[pkg-mad-maintainers] Bug#465438: Bug#465438: Bug#465438: terrible decoding quality with libmad0 on amd64

[Kurt Roeckx]

On Wed, Feb 13, 2008 at 12:16:30AM +0100, Julien Pommier wrote:
>>
>> There seems to be some 10 KHz signal, but it's like -75 dB.  I doubt 
>> you
>> can hear that, since the rest seems to be around -10 dB.  I can't hear 
>> it.
>>
>
> You are right I just checked with different headphones, and I don't hear 
> it with those -- only my sony mdr-7506 do reproduce the artefact, and 
> trust me, with them it does not sound like a -60dB noise ! (those 
> headphones are very very sensitive to high frequencies)
>
> For people who may want to check if they hear the difference, I have put 
> two wav files here
> http://gruntthepeon.free.fr/test/m.wav
> and
> http://gruntthepeon.free.fr/test/m2.wav

I've also substracted those 2 files from each other and put the result
at: http://www.roeckx.be/test-diff.flac

It has a peak amplitude of -56.7 dB.  You really have to turn up the
volume to hear the peaks around 300 Hzi, 600 Hz and 10 KHz which are around
-65 - -70 dB.

With some luck you should hear those very good in your headphones.


Kurt