US 12,444,426 B2
Voice encoding and decoding using transform coefficients adjusted by spectral model and spectral shaper
Lars Villemoes, Jarfalla (SE); Janusz Klejsa, Solna (SE); and Per Hedelin, Gothenburg (SE)
Assigned to DOLBY INTERNATIONAL AB, Dublin (IE)
Filed by DOLBY INTERNATIONAL AB, Dublin (IE)
Filed on Mar. 31, 2023, as Appl. No. 18/194,251.
Application 18/194,251 is a continuation of application No. 16/719,857, filed on Dec. 18, 2019, granted, now 11,621,009.
Application 16/719,857 is a continuation of application No. 16/032,921, filed on Jul. 11, 2018, granted, now 10,515,647, issued on Dec. 24, 2019.
Application 16/032,921 is a continuation of application No. 14/781,219, granted, now 10,043,528, issued on Aug. 7, 2018, previously published as PCT/EP2014/056851, filed on Apr. 4, 2014.
Claims priority of provisional application 61/875,553, filed on Sep. 9, 2013.
Claims priority of provisional application 61/808,675, filed on Apr. 5, 2013.
Prior Publication US 2023/0238011 A1, Jul. 27, 2023
This patent is subject to a terminal disclaimer.
Int. Cl. G10L 19/032 (2013.01); G10L 19/02 (2013.01); G10L 19/06 (2013.01)
CPC G10L 19/032 (2013.01) [G10L 19/02 (2013.01); G10L 19/06 (2013.01)] 3 Claims
OG exemplary drawing
 
1. A method of audio signal encoding, comprising:
receiving an input audio signal;
transforming a sequence of samples of the input audio signal into a current block of transform coefficients;
estimating a spectral envelope associated with the current block;
flattening the current block of transform coefficients based on the spectral envelope;
determining an envelope gain based on spectral energy values of the spectral envelope;
determining an allocation envelope based on the spectral envelope and one or more parameters of a model, where the one or more model parameters are indicative of a fundamental frequency of a multi-sinusoidal signal model;
adjusting the allocation envelope based on the envelope gain; and
entropy coding the flattened transform coefficients based on a variance of at least one transform coefficient estimated based on the adjusted allocation envelope.