Apparatus and method for decoding or encoding an audio signal using energy information values for a reconstruction band

Method of decoding an encoded audio signal comprising an encoded representation of a first set of first spectral portions and an encoded representation of parametric data indicating spectral energies for a second set of second spectral portions, comprising:

• decoding the encoded representation of the first set of first spectral portions to obtain a first set of first spectral portions and decoding the encoded representation of the parametric data to obtain decoded parametric data for the second set of second spectral portions, the decoded parametric data indicating, for individual reconstruction bands, individual energies of the individual reconstruction bands;
• reconstructing spectral values in a reconstruction band of the individual reconstruction bands, the reconstruction band comprising a second spectral portion of the second set of second spectral portions using a first spectral portion of the first set of first spectral portions and using the information on an individual energy for the reconstruction band, the reconstruction band further comprising a further first spectral portion of the first set of first spectral portions and the second spectral portion of the second set of second spectral portions, wherein reconstructing comprises
• determining a survive energy information comprising information on an accumulated energy of the further first spectral portion of the first set of first spectral portions having frequency values in the reconstruction band,
• determining a tile energy information of the second spectral portion of the second set of second spectral portions the reconstruction band for frequency values different from the further first spectral portion of the first set of first spectral portions having frequencies in the reconstruction band, wherein the second spectral portion of the second set of second spectral portions is to be generated by frequency regeneration using the first spectral portion being different from the further first spectral portion of the first set of first spectral portions in the reconstruction band;
• determining a missing energy information for the reconstruction band using the information on the individual energy for the reconstruction band and the survive energy information;
• and
• adjusting the second spectral portion of the second set of second spectral portions in the reconstruction band based on the missing energy information and the tile energy information.

A non-transitory digital storage medium having a computer program stored thereon to perform the method of decoding an encoded audio signal comprising an encoded representation of a first set of first spectral portions and an encoded representation of parametric data indicating spectral energies for a second set of second spectral portions, the method comprising:

• decoding the encoded representation of the first set of first spectral portions to obtain a first set of first spectral portions and decoding the encoded representation of the parametric data to obtain decoded parametric data for the second set of second spectral portions, the decoded parametric data indicating, for individual reconstruction bands, individual energies of the individual reconstruction bands;
• reconstructing spectral values in a reconstruction band of the individual reconstruction bands, the reconstruction band comprising a second spectral portion of the second set of second spectral portions using a first spectral portion of the first set of first spectral portions and using the information on an individual energy for the reconstruction band, the reconstruction band further comprising a further first spectral portion of the first set of first spectral portions and the second spectral portion of the second set of second spectral portions, wherein reconstructing comprises
• determining a survive energy information comprising information on an accumulated energy of the further first spectral portion of the first set of first spectral portions having frequency values in the reconstruction band,
• determining a tile energy information of the second spectral portion of the second set of second spectral portions the reconstruction band for frequency values different from the further first spectral portion of the first set of first spectral portions having frequencies in the reconstruction band, wherein the second spectral portion of the second set of second spectral portions is to be generated by frequency regeneration using the first spectral portion being different from the further first spectral portion of the first set of first spectral portions in the reconstruction band;
• determining a missing energy information for the reconstruction band using the information on the individual energy for the reconstruction band and the survive energy information;
• and
• adjusting the second spectral portion of the second set of second spectral portions in the reconstruction band based on the missing energy information and the tile energy information,
• when said computer program is run by a computer.