms
5. Marketing, you have to buy preamp that would be able to
   limit the peeks to protect your ears and increase the minimum above 
   the environmental noises.

We already had this disussion with "CD" and the "giant" 90dB 
they claimed to give.
But you will hardly find any popular music which has not a reduced
dynamic range. If it is 65dB it'll be good and better for your ears
and equipment.


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