Recently introduced, the ISO/MPEG-2 Advanced Audio Coding (AAC) coding technology provides a powerful framework which covers almost any application from simple monophonic compression to full-featured multichannel coding. Since the AAC codec constitutes the core of the high-quality part of the MPEG-4 audio coder, further enhancements in terms of compression efficiency are desirable for use at very low bit rates. This paper describes the extension of the AAC-based MPEG-4 audio coder by means of the so-called Perceptual Noise Substitution (PNS) technique as it was accepted by MPEG-4.
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