Dolby Laboratories DP570 Specifications download pdf (Page 21)

Standards and Practices for Authoring Dolby

Digital and Dolby E Bitstreams

Additionally, it is important that each of the main channels be equidistant from the

mixing position. If this is not possible, the DP570 Multichannel Audio Tool has built-

in delays that can be added to each channel as needed. Please refer to the User’s

Manual for more comprehensive information.

I am recording and mixing a music-only program and I don’t want the

consumer to assert any compression on the audio. What should I do?

While it is often preferred to monitor and select the dynamic range control parameters

for the DVD release or broadcast of a feature film, despite the user-selectable nature

of these parameters they still may not be desired for music-only programs. In these

instances, selecting “None” as the Dynamic Range profile can effectively negate the

dynamic range control parameters. While RF modes will still be active for certain

specific purposes (downmix clipping protection) and the proper setting of the

dialnorm parameter is still critical, setting the profile to “None” prevents the

consumer from asserting any user-selectable dynamic range control.

I’m mixing a film for digital television broadcast. Should I include a

Dolby Digital stream of my final mix along with the discrete tracks?

It depends. Dolby Digital is designed as a one-time decodable technology. If the

program content is to be simply streamed out through a broadcast encoder, including

a Dolby Digital stream on the audio tracks of your digital videotape is acceptable.

This ensures that the metadata parameters you select will be transported to the

consumer’s home decoder, and your content will be heard as you intended.

However, if the program content will be decoded and further processed, edited, or

sweetened, this would be a distribution process and therefore require a different

encoding technology. The accepted coding technology for the distribution of

multichannel audio for digital television broadcast is Dolby E. If Dolby E equipment is

not available, the best choice for the distribution of multichannel audio for DTV is the

original source audio recorded in baseband PCM format on digital multitrack media.

Can I use a 384/448 kbps data rate for stereo?

Yes. All Dolby Digital decoders support up to at least 448 kbps (DVD and DVB max

spec) data rate irrespective of the number of channels encoded within the Dolby

Digital data stream. The final data rate used is a production choice depending on

many factors, including number of audio tracks, video data rates, and available space

for the audio on a DVD or within the transmission stream, among others. While

192 kbps is a common rate for the production of 2/0 (stereo) Dolby Digital data

streams, there is nothing preventing the use of higher data rates, if desired.

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Dolby Laboratories DP570 Specifications Page 21