These methods should also work for BeSweet, Vegas Video + DVD, Scenarist, and other software-based encoders.Įvery Dolby Digital encoder has some basic parameters that need to be set. I have personally tested the Sonic Foundry 5.1 Plug-In Pack for ACID Pro, as well as Sonic Foundry Soft Encode. All Dolby-certified encoders (and some non-certified ones) will have the appropriate parameters available to follow this procedure. The methods I'm about to present here for encoding Dolby Digital are generic and do not apply specifically to any one encoder. Further, Dolby Digital allows for different program material to be equalized, so that volume does not have to be adjusted when switching between inherently quiet programs and inherently loud programs. Low-volume sounds are boosted automatically so they can be heard, whereas high-volume sounds are quieted down so that speakers aren't blown and other persons in the home are not disturbed. Further, background noise in the home can easily drown out those subtleties in the soundtrack.ĭolby's answer is to allow the decoder to modify the sound to compensate for these problems. Dolby's dilemma was: "How do we bring this audio, with its huge dynamic range, into the home?" This is a major problem - most homes don't have the speakers and amplifiers necessary to shake the living room. Huge dynamic ranges are possible, where the slightest whisper of dialogue is audible, yet gunshots and explosions can be earth-shattering. The movie industry has a huge advantage when producing audio for the theater - the theater has large speakers and amplifiers, and a quiet, near-ideal listening environment. Most audio destined for DVDs is audio originally recorded for use in the movie theater. Of prime example is the current problem: Why is Dolby Digital so much quieter compared to my original sound? As such, there is often confusion about their methods and philosophy to those of us who are not privy to that information. pdf documents.ĭolby Labs has been doing high-quality audio with cutting-edge techniques for a long time, using their past experience as a guide. You will need Adobe Acrobat Reader to view these. The other is Dolby Digital Professional Encoding Guidelines which gives an excellent explanation of the dialogue Normalization parameter. The first is Standards and Practices for Authoring Dolby Digital and Dolby E Bitstreams, which has the best information on Dynamic Range Compression. The primary references for the information contained in this guide are two guides on Dolby's web site. This guide aims to educate about how Dolby Digital audio should be encoded, and how to make it sound best. These problems are primarily volume-related, with some dynamic range compression issues as well. Many people on the forum have experienced problems when encoding audio using Dolby Digital. How to Properly Encode Dolby Digital Audio (AC3)
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