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Dolby Digital (AC-3) Audio Coding
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Dolby Digital audio compression (known as AC-3 in standards documents) provides for up to 51 channels of discrete audio18 One of the advantages of Dolby Digital is that it analyzes the audio signal to differentiate short, transient signals from long, continuous signals Short sample blocks are then used for short sounds and long sample blocks are used for longer sounds This results in smoother encoding without transient suppression and block boundary effects that can occur with fixed block sizes For compatibility with existing audio/video systems, Dolby Digital decoders can downmix multichannel programs to ensure that all the channels are present in their proper proportions for mono, stereo, or Dolby Pro Logic reproduction Dolby Digital uses a frequency transform somewhat like the DCT transform of JPEG and MPEG and groups the resulting values into frequency bands of varying widths to match the critical bands of human hearing Each transformed block is converted to a floating-point frequency representation that is allocated a varying number of bits from a common pool, according to the importance of the frequency band The result is a constant bitrate (CBR) data stream Dolby Digital also includes dynamic range information so that different listening environments can be compensated for Original audio mixes, such as movie sound tracks, which are designed for the wide dynamic range of a theater, can be encoded to maintain the clarity of the dialogue and to enable emphasis of soft passages when played at low volume in the home Dolby Digital was developed from the ground up as a multichannel coder designed to meet the diverse and often contradictory needs of consumer delivery It also has a significant lead over other multichannel systems in both marketing and standards adoption Millions of Dolby Digital decoders are in living rooms, and Dolby Digital was chosen for the US DTV (digital television) standard and is being used for digital satellite systems and most other digital television systems
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Dolby Digital Plus, also known as Enhanced AC-3, is an extension of Dolby Digital that adds a number of features to the already popular codec In particular, DD+ provides spectral coding techniques that help to improve audio reproduction at very low data rates (such as, for streaming applications), while adding a mechanism for supporting more discrete channels and higher data rates Unfortunately, Dolby Digital Plus comes with a few problems, as well First, legacy A/V receivers that support Dolby Digital via digital connections (eg, S/PDIF) will not natively support the decoding of Dolby Digital Plus Fortunately, Dolby Digital Plus can address this by down converting to legacy Dolby Digital at a high data rate (640 kbps) to preserve as much of the DD+ quality as possible If the Dolby Digital Plus stream to be converted contains more than 51 channels of audio, the channels beyond 51 are discarded during the conver18Dolby Digital can support up to 61 channels by matrixing an additional rear center channel into the left and
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the right surround channels, which may be reproduced with one or more rear center speakers
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sion process, but due to the structure of the DD+ bitstream, the content from those channels is retained in the converted Dolby Digital stream by means of a downmix process that occurs in the Dolby Digital Pus encoder during the production process However, only the 51 downmix of streams originally with 61 or 71 channels will be heard Second, most of the extra features of Dolby Digital Plus have the greatest effect at very low encoding rates rather than at the data rates one would typically expect on a Blu-ray disc DD+ is able to retain its level of perceptual quality at lower data rates, but in the moderate and higher data rate ranges that are more consistent with what would be expected to be used on a BD disc, the difference in quality between AC-3 and DD+ is actually quite small Even though DD+ can support data rates as high as 47 Mbps on BD, such high rates would offer little perceived improvement to the audio experience in a 51-channel surround environment
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