MDCT based perceptual audio coders shape the quantization noise according to simple psychoacoustic rules and general behavioral aspects of the audio signal such as stationarity and tonality. As a consequence, the resulting compressed audio representation has little semantic value making difficult MPEG-7 oriented operations such as feature extraction and audio modification directly in the compressed domain. First results in this perspective are reported using an enhanced version of an MDCT based perceptual coder that implements sinusoidal modeling and subtraction directly in the MDCT frequency domain, as well as spectral envelope modeling and normalization. The implications on the coding efficiency are also addressed.
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