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MPEG Unified Speech and Audio Coding
April-June 2013 (vol. 20 no. 2)
pp. 72-78
Schuyler Quackenbush, Audio Research Labs
The MPEG Audio Subgroup has a rich history of accomplishments in creating music coding technology. At higher bit rates, MPEG technology can represent arbitrary sounds, including the human voice, with excellent quality. MPEG-1 and MPEG-2 Audio coders use perceptually shaped quantization noise as the primary tool for achieving compression. The MPEG-4 High-Efficiency Advanced Audio Coding (AAC) standard is a single technology capable of compressing speech, speech mixed with music, or music signals with quality that is always at least as good as the best of two state-of-the-art reference codecs, one optimized for speech and mixed content (AMR-WB+) and the other optimized for music and general audio (HE-AACv2). This article provides an overview of the USAC architecture and summarizes the performance relative to the best state-of-the-art speech and audio codecs.
Index Terms:
Music,Coding,MPEG standards,HE-AACv2,multimedia,multimedia applications,MPEG,MPEG-4 High-Efficiency Advanced Audio Coding (AAC) standard,audio codecs,music coding technology,compressed speech,AMR-WB+
Schuyler Quackenbush, "MPEG Unified Speech and Audio Coding," IEEE Multimedia, vol. 20, no. 2, pp. 72-78, April-June 2013, doi:10.1109/MMUL.2013.24
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