US 11,990,147 B2
Adaptive transition frequency between noise fill and bandwidth extension
Gustaf Ullberg, Stockholm (SE); Manuel Briand, Djursholm (SE); and Anisse Taleb, Kista (SE)
Assigned to TELEFONAKTIEBOLAGET LM ERICSSON (PUBL), Stockholm (SE)
Filed by Telefonaktiebolaget LM Ericsson (publ), Stockholm (SE)
Filed on Dec. 21, 2020, as Appl. No. 17/128,665.
Application 17/128,665 is a continuation of application No. 16/230,777, filed on Dec. 21, 2018, granted, now 10,878,829.
Application 16/230,777 is a continuation of application No. 15/639,347, filed on Jun. 30, 2017, granted, now 10,199,049, issued on Feb. 5, 2019.
Application 15/639,347 is a continuation of application No. 14/955,645, filed on Dec. 1, 2015, granted, now 9,711,154, issued on Jul. 18, 2017.
Application 14/955,645 is a continuation of application No. 12/674,341, granted, now 9,269,372, issued on Feb. 23, 2016, previously published as PCT/SE2008/050969, filed on Aug. 26, 2008.
Claims priority of provisional application 60/968,134, filed on Aug. 27, 2007.
Prior Publication US 2021/0110836 A1, Apr. 15, 2021
Int. Cl. G10L 19/02 (2013.01); G10L 19/028 (2013.01); G10L 19/032 (2013.01); G10L 21/038 (2013.01); G10L 19/035 (2013.01)
CPC G10L 19/028 (2013.01) [G10L 19/0204 (2013.01); G10L 19/032 (2013.01); G10L 21/038 (2013.01); G10L 19/035 (2013.01)] 17 Claims
OG exemplary drawing
 
1. A method for processing an audio signal, comprising:
obtaining a first set of quantized coefficients representing at least a portion of the audio signal, wherein each quantized coefficient included in the first set of quantized coefficients is in one frequency band that is included in an ordered set of frequency bands {B(1), . . . , B(N)}, where N>1, each of the frequency bands B(1) to B(N) comprising a plurality of frequencies between an upper frequency of the frequency band and a lower frequency of the frequency band;
determining a transition frequency, wherein the transition frequency divides the set of frequency bands into a first subset of frequency bands and a second subset of frequency bands;
filling holes in the first subset of frequency bands using a first algorithm; and
filling holes in the second subset of frequency bands using a second algorithm, wherein
determining the transition frequency comprises:
determining whether the number of quantized coefficient within band B(N) is greater than zero; and
if the number of quantized coefficient within band B(N) is greater than zero, then determining the transition frequency based on band B(N), otherwise determining the transition frequency based on a band closest in order to band B(N) that has at least one quantized coefficient.