Patent ID: 11875805
Assignee: DOLBY INTERNATIONAL AB
Field: Computer technology (Electrical engineering)
Classification: CPC G | IPC G

Claim 18:
19. An apparatus for decoding an encoded audio signal, the apparatus comprising:
an input interface configured to receive a first waveform-coded signal having a spectral content up to a first cross-over frequency, a second waveform-coded signal having spectral content corresponding to a subset of a frequency range above the first cross-over frequency, and high frequency reconstruction parameters;
high frequency reconstructor configured to receive the first waveform-coded signal and the high frequency reconstruction parameters from the input interface and to perform high frequency reconstruction using the first waveform-coded signal and the high frequency reconstruction parameters so as to generate a frequency extended signal having spectral content above the first cross-over frequency, adjust energy levels of subbands of the frequency extended signal based on target energy levels for the subbands; and
an interleaver configured to receive the frequency extended signal from the high frequency reconstructor and the second waveform-coded signal from the input interface, and to interleave the frequency extended signal with the second waveform-coded signal to generate an interleaved signal, such that spectral envelope energy levels for subbands of the interleaved signal corresponding to the target energy levels.