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Over the past decade, audio coding technology has seen standardization andthe development of many frameworks incorporated with linear predictive coding(LPC). As LPC reduces information in the frequency domain, LP-basedfrequency-domain noise-shaping (FDNS) was previously proposed. To codetransient signals effectively, FDNS with temporal noise shaping (TNS) hasemerged. However, these mainly operated in the modified discrete cosinetransform domain, which essentially accompanies time domain aliasing. In thispaper, a unified noise-shaping (UNS) framework including FDNS and complexLPC-based TNS (CTNS) in the DFT domain is proposed to overcome the aliasingissues. Additionally, a modified polar quantizer with phase contrast control isproposed, which saves phase bits depending on the frequency envelopeinformation. The core coding feasibility at low bit rates is verified throughvarious objective metrics and subjective listening evaluations.

Audio coding with unified noise shaping and phase contrast control