The audio signal needs to be compressed, to an approved standard. Why? Uncompressed audio like video would consume too much of the disc space.
It needs to be compressed (encoded) to Dolby Digital, DTS, or the MPEG standard. A maximum of 8 audio streams are supported.
Why Use DVDTECH?
DVDTECH, in-house Digital audio suite, ensures that not only is your audio encoded to the highest Dolby and DTS standards, its checked for video synchronisation, phase effects, and metadata information by qualified staff.
If your source needs to be distributed on a DVD around the world, our expert staff can conform audio from NTSC 29.97 fps or Film 24 fps to PAL 25 Fps, and vice versa.
Audio formats that we produce are :-
- Dolby Digital (5.1, 2.0, 1.0)
- Dolby Surround (Lt/Rt)
- DTS Digital Theatre Sound
- PCM Pulse Code Modulation
We accept the following professional audio formats.
- DTRS (DA88, DA98-HR)
If you are submitting audio on DA88 for 5.1 Dolby Encoding or DTS, then please conform the following track layout, referred to as Mode 4
- Resolution = 24/16-bit
- Sample rate = 48kHz (NOT 44.1!)
- TC = 25fps, conformed to the video master
Track configuration :
- Track 1 = Left
- Track 2 = Right
- Track 3 = Centre
- Track 4 = LFE / Subwoofer
- Track 5 = Left Surround
- Track 6 = Right Surround
- Track 7 = LO (Left Only) / Stereo Left
- Track 8 = RO (Right Only) / Stereo Right
Please remember to make sure that the 5.1 audio, when down-mixed into 2-channel does NOT create phasing issues, i.e. phase cancellation ; as some people may play the 5.1 on a stereo system.
Dolby Digital is a standard multichannel audio format for DVD all over the world. Dolby Digital has been used almost exclusively in top professional DVD authoring studios and production facilities.
In addition to the encoded audio, Dolby Digital carries additional information (metadata) that is input during encoding to control audio parameters in a consumer decoder. Metadata allows the decoder to
1. fit multichannel program material to the number and configuration of speakers (Downmixing);
2. play back all programs with consistent loudness (Dialogue Normalization);
3. alter the dynamic range to suit different listening conditions and/or equipment capabilities (Dynamic Range Control).
Choosing the correct values for these and other metadata parameters is a vital step in the Dolby Digital encoding process. Our audio engineers set metadata values in our facility with the confidence that the client will experience the audio as closely as possible to what the producer intended.