Recent research in high-quality audio coding seeks not only
improved coding gains but also new functionalities such as easy semantic
access to compressed audio material and audio modification
in the compressed domain. These objectives imply the decomposition of the
audio signal into several components of specific semantic value,
such as sinusoidal components, that take
advantage of selective coding and parametrization tools.
In this paper we presume an MDCT based audio coding
environment and present a new technique combining spectral envelope normalization
with accurate subtraction of sinusoidal components in the MDCT frequency domain.
It is shown how a parametrization of L stationary sinusoids in the complex ODFT
spectrum can lead to the effective subtraction in the real MDCT spectrum, of 3L spectral lines.
A demonstration of the implementation of the technique is available on the Internet.
