The DTS core-plus extension multichannel audio coding methodology permits established audio coding systems to operate at higher bit rates and/or higher sampling frequencies while remaining compatible with first-generation decoders (legacy decoders). While popular algorithms such as DTS Coherent Acoustics, Dolby AC-3 and MPEG II can all benefit from our process, the paper describes in detail its specific application to the DTS subband ADPCM coding algorithm. A compatible bitstream is made up of -core- data, representing 48-kHz encoded audio signals; and -extension- data, representing differential audio data and/or higher frequency components. Existing core-only decoders make use of the core data to reproduce 48-kHz sampled audio. New 96-kHz decoders make use of both core and extension data to reproduce 96-kHz audio. The paper also describes the efficient real-time implementations of the 5.1-channel, core+extension decoder on a single SHARC 21065L 32-bit floating-point processor and the encoder on a Pentium III processor.:

Authors: Fejzo, Zoran; Smyth, Stephen; McDowell, Keith; You, Yu-Li; Smith, Paul
Affiliation: Digital Theater Systems, Inc., Agoura Hills, CA
AES Convention: 109 (September 2000) Paper Number: 5259
Publication Date: September 1, 2000 Import into BibTeX
Subject: Low Bit-Rate Coding
Permalink: https://www.aes.org/e-lib/browse.cfm?elib=9079

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