Sujet Mastering a -0.3 db ? pourquoi
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The Jos
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Est-ce que quelqu'un serait m'expliquer clairement pourquoi il est recommendé de mastérisé avec une limitation à -.03 db?
J'ai cru comprendre en lisant les aides du l'ultramaximiser de wave que ct pour prévenir certaines erreur lors d'un oprération de changement de résolution. (re-sampling)
Mais quand je bouced par exemple un master de 24 a 16 je ne constate pas d'erreur et tout le signal est bien callé a la valeur que j'ai limité.
Je vous copie colle l'aide de wave si quelques douté en anglais pour me faire un résumé
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Citation : Bearing in mind what’s just been said, it might seem logical to keep the signal
peaking a few dB below digital zero until all processing has been carried out.
After that, you can safely normalize the signal–or can you?
A related problem with peak clipping can arise when a normalized soundfile or
signal is converted to a new sampling rate. The reason has to do with the
sample-rate conversion process itself, and during sample rate reduction,
the signal is effectively being filtered; the available audio frequency range is
smaller at lower sampling rates. Such filtering can increase peak sound levels
in exactly the same way as attenuating equalizers can. But even when
increasing sampling rate, an increase of peak level can occur. This is because
the continuous-time audio waveform is represented in the digital domain only
by its values at the sampling instants. It is perfectly possible for the peak
value of the continuous-time audio waveform to occur at instants lying
between two sampling instants, and thus to be higher than the peak value at
any of the sampling instants. When changing the sampling rate, new sampling
instants are chosen for the continuous-time audio waveform, and these new
sampling instants may coincide with an increased peak lying between the
original sampling instants. This is especially likely to occur with signals with a
lot of high frequencies, since such signal waveforms change more rapidly
between the sampling instants.
Though artificially contrived signals can be created to really show up this
problem, in real life an attenuation of at least 0.3 dB or so prior to conversion
should provide adequate protection against clipping. You might expect
sample-rate-converter designers to account for the possibility by designing in
a small amount of attenuation, and the cheap ones generally do not.
But can you safely normalize a file that you know is at the final sample rate?
Unfortunately not, because many compact disc players (and some other
digital consumer equipment) use over-sampling digital-to-analog converters
(DACs) to produce the analog signal fed to the amplifier. Such over-sampling
converters involve a sampling rate conversion process which can (and does!)
cause audible peak clipping. Once again, some designers appear to have
overlooked this problem, although not as widely as they did in earlier DAC
designs.
Merci pour votre aide précieuse
~ Raziel ~
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"Mon âme brûlait paisiblement"
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Payload
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Peut etre est ce aussi une histoire de norme (red book je crois) des CD audios...
bon c'est pas trés franc comme intervention mais j'avais lu ca...
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Rantanplan
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Moe_fr
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Mister H-Pi
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![The Jos The Jos](https://static.audiofanzine.com/img/user/avatars/stage.png?w=40&h=40&fm=pjpg&s=82e12a88c09fcbee576457d6ec57e82a)
The Jos
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~ Raziel ~
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o==]::::::::::::::>
---------------
"Mon âme brûlait paisiblement"
---------------
http://www.maldoror-web.com
![Moe_fr Moe_fr](https://static.audiofanzine.com/img/user/avatars/generic.png?w=40&h=40&fm=pjpg&s=0d6213e9da38ef4cab8d0bdd3999c731)
Moe_fr
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![The Jos The Jos](https://static.audiofanzine.com/img/user/avatars/stage.png?w=40&h=40&fm=pjpg&s=82e12a88c09fcbee576457d6ec57e82a)
The Jos
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Citation : J'ai remarqué qu'effectivement un grand nombre de CD's atteignaient les 0dB... Mais c'est la mode du "tape dans l'rouge" en ce moment...
J'en ai meme vu et c pas rare non plus qui carrement clippe et font des plat a 0db vérifier sous sound forge. Mias on dirait qu'il ont l'art et s'autorise de faires de plats propre, c a dire qui ne s'entendent pas ...
~ Raziel ~
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o==]::::::::::::::>
---------------
"Mon âme brûlait paisiblement"
---------------
http://www.maldoror-web.com
![Moe_fr Moe_fr](https://static.audiofanzine.com/img/user/avatars/generic.png?w=40&h=40&fm=pjpg&s=0d6213e9da38ef4cab8d0bdd3999c731)
Moe_fr
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En définitive, on peut dire que mastériser à -0.3dB est une réserve.
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Warpboy
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et j essaie un minimum de realiser des enchainements entre morceaux ...et les niveaux des ziks sur cd sont tres hauts, suffit d ouvrir cool edit wavelab ou autre et tu n as pa une zik avec des variations de niveau nombreuses fluides...mais plutot une ligne droite ..hormis pdt le debut et la fin du morceau...a peu pres 30-45 sec sur 5-6min!!
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