PERCEPTUALLY IMPROVED ENHANCEMENT OF ENCODED ACOUSTIC SIGNALS

摘要

The invention relates to encoding of broadband and narrowband acoustic sourc e signals (x) such that the perceived sound quality of corresponding reconstructed signals is improved in comparison to the known solutions. An enhancement estimation unit (102), operating in serial or in parallel with t he regular encoding / decoding means (101), perceptually enhances a reconstruct ed acoustic source signal by utilisation of an enhancement spectrum (C) comprising a larger number of spectral coefficients than the number of sampl e values in corresponding frames of the signals carrying the basic encoded representation of the acoustic source signal. The thus extended block length of the enhancement spectrum frame provides a basis for accomplishing the desired improvement of the perceived sound quality.