Coding Technologies has developed enhancement technologies for perceptual audio codecs enabling totally new services like mobile music download and streaming, or digital broadcasting in the AM bands. Besides developing these technologies, Coding Technologies provides highly optimized implementations on multiple hardware and software platforms to enable fast time to market for its customer products.

The aacPlus audio codec family consists of three MPEG technologies: Advanced Audio Coding (AAC), coupled with Coding Technologies' groundbreaking Spectral Band Replication (SBR) and Parametric Stereo (PS) technologies. aacPlus v1 was standardized by MPEG as MPEG-4 HE AAC, combining AAC and SBR. With the addition of Parametric Stereo, aacPlus v2 is the state-of-the-art low bit rate open standards audio codec.

MPEG Surround introduces a new paradigm in multichannel audio coding, leading to another major step in compression efficiency. Jointly developed by Coding Technologies, Fraunhofer IIS, Philips and Agere, MPEG Surround offers unprecedented opportunities for existing as well as for new services in all fields of digital audio and audio/video distribution. MPEG Surround can be combined with any audio codec standardized in MPEG, the resulting compression system will offer 5.1 multi-channel audio coding at bit rates only slightly above the normal operating range of the underlying core codec in stereo mode.

mp3PRO is the next version of MP3. Compatible with all existing MP3 content and encoders, mp3PRO achieves CD quality at 64 kbps. mp3PRO cuts your streaming bandwidth bill in half and doubles the amount of music on your portable player. Already widely deployed for Internet streaming, mp3PRO will migrate to replace existing MP3.

Spectral Band Replication (SBR) fundamentally enables a new wave of high quality audio services such as mobile streaming via 2.5 and 3G networks, digital radio services, or Internet streaming. SBR can be used to either enhance audio quality at a given bit rate or to decrease the bit rate required for a given application. The combination of AAC and SBR is called aacPlus v1 within the aacPlus audio codec family.

Parametric Stereo (PS) is an enhancement technology for low bit rate stereo signals by recreating the stereo image based on the parametric stereo information transmitted along a mono bit stream. Jointly developed by Coding Technologies and Philips, Parametric Stereo increases the compression efficiency of aacPlus a second time. The combination of AAC, SBR and PS is called aacPlus v2 and is fully specified in MPEG-4.

Applications of these technologies are already in widespread use and are gaining more and more importance for mobile, digital radio, and Internet audio distribution.

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