Adaptive RD Optimized Hybrid Sound Coding
Nicolle H. van Schijndel, Julien Bensa, Mads Græsbøll Christensen, Catherine Colomes, Bernd Edler, Richard R. Heusdens, Jesper Rindom Jensen, Søren Holdt Jensen, Willem Bastiaan Kleijn, Valery Kot, Bala Zs Kovesi, Jonas Lindblom, Dominique Massaloux, Omar Aziz Niamut, Fredrik Norden, Jan H. Plasberg, Renat Vafin, Steven van de Par, David Virette, Oliver Wübbolt · TNO Repository · 2008
Traditionally, sound codecs have been developed with a particular application in mind,their performance being optimized for specific types of input signals, such as speech or audio(music), and application constraints, such as low bit rate, high quality, or low delay. There is,however, an increasing need for more generic sound codecs, created by the emergence ofheterogeneous networks and the convergence of communication and entertainment devices.To obtain such versatility, this study employs hybrid sound coding based on operationalrate-distortion (RD) optimization principles. Applying this concept, a prototype coder hasbeen implemented with emphasis on (dynamic) adaptation to the input and to applicationconstraints. With this prototype, listening tests have been performed for different applicationscenarios. The results demonstrate the versatility of the concept while keeping competitivesound quality compared to dedicated state-of-the-art codecs.