US 11,996,111 B2
Post filter for audio signals
Barbara Resch, Solna (SE); Kristofer Kjörling, Solna (SE); and Lars Villemoes, Jarfalla (SE)
Assigned to DOLBY INTERNATIONAL AB, Dublin (IE)
Filed by DOLBY INTERNATIONAL AB, Dublin (IE)
Filed on Mar. 17, 2023, as Appl. No. 18/185,691.
Application 15/792,589 is a division of application No. 15/086,409, filed on Mar. 31, 2016, granted, now 9,858,940, issued on Jan. 2, 2018.
Application 18/185,691 is a continuation of application No. 17/532,775, filed on Nov. 22, 2021, granted, now 11,610,595.
Application 17/532,775 is a continuation of application No. 17/073,228, filed on Oct. 16, 2020, granted, now 11,183,200, issued on Nov. 23, 2021.
Application 17/073,228 is a continuation of application No. 16/351,133, filed on Mar. 12, 2019, granted, now 10,811,024, issued on Oct. 20, 2020.
Application 16/351,133 is a continuation of application No. 15/792,589, filed on Oct. 24, 2017, granted, now 10,236,010, issued on Mar. 19, 2019.
Application 15/086,409 is a continuation of application No. 14/936,408, filed on Nov. 9, 2015, granted, now 9,343,077, issued on May 17, 2016.
Application 14/936,408 is a continuation of application No. 13/703,875, granted, now 9,224,403, issued on Dec. 29, 2015, previously published as PCT/EP2011/060555, filed on Jun. 23, 2011.
Claims priority of provisional application 61/361,237, filed on Jul. 2, 2010.
Prior Publication US 2023/0282222 A1, Sep. 7, 2023
This patent is subject to a terminal disclaimer.
Int. Cl. G10L 19/00 (2013.01); G10L 19/02 (2013.01); G10L 19/032 (2013.01); G10L 19/09 (2013.01); G10L 19/12 (2013.01); G10L 19/125 (2013.01); G10L 19/20 (2013.01); G10L 19/22 (2013.01); G10L 19/26 (2013.01); G10L 21/003 (2013.01); G10L 21/007 (2013.01); G10L 21/013 (2013.01); G10L 19/107 (2013.01)
CPC G10L 19/26 (2013.01) [G10L 19/02 (2013.01); G10L 19/032 (2013.01); G10L 19/09 (2013.01); G10L 19/12 (2013.01); G10L 19/125 (2013.01); G10L 19/20 (2013.01); G10L 19/22 (2013.01); G10L 19/265 (2013.01); G10L 21/003 (2013.01); G10L 21/007 (2013.01); G10L 21/013 (2013.01); G10L 19/0212 (2013.01); G10L 19/107 (2013.01)] 6 Claims
OG exemplary drawing
 
1. A method of decoding a bit stream signal as an audio time signal, the method including the steps of:
decoding a bit stream signal as a preliminary audio time signal according to a coding mode selected from a plurality of coding modes, wherein the plurality of coding modes includes at least a first coding mode which includes a post-filtering step and at least a second coding mode which does not include the post-filtering step,
wherein the post-filtering step applies a pitch-enhancement filter to the preliminary audio time signal, thereby obtaining an audio time signal,
wherein the post-filtering step is selectively omitted responsive to post-filtering information encoded in the bit stream signal, the post-filtering information being indicative of an encoder-side decision of whether or not to omit the post-filtering step, whereby the post-filtering step is selectively omitted in the first coding mode,
and wherein the post-filtering step further includes attenuating noise located in spectral valleys.