US 12,245,013 B2
Methods and apparatus for decoding encoded HOA signals
Sven Kordon, Wunstorf (DE); and Alexander Krueger, Burgdorf (DE)
Assigned to Dolby Laboratories Licensing Corporation, San Francisco, CA (US)
Filed by Dolby Laboratories Licensing Corporation, San Francisco, CA (US)
Filed on Nov. 22, 2023, as Appl. No. 18/517,301.
Application 17/099,120 is a division of application No. 16/525,074, filed on Jul. 29, 2019, granted, now 10,841,721, issued on Nov. 17, 2020.
Application 16/525,074 is a division of application No. 15/790,375, filed on Oct. 23, 2017, granted, now 10,382,876, issued on Aug. 13, 2019.
Application 15/790,375 is a division of application No. 15/588,320, filed on May 5, 2017, granted, now 9,900,721, issued on Feb. 20, 2018.
Application 18/517,301 is a continuation of application No. 18/081,956, filed on Dec. 15, 2022, granted, now 11,863,958.
Application 18/081,956 is a continuation of application No. 17/711,029, filed on Apr. 1, 2022, granted, now 11,540,076, issued on Dec. 27, 2022.
Application 17/711,029 is a continuation of application No. 17/099,120, filed on Nov. 16, 2020, granted, now 11,297,455, issued on Apr. 5, 2022.
Application 15/588,320 is a continuation of application No. 14/904,406, granted, now 9,668,079, issued on May 30, 2017, previously published as PCT/EP2014/063306, filed on Jun. 24, 2014.
Claims priority of application No. 13305986 (EP), filed on Jul. 11, 2013.
Prior Publication US 2024/0171924 A1, May 23, 2024
This patent is subject to a terminal disclaimer.
Int. Cl. H04S 3/02 (2006.01); G10L 19/008 (2013.01); H04S 3/00 (2006.01)
CPC H04S 3/008 (2013.01) [G10L 19/008 (2013.01); H04S 2420/11 (2013.01)] 3 Claims
OG exemplary drawing
 
1. A method for decoding an HOA representation, said decoding comprising:
transforming a vector of PCM encoded spatial domain signals of the HOA representation to a corresponding vector of coefficient domain signals;
de-normalizing a vector of PCM encoded and normalized coefficient domain signals of the HOA representation, wherein the de-normalizing comprises:
determining a transition vector based on a corresponding exponent of side information and a recursively computed gain value, wherein the corresponding exponent and the gain value are based on a running index of an input matrix of HOA signal vectors;
applying a corresponding inverse gain value to the vector of PCM encoded and normalized coefficient domain signals in order to determine a corresponding vector of PCM-coded and de-normalized signal; and
combining the vector of coefficient domain signals and a vector of de-normalized coefficient domain signals to determine a combined vector of HOA coefficient domain signals that can have a variable number of HOA coefficients.
 
2. An apparatus for decoding an HOA representation, the apparatus comprising:
a first processing unit for transforming a vector of PCM encoded spatial domain signals of the HOA representation to a corresponding vector of coefficient domain signals;
a second processing unit for de-normalizing vector of PCM encoded and normalized coefficient domain signals of HOA representation, wherein the second processing unit is adapted for:
determining a transition vector based on a corresponding exponent of side information and a recursively computed gain value, wherein the corresponding exponent and the gain value are based on a running index of an input matrix of HOA signal vectors;
applying a corresponding inverse gain value to vector of PCM encoded and normalized coefficient domain signals in order to determine a corresponding vector of PCM-coded and de-normalized signal; and
a combiner for combining the vector of coefficient domain signals and a vector of de-normalized coefficient domain signals to determine a combined vector of HOA coefficient domain signals that can have a variable number of HOA coefficients.