4 Outline description

26.4043GPPEnhanced aacPlus encoder Spectral Band Replication (SBR) partEnhanced aacPlus general audio codecGeneral audio codec audio processing functionsRelease 17TS

This TS is structured as follows:

Section 5.1 gives an encoder overview description. Section 5.2 gives a detailed description of the filterbanks used in the encoder. Section 5.3 gives a specification of the used frequency band tables. Section 5.4 gives a detailed description of the time grid calculation and the transient detection. Section 5.5 gives a detailed description of the envelope estimation. Section 5.6 gives a detailed description of the estimation of the additional control parameters. Section 5.7 gives detailed description of the data quantisation. Section 5.8 gives a detailed description of the envelope coding.