US 12,087,314 B2
Audio encoding/decoding based on an efficient representation of auto-regressive coefficients
Volodya Grancharov, Solna (SE); and Sigurdur Sverrisson, Kungsängen (SE)
Assigned to Telefonaktiebolaget LM Ericsson (publ), Stockholm (SE)
Filed by Telefonaktiebolaget LM Ericsson (publ), Stockholm (SE)
Filed on Jan. 31, 2023, as Appl. No. 18/103,871.
Application 18/103,871 is a continuation of application No. 17/199,869, filed on Mar. 12, 2021, granted, now 11,594,236.
Application 17/199,869 is a continuation of application No. 16/832,597, filed on Mar. 27, 2020, granted, now 11,011,181, issued on May 18, 2021.
Application 16/832,597 is a continuation of application No. 14/994,561, filed on Jan. 13, 2016, abandoned.
Application 14/994,561 is a continuation of application No. 14/355,031, granted, now 9,269,364, issued on Feb. 23, 2016, previously published as PCT/SE2012/050520, filed on May 15, 2012.
Claims priority of provisional application 61/554,647, filed on Nov. 2, 2011.
Prior Publication US 2023/0178087 A1, Jun. 8, 2023
Int. Cl. G10L 19/038 (2013.01); G10L 19/02 (2013.01); G10L 19/032 (2013.01); G10L 19/06 (2013.01); G10L 21/038 (2013.01); G10L 19/00 (2013.01)
CPC G10L 19/038 (2013.01) [G10L 19/0204 (2013.01); G10L 19/032 (2013.01); G10L 19/06 (2013.01); G10L 21/038 (2013.01); G10L 2019/001 (2013.01)] 20 Claims
OG exemplary drawing
 
1. A method, in a digital circuit, of decoding a digitally encoded line spectral frequencies (LSF) representation of linear prediction coefficients that partially represent an audio signal, said method comprising:
reconstructing coefficients of a low-frequency part of the LSF representation corresponding to a low-frequency part of the audio signal, from indices representing the coefficients of the low-frequency part;
reconstructing coefficients of a high-frequency part of the LSF representation based on a decoded frequency grid and based on flipping the decoded coefficients for the low-frequency part around a decoded mirroring frequency that separates the low-frequency part from the high-frequency part.