US 12,488,802 B2
Method and apparatus for error recovery in predictive coding in multichannel audio frames
Chamran Moradi Ashour, Stockholm (SE); and Erik Norvell, Upplands Väsby (SE)
Assigned to TELEFONAKTIEBOLAGET LM ERICSSON (PUBL), Stockholm (SE)
Appl. No. 17/599,974
Filed by Telefonaktiebolaget LM Ericsson (publ), Stockholm (SE)
PCT Filed Mar. 27, 2020, PCT No. PCT/EP2020/058639
§ 371(c)(1), (2) Date Sep. 29, 2021,
PCT Pub. No. WO2020/201040, PCT Pub. Date Oct. 8, 2020.
Claims priority of provisional application 62/826,084, filed on Mar. 29, 2019.
Prior Publication US 2022/0172732 A1, Jun. 2, 2022
Int. Cl. G10L 19/008 (2013.01); G10L 19/22 (2013.01); G10L 19/26 (2013.01); G10L 25/21 (2013.01); G10L 25/78 (2013.01)
CPC G10L 19/008 (2013.01) [G10L 19/22 (2013.01); G10L 19/26 (2013.01); G10L 25/21 (2013.01); G10L 25/78 (2013.01)] 26 Claims
OG exemplary drawing
 
1. A method of replacing decoded parameters in a received multichannel signal in a decoder, the method comprising:
decoding a current frame of consecutive frames of the received multichannel signal;
responsive to receiving a previous frame bad frame indicator while operating in a predictive decoding mode with the current frame of the consecutive frames:
determining whether a parameter stability measure for a last observed active source is below a threshold; and
activating a parameter recovery by retrieving estimated parameters, wherein the estimated parameters are decoded parameters of an earlier frame of consecutive frames of the received multichannel signal, and replacing decoded parameters of the current frame with the estimated parameters responsive to the parameter stability measure being below the threshold, and
responsive to the parameter stability measure not being below the threshold, detecting whether the current frame represents an active source:
responsive to determining that the current frame represents an active source:
storing decoded parameters of the current frame as estimated parameters; and
determining the parameter stability measure.