US 11,990,145 B2
Methods, encoder and decoder for handling envelope representation coefficients
Jonas Svedberg, Luleå (SE); Stefan Bruhn, Sollentuna (SE); and Martin Sehlstedt, Luleå (SE)
Assigned to TELEFONAKTIEBOLAGET LM ERICSSON (PUBL), Stockholm (SE)
Filed by Telefonaktiebolaget LM Ericsson (publ), Stockholm (SE)
Filed on Aug. 22, 2022, as Appl. No. 17/821,344.
Application 17/821,344 is a continuation of application No. 16/783,823, filed on Feb. 6, 2020, granted, now 11,430,455.
Application 16/783,823 is a continuation of application No. 15/774,535, granted, now 10,580,422, issued on Mar. 3, 2020, previously published as PCT/EP2017/082951, filed on Dec. 15, 2017.
Claims priority of provisional application 62/583,791, filed on Nov. 9, 2017.
Claims priority of provisional application 62/435,173, filed on Dec. 16, 2016.
Prior Publication US 2023/0072546 A1, Mar. 9, 2023
This patent is subject to a terminal disclaimer.
Int. Cl. G10L 19/00 (2013.01); G10L 19/02 (2013.01); G10L 19/038 (2013.01)
CPC G10L 19/0212 (2013.01) [G10L 19/038 (2013.01); G10L 2019/0002 (2013.01)] 20 Claims
OG exemplary drawing
 
1. A method performed by an audio encoder for handling input envelope representation coefficients, the method comprising:
quantizing the input envelope representation coefficients to produce quantized input envelope representation coefficients;
determining residual coefficients by subtracting the quantized input envelope representation coefficients from the input envelope representation coefficients;
transforming the residual coefficients to obtain transformed residual coefficients;
applying at least one of a plurality of gain-shape coding schemes on the transformed residual coefficients in order to achieve gain-shape coded residual coefficients, where the plurality of gain-shape coding schemes have mutually different trade-offs in one or more of gain resolution and shape resolution for one or more of the transformed residual coefficients; and
providing a representation of the quantized envelope representation coefficients, the gain-shape coded residual coefficients, and information on the at least one applied gain-shape coding scheme for transmission to an audio decoder.