Wideband Speech and Audio Coding in the Perceptual Domain
L. Lin, Eliathamby Ambikairajah, W.H. Holmes · Kluwer Academic Publishers eBooks · 2005
A new critical band auditory filterbank with superior auditory masking properties is proposed and is applied to wideband speech and audio coding. The analysis and synthesis are performed in the perceptual domain using this filterbank. The outputs of the analysis filters are processed to obtain a series of pulse trains that represent neural firing. Simultaneous and temporal masking models are applied to reduce the number of pulses in order to achieve a compact time-frequency parameterization. The pulse amplitudes and positions are then coded using a run-length coding algorithm. The new speech and audio coder produces high quality coded speech and audio, with both temporal and spectral fidelity.