Rate-distortion efficient amplitude modulated sinusoidal audio coding
Mads Græsbøll Christensen, Steven van de Par · 2005
In this paper, an improved parametric audio coder is presented. This coder addresses an important issue in audio coding, namely handling of transients. We propose a dedicated coder for transients based on amplitude modulated sinusoids. This coder is then combined with a constant-amplitude sinusoidal coder, and by rate-distortion optimization we choose which of the two is used for each segment. We show by rate-distortion curves and listening tests that the proposed coder offers significant improvements as compared to the constant-amplitude coder.