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Wideband codec enables HD voice in IP networks

Posted: 04 May 2007 ?? ?Print Version ?Bookmark and Share

Keywords:super wideband codec? HD voice? VoIP solutions?

Texas Instruments Inc. (TI) is licensing the Low Delay AAC super wideband codec from the Fraunhofer Institute for Integrated Circuits IIS. Powered by TI's DSPs, the MPEG-4 AAC-LD super-wideband codec offers substantial benefits compared to earlier wideband audio technology, and has the performance capabilities to make ubiquitous high-definition (HD) voice a reality in global IP networks.

Able to transmit voice at a sample rate of up to 48KHz, the technology offers significant sound quality improvements over traditional narrowband and wideband voice codecs. The technology provides near-CD quality audio at data-rates of 48- to 64Kbps for better clarity with applications like IP-based voice and video, as well as transmission of music over the telephone. The greater sampling rate capabilities of an HD voice channel together with the fidelity of an audio codec accounts for sound quality that is significantly richer and extended at both ends of the spectrum, and produces a perceptible difference in the resonance and intelligibility of voice.

Just as HDTV is revolutionizing the way we watch TV and HD radio enhances the daily commutes for millions of people each day, HD voice will deliver a crisp and clear communications experience. It will also be a critical enabling technology for a host of exciting applications in the future, such as improved speech recognition, real-time language translation, and appliance voice control. At the same time, advances in home networking and broadband technologies will be essential in driving the move to a voice-powered home and beyond, where a person's voice will be able to do everything from conveying a greater depth of meaning and understanding to simply turning on the lights in a room.

With the super-wideband technology, TI's VoIP solutions can deliver CD-quality sound on both ends of a VoIP-enabled phone call, while supporting a full range of voice and music capabilities, including fidelity comparable to MP3 audio. Leveraging DaVinci technology processing performance and TI's VoIP platforms, the AAC LD super-wideband codec can support real-time IP applications including multimedia integration, HD audio and rich, robust sound quality.

"Making our vision for high definition voice a reality will require technical advancements on many fronts including hardware, software, security, voice-processing algorithms and speech-recognition systems," said Fred Zimmerman, TI director for VoIP customer premises solutions. "TI's digital signal processing platforms have already transformed and greatly accelerated many of the basic capabilities that form the foundation of this vision, and with the addition of super-wideband audio technology to our VoIP portfolio, we're that much closer to transforming the world of IP performance."

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