SPECTRAL SMOOTHING DEVICE, ENCODING DEVICE, DECODING DEVICE, COMMUNICATION TERMINAL DEVICE, BASE STATION DEVICE AND SPECTRAL SMOOTHING METHOD

摘要

FIELD: physics.SUBSTANCE: input spectrum is broken into a plurality of subbands. A representative value is calculated for each subband using an arithmetic mean and a geometric mean. Nonlinear conversion is performed with respect to each representative value. The nonlinear conversion characteristic is amplified as the value increases. The representative value, which was subjected to nonlinear conversion for each subband, is smoothed in the frequency domain.EFFECT: faster spectral smoothing and higher quality of the output audio signal.11 cl, 15 dwg