Progress in LPC-based frequency-domain audio coding
Takehiro Moriya, Ryosuke Sugiura, Yutaka Kamamoto, Hirokazu Kameoka, Noboru Harada · APSIPA Transactions on Signal and Information Processing · 2016
moriya, ryosuke sugiura, yutaka kamamoto, hirokazu kameoka and noboru harada This paper describes the progress in frequency-domain linear prediction coding (LPC)-based audio coding schemes.Although LPC was originally used only for time-domain speech coders, it has been applied to frequency-domain coders since the late 1980s.With the progress in associated technologies, the frequency-domain LPC-based audio coding scheme has become more promising, and it has been used in speech/audio coding standards, such as MPEG-D unified speech and audio coding and 3GPP enhanced voice services since 2010.Three of the latest investigations on the representations of LPC envelopes in frequency-domain coders are shown.These are the harmonic model, frequency-resolution warping and the Powered All-Pole Spectral Envelope, all of which are aiming at further enhancement of the coding efficiency.