US 12,249,340 B2
Noise filling in multichannel audio coding
Maria Luis Valero, Nuremberg (DE); Christian Helmrich, Erlangen (DE); and Johannes Hilpert, Nuremberg (DE)
Assigned to Fraunhofer-Gesellschaft zur Foerderung der angewandten Forschung e.V., Munich (DE)
Filed by Fraunhofer-Gesellschaft zur Foerderung der angewandten Forschung e.V., Munich (DE)
Filed on Dec. 21, 2023, as Appl. No. 18/393,252.
Application 18/393,252 is a continuation of application No. 18/146,911, filed on Dec. 27, 2022, granted, now 11,887,611.
Application 18/146,911 is a continuation of application No. 17/217,121, filed on Mar. 30, 2021, granted, now 11,594,235, issued on Feb. 28, 2023.
Application 17/217,121 is a continuation of application No. 16/594,867, filed on Oct. 7, 2019, granted, now 10,978,084, issued on Apr. 13, 2021.
Application 16/594,867 is a continuation of application No. 16/277,941, filed on Feb. 15, 2019, granted, now 10,468,042, issued on Nov. 5, 2019.
Application 16/277,941 is a continuation of application No. 15/002,375, filed on Jan. 20, 2016, granted, now 10,255,924, issued on Apr. 9, 2019.
Application 15/002,375 is a continuation of application No. PCT/EP2014/065550, filed on Jul. 18, 2014.
Claims priority of application No. 13177356 (EP), filed on Jul. 22, 2013; and application No. 13189450 (EP), filed on Oct. 18, 2013.
Prior Publication US 2024/0127837 A1, Apr. 18, 2024
This patent is subject to a terminal disclaimer.
Int. Cl. G10L 19/028 (2013.01); G10L 19/008 (2013.01); G10L 19/035 (2013.01); H04S 3/00 (2006.01)
CPC G10L 19/028 (2013.01) [G10L 19/008 (2013.01); G10L 19/035 (2013.01); H04S 3/008 (2013.01); H04S 2400/01 (2013.01); H04S 2400/03 (2013.01); H04S 2420/03 (2013.01)] 14 Claims
OG exemplary drawing
 
1. A parametric frequency-domain audio decoder, comprising a microprocessor or electronic circuit configured to,
decode, using entropy decoding, from a data stream
a first spectrum of a first channel of a current frame of a multichannel audio signal, wherein the first spectrum is subdivided into scale factor bands, and
derive from data in the data stream, for each scale factor band, a scale factor associated with the respective scale factor band,
check, for a predetermined scale factor band, whether all spectral lines of the first spectrum within the predetermined scale factor band are zero,
if all spectral lines within the predetermined scale factor band are zero, fill the first spectrum within the predetermined scale factor band with noise determined from spectral lines of
a previous frame of the multichannel audio signal, or
a second channel of the current frame of the multichannel audio signal,
to obtain a second spectrum;
scale the second spectrum within each scale factor band, including the predetermined scale factor band, using the scale factor of the respective scale factor band to obtain a third spectrum; and
subject the third spectrum to an inverse transform to acquire a time domain portion of the first channel of the multichannel audio signal.