PERCEPTUAL AUDIO CODING
Crystal Clear Audio !
In compression of audio material, human perception plays a key role.
Rather than minimizing analytic measures of distortion, such as signal-to-noise
ratio, perceptual coders attempt to minimize the perceived distortion.
In general source coding techniques can be used to remove signal redundancy
and perceptual coding techniques to remove signal irrelevancy. In combination,
these methods yield a high compression ratio while ensuring maximal quality in
the decoded signal. ATC Labs has a long history of innovation in fields of
perceptual audio coding providing superior audio quality in comparison with
market peers. The suite of perceptual audio coding technologies developed by
ATC Labs is embedded in its audio codecs products, TeslaPro and ACC, codec
technology products, ABET and ISR, and can also be utilized to enhance the
quality of a variety of standard based and proprietary audio codecs.
Licensing/Support :
- For licensing details please Contact us at sales@atc-labs.com
- For details on implementations on other platforms please Contact us at info@atc-labs.com
Technology Highlights
Accurate Psychoacoustic Model: A highly optimized model for auditory masking that emphasizes accurate modeling of various factors which collectively determine the level of masking. Our Accurate Psychoacoustic Model has proven to be 15-25% more efficient than the perceptual models found in market peers. Innovative aspects of this model include
- New wideband psychoacoustic modeling schemes that explicitly takes into account some of the wide band phenomenon in masking.
- Models for accurate detection and estimation of tonal components.
- Detailed stereo masking modeling.
- Low-delay audio coding: ACC is an efficient speech/audio codec combining source coding techniques, perceptual coding techniques and bandwidth reduction/extension techniques.
- Novel audio bandwidth extension tools (see Bandwidth Extension).
- A suite of algorithms for low delay audio coding.
- Novel parametric stereo coding techniques for higher efficiency in stereo coding at low bit rates.
- Novel techniques for parametric multichannel coding (see Multichannel Audio Coding).
- Techniques for very low bit rate coding of mixed content.
- Perceptually driven approaches to other problems such as noise reduction, audio post processing and bandwidth extension.
- New signal processing techniques such as windowing functions with attractive characteristics.
Selected Publications :
- Anibal Ferreira and Deepen Sinha, “Accurate and Robust Frequency Estimation in ODFT Domain”, in 2005 IEEE Workshop on Applications of Signal Processing to Audio and Acoustics, October 16-19, 2005... PDF
- Deepen Sinha and Anibal Ferreira, “A New Broadcast Quality Low Bitrate Audio Coding Scheme Utilizing Novel Bandwidth Extension Tools”, in the preprints of 119th Convention of the Audio Engineering Society, October 2005... PDF
- Deepen Sinha and Anibal Ferreira, “A New Class of Smooth Power Complementary Windows and their Application to Audio Signal Processing”, in the preprints of 119th Convention of the Audio Engineering Society, October 2005... PDF
- Anibal Ferreira, Deepen Sinha, “A New Low Delay Codec for Two Way High Quality Communication”, in the preprints of 119th Convention of the Audio Engineering Society, Oct 2005... PDF
- Anibal Ferreira and Deepen Sinha, “Audio Communication Coder”, in the preprints of 120th Convention of the Audio Engineering Society, May 2006... PDF
- Raghuram Annadana, Harinarayanan. E.V, Anibal Ferreira, and Deepen Sinha, “New Results in Low Bit Rate Speech Coding and Bandwidth Extension”, in the preprints of 121st Convention of the Audio Engineering Society, October 2006... PDF
- Anibal Ferreira, “Perceptual Coding Using Sinusoidal Modeling in the MDCT Domain”, 112th Convention of the Audio Engineering Society, May 2002... PDF
- Deepen Sinha, J.D. Johnston, S. Dorward and S.R. Quackenbush, “The Perceptual Audio Coder”, in Digital Signal Processing Handbook, Section 42, pp. 42-1 to 42-18, CRC Press, 1998.
- Anibal Ferreira, “Combined Spectral Envelope Normalization and Subtraction of Sinusoidal Components in the ODFT and MDCT Frequency Domains,” IEEE Workshop on Applications of Signal Processing to Audio and Acoustics, October 21-24 2001, pp. 51-54... PDF
- Anibal Ferreira, “Accurate Estimation in the ODFT Domain of the Frequency, Phase and Magnitude of Stationary Sinusoids”, IEEE Workshop on Applications of Signal Processing to Audio and Acoustics, October 21-24 2001, pp. 47-50... PDF