US 12,033,648 B2
Method and apparatus for processing an audio signal, audio decoder, and audio encoder for removing a discontinuity between frames by subtracting a portion of a zero-input-reponse
Emmanuel Ravelli, Erlangen (DE); Manuel Jander, Hemhofen (DE); Grzegorz Pietrzyk, Nuremberg (DE); Martin Dietz, Nuremberg (DE); and Marc Gayer, Erlangen (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 Jun. 22, 2023, as Appl. No. 18/339,915.
Application 18/339,915 is a continuation of application No. 17/580,578, filed on Jan. 20, 2022.
Application 17/580,578 is a continuation of application No. 15/412,920, filed on Jan. 23, 2017, abandoned.
Application 15/412,920 is a continuation of application No. PCT/EP2015/065219, filed on Jul. 3, 2015.
Claims priority of application No. 14178821 (EP), filed on Jul. 28, 2014.
Prior Publication US 2023/0335147 A1, Oct. 19, 2023
Int. Cl. G10L 19/26 (2013.01); G10L 19/005 (2013.01); G10L 19/022 (2013.01); G10L 19/03 (2013.01); G10L 19/12 (2013.01); G10L 19/20 (2013.01); H04B 1/10 (2006.01); G10L 21/0364 (2013.01); G11B 27/038 (2006.01)
CPC G10L 19/26 (2013.01) [G10L 19/005 (2013.01); G10L 19/022 (2013.01); G10L 19/03 (2013.01); G10L 19/12 (2013.01); G10L 19/20 (2013.01); G10L 21/0364 (2013.01); G11B 27/038 (2013.01); H04B 1/1027 (2013.01)] 13 Claims
OG exemplary drawing
 
1. A method for processing an audio signal, the method comprising:
filtering a past frame of the audio signal using a set of first filter parameters for obtaining a filtered past frame,
filtering a current frame of the audio signal using a set of second filter parameters for obtaining a filtered current frame, and
removing a discontinuity between the filtered past frame and the filtered current frame of the audio signal using a linear predictive filter,
wherein initial states of the linear predictive filter are obtained by filtering a last part of the past frame using the set of second filter parameters, and
wherein removing the discontinuity comprises processing a beginning portion of the filtered current frame, wherein the beginning portion of the current frame comprises a predefined number of samples being less or equal than a total number of samples in the current frame, and wherein processing the beginning portion of the current frame comprises subtracting a beginning portion of a zero-input-response (ZIR) from the beginning portion of the filtered current frame.