US 11,875,805 B2
Audio encoder and decoder for interleaved waveform coding
Kristofer Kjoerling, Solna (SE); Robin Thesing, Nuremberg (DE); Harald Mundt, Furth (DE); Heiko Purnhagen, Sundbyberg (SE); and Karl Jonas Roeden, Solna (SE)
Assigned to Dolby International AB, Dublin (IE)
Filed by Dolby International AB, Amsterdam Zuidoost (NL)
Filed on Oct. 6, 2021, as Appl. No. 17/495,184.
Application 17/495,184 is a continuation of application No. 16/169,964, filed on Oct. 24, 2018, granted, now 11,145,318.
Application 16/169,964 is a continuation of application No. 15/279,365, filed on Sep. 28, 2016, granted, now 10,121,479, issued on Nov. 6, 2018.
Application 15/279,365 is a continuation of application No. 14/781,891, granted, now 9,514,761, issued on Dec. 6, 2016, previously published as PCT/EP2014/056856, filed on Apr. 4, 2014.
Claims priority of provisional application 61/808,687, filed on Apr. 5, 2013.
Prior Publication US 2022/0101865 A1, Mar. 31, 2022
This patent is subject to a terminal disclaimer.
Int. Cl. G10L 19/00 (2013.01); G10L 19/02 (2013.01); G10L 21/038 (2013.01); G10L 21/0388 (2013.01); G10L 19/26 (2013.01)
CPC G10L 19/0208 (2013.01) [G10L 19/02 (2013.01); G10L 19/0212 (2013.01); G10L 19/26 (2013.01); G10L 21/038 (2013.01); G10L 21/0388 (2013.01)] 21 Claims
OG exemplary drawing
 
1. A method for decoding an audio signal in an audio processing system, the method comprising:
receiving a first waveform-coded signal having a spectral content up to a first cross-over frequency;
receiving a second waveform-coded signal having spectral content corresponding to a subset of a frequency range above the first cross-over frequency;
receiving high frequency reconstruction parameters;
performing high frequency reconstruction using at least a portion of 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;
adjusting energy levels of subbands of the frequency extended signal based on a target energy levels for the subbands; and
interleaving 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 for the subbands.