US 12,334,086 B2
Low bitrate audio encoding/decoding scheme having cascaded switches
Bernhard Grill, Lauf (DE); Roch Lefebvre, Canton de Magog (CA); Bruno Bessette, Sherbrooke (CA); Jimmy Lapierre, Sherbrooke (CA); Philippe Gournay, Sherbrooke (CA); Redwan Salami, Saint-Laurent (CA); Stefan Bayer, Nuremberg (DE); Guillaume Fuchs, Nuremberg (DE); Stefan Geyersberger, Wuerzburg (DE); Ralf Geiger, Nuremberg (DE); Johannes Hilpert, Nuremberg (DE); Ulrich Kraemer, Stuttgart (DE); Jérémie Lecomte, Nuremberg (DE); Markus Multrus, Nuremberg (DE); Max Neuendorf, Nuremberg (DE); Harald Popp, Tuchenbach (DE); and Nikolaus Rettelbach, Nuremberg (DE)
Assigned to Fraunhofer-Gesellschaft zur Foerderung der angewandten Forschung e.V., Munich (DE)
Filed by Fraunhofer-Gesellschaft zur Foerderung der angewandten Forschung e.V., Munich (DE)
Filed on Nov. 7, 2024, as Appl. No. 18/940,536.
Application 18/940,536 is a continuation of application No. 18/451,067, filed on Aug. 16, 2023.
Application 18/451,067 is a continuation of application No. 17/933,567, filed on Sep. 20, 2022, granted, now 11,823,690, issued on Nov. 21, 2023.
Application 17/933,567 is a continuation of application No. 16/834,601, filed on Mar. 30, 2020, granted, now 11,475,902, issued on Oct. 18, 2022.
Application 16/834,601 is a continuation of application No. 16/398,082, filed on Apr. 29, 2019, granted, now 10,621,996, issued on Apr. 14, 2020.
Application 16/398,082 is a continuation of application No. 14/580,179, filed on Dec. 22, 2014, granted, now 10,319,384, issued on Jun. 11, 2019.
Application 14/580,179 is a continuation of application No. 13/004,385, filed on Jan. 11, 2011, granted, now 8,930,198, issued on Jan. 6, 2015.
Application 13/004,385 is a continuation of application No. PCT/EP2009/004652, filed on Jun. 26, 2009.
Claims priority of provisional application 61/079,854, filed on Jul. 11, 2008.
Claims priority of application No. 08017663 (EP), filed on Oct. 8, 2008; and application No. 09002271 (EP), filed on Feb. 18, 2009.
Prior Publication US 2025/0061902 A1, Feb. 20, 2025
This patent is subject to a terminal disclaimer.
Int. Cl. G10L 19/18 (2013.01); G10L 19/008 (2013.01); G10L 19/16 (2013.01); G10L 19/20 (2013.01); G10L 19/26 (2013.01); G10L 19/00 (2013.01); G10L 19/02 (2013.01)
CPC G10L 19/008 (2013.01) [G10L 19/173 (2013.01); G10L 19/18 (2013.01); G10L 2019/0008 (2013.01); G10L 19/0017 (2013.01); G10L 19/0212 (2013.01)] 15 Claims
OG exemplary drawing
 
1. Method of decoding an encoded audio signal, the encoded audio signal comprising a first encoded signal, a first processed signal in a second domain, and a second processed signal in a third domain, comprising:
decoding the first encoded signal to obtain a decoded first signal;
decoding the first processed signal or the second processed signal,
wherein the decoding the first processed signal or the second processed signal comprises:
inverse processing the first processed signal to acquire a first inverse processed signal in the second domain;
inverse processing the second processed signal to acquire a second inverse processed signal in the second domain;
combining the first inverse processed signal and the second inverse processed signal to acquire a combined signal in the second domain; and
converting the combined signal in the second domain to a first domain; to obtain a converted signal, and
combining the converted signal and the decoded first signal to acquire a combined signal in the first domain;
wherein the method comprises post-processing the combined signal in the first domain, wherein an output signal of the post-processing is an expanded version of the combined signal in the first domain, and
wherein the decoding the first encoded signal and the decoding the first processed signal or the second processed signal operate in a block wise manner, wherein a switching over action in the combining the first inverse processed signal and the second inverse processed signal or in the combining the converted signal and the decoded first signal takes place, at a minimum, after a block of a predefined number of samples of a signal, the predefined number of samples forming a frame length for the corresponding combining, and wherein a first size of a first frame length for the combining the converted signal and the decoded first signal is greater than a second size of a second frame length of the combining the first inverse processed signal and the second inverse processed signal.