Low bit-rate audio coding with hybrid representations.
Laurent Daudet, Ph. GUILLEMAIN, Richard Kronland-Martinet, Bruno Torrésani · 1999
We present a general audio coder based on a structural decomposition: the signal is expanded into three features: its harmonic part, the transients and the remaining part (referred as the "noise"). The first two of these "layers" can be very efficiently encoded in a well-chosen basis. The noise is by construction modelized as a gaussian (colored) random noise. Furthermore, this decomposition allows a good time-frequency psycoacoustic modeling, as it dircetly provides us with the tonal and nontonal part of the signal.