[Dev] [OT] dB

Łukasz Stelmach l.stelmach at samsung.com
Tue Oct 22 15:33:12 GMT 2013


It was <2013-10-22 wto 15:47>, when Jussi Laako wrote:
> On 22.10.2013 16:18, Łukasz Stelmach wrote:
>> The way I've been taught full-scale is something absolute. For example
>> you've got audio signal with 16 bits per sample and you can't have
>> anything louder than 0 dBFS. You can't have a sample above 65535.
>
> Yes, although with more frequently used normalized floating point
> representation 0 dBFS is natural +-1.0 level which of course is not
> anywhere near value range limits. For DSD, 0 dBFS is defined to be 50%
> modulation depth which you can of course exceed (SACD specifies max
> allowed +3.1 dBFS). Note that 50% modulation depth of course is
> fulfilled by number of different bit patterns!
>
> In general the reference point should be something absolute. In this
> case the reference point was "all installed packages".

I disagree ;-) Full-Scale is definitely "all packages available" so two
machines with the same distro are comparable.

-- 
Łukasz Stelmach
Samsung R&D Institute Poland
Samsung Electronics
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