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1.Where can I learn more about Dolby Digital?
2. Can I put the Dolby or DTS Logo's on my DVD's?
3. How should I mix for Pro Logic II matrix encoding?
4. What's the difference between Dolby Pro Logic II and Dolby Digital? Aren't all
Dolby products the same?
5. What's lossy encoding?
6. The Levels of my Dolby Digital files aren't the same as the original audio.
7. Doesn't Dolby Digital or DTS turn my stereo audio into surround?
8. I'm not getting surround out of my SurCode Dolby Digital plug-in in Premiere
Pro.
9. Why won't my Dolby receiver play my SurCode DTS CD/DVD files?
10. When I play my DTS CD (or files)all I hear is noise.
11.
Can I use Dolby Digital with DVD-Audio?
12. Why can't I make a high resolution surround DVD-Video disk. Why do I need
DVD-Audio?
Where can I learn more about Dolby Digital?
1.
Please review the Dolby Digital guidelines document found in our info section here.
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Can I put the Dolby or DTS Logo's on my DVD's?
2.Only professional certified encoders like SurCode can output files that will get Dolby's approval to put their logo on your discs. The inexpensive consumer Dolby encoders that typically come included with inexpensive authoring software cannot. Please contact Dolby Labs to apply for a logo.
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How should I mix for Pro Logic II matrix encoding?
3.
Please find the following link for a Pro Logic II mixing whitepaper.
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What's the difference between Dolby Pro Logic II and Dolby Digital? Aren't all
Dolby products the same?
4.
Dolby Digital is a lossy data compression scheme. It must be decoded back into
audio. It is used for DVD-Video and closed systems (like cable TV with Dolby Digital
decoder boxes). It can't be used if there might not be a Dolby Digital decoder. It will then
play the AC-3 data noise, which if the stereo is turned up could blow the speakers! Pro
Logic II is a "Matrix" encoder that uses analog processes, like phase shift and filtering, to
"fold" the other channels into the left and right channels. Although not discrete like Dolby
Digital, it can be played on normal stereo systems. If there is a Pro Logic II decoder, it
will "unfold" the other channels back out of the stereo signal.
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What's lossy encoding?
5.
Lossy encoding is data compression used to shrink the file size and data rate of
audio files. It must "throw away" portions of the audio to shrink the file to an extremely
small size. This means the original audio quality is not fully maintained. Each company
who develops a lossy scheme has it's own way of determining what audio to keep and
what to "throw away". MP3 is probably the most common, used for internet transfer of
audio. Dolby Digital and DTS are lossy encoding codecs used in the DVD-Video format.
DVD-Audio does not accept any type of lossy encoded audio.
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The Levels of my Dolby Digital files aren't the same as the original audio.
6.
Dolby Digital levels are only meant to be compared to other Dolby Digital levels.
They will not be the same as the original audio. They have "Dialog Normalization" and
audio compression/expansion that will make the levels be consistent with other Dolby
Digital AC-3 files. Please refer to our manuals and included whitepapers. It is the job of
the mixer/engineer to learn and test what Dolby options settings are appropriate for the
specific material being encoded. Dolby Lab's LM100 Broadcast Loudness Meter, Dolby Media Meter, orDP600 are tools to get a reference Dialog Normalization level for the material.
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Doesn't Dolby Digital or DTS turn my stereo audio into surround?
7.
No, Dolby Digital and DTS are competing lossy data compression schemes that
shrink the size and data rate of the audio. They do not create surround sound. You
import the already recorded 5.1 surround audio files into SurCode to be encoded.
Nothing can create true surround from stereo or mono files (say a helicopter flying in a
circle around the speakers). Your surround receiver should already have settings to get
the signal to all the speakers, or you can use your receivers Pro Logic II decoder to
simulate surround sound. Up-sampling audio does not improve the audio quality of the
sound file and takes up more space, so we see no need to offer up-sampling as an
integrated feature.
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I'm not getting surround out of my SurCode Dolby Digital plug-in in Premiere
Pro.
8.
Premiere Pro's Master Mixer feeds our SurCode Dolby Digital plug-in. How the
Master Mixer is set up (mono, stereo, surround) for that project, is what will feed our
encoder. If for instance, the Master Mixer is set up as stereo, our encoder will encode
the stereo audio it receives into Dolby Digital stereo (2/0). It does not create surround
mixes. Other mixers in the project will not feed our plug-in. Please check your projects
settings to make sure you have correctly set up your project's Master Mixer. Please refer
to Adobe's manual or support team if unsure how to set up their mixers. We do not
interact with the sound card or panning of the audio in any way, that is a function of
Premiere's mixer.
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Why won't my Dolby receiver play my SurCode DTS CD/DVD files?
9.
Dolby Labs licenses Dolby Digital and Digital Theater Sound licenses DTS. They
are separate competing companies and have separate proprietary decoders to decode
their own type of compressed data back into audio.
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When I play my DTS CD (or files)all I hear is noise.
10.
The DTS file is a lossy compressed data file. It must be digitally transferred to a
DTS decoder to be assembled back into music. So, a DTS CD can't be played in a
regular CD player. Or, if the DTS file has been modified in any way before being
decoded (played through the analog outs, run through a volume control, etc), it will be
corrupted. DTS has been designed so that the un-decoded files sound like white noise.
So if you just hear white noise, the DTS file is not being decoded, or has become
corrupt.
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Can I use Dolby Digital with DVD-Audio?
11.
DVD-Audio is a format designed to use all of the space on the DVD for audio. Then high-resolution audio can be put on the DVD. DVD-V uses almost all of the space on the DVD for Video leaving very little space for audio. DVD-Video needs Dolby Digital to shrink the file size down so the audio will fit. Since DVD-Audio is using all the space for audio, doesn't need to depend on lossy compression such as Dolby Digital. No lossy compression is accepted in DVD-Audio as it is a format meant for high-resolution stereo and surround audio
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Why can't I make a high resolution surround DVD-Video disk. Why do I need
DVD-Audio?
12.
Because DVD-Video MUST have some type of video, it does not leave enough
room for uncompressed high resolution surround sound. The audio must be encoded
into Dolby Digital or DTS. The DVD-Audio format was specifically created for
uncompressed high resolution stereo and surround sound on DVD disks. Our SurCode products allow one to encode to the different formats as needed.
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