US 11,727,944 B2
Apparatus and method for stereo filling in multichannel coding
Sascha Dick, Nuremberg (DE); Christian Helmrich, Berlin (DE); Nikolaus Rettelbach, Nuremberg (DE); Florian Schuh, Zirndorf (DE); Richard Fueg, Nuremberg (DE); and Frederik Nagel, Heroldsberg (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 Jul. 1, 2020, as Appl. No. 16/918,812.
Application 16/918,812 is a continuation of application No. 15/999,260, filed on Aug. 17, 2018, granted, now 10,733,999.
Application 15/999,260 is a continuation of application No. PCT/EP2017/053272, filed on Feb. 14, 2017.
Claims priority of application No. 16156209 (EP), filed on Feb. 17, 2016.
Prior Publication US 2020/0357418 A1, Nov. 12, 2020
This patent is subject to a terminal disclaimer.
Int. Cl. G10L 19/008 (2013.01); G10L 19/028 (2013.01); G10L 19/035 (2013.01)
CPC G10L 19/008 (2013.01) [G10L 19/028 (2013.01); G10L 19/035 (2013.01)] 21 Claims
OG exemplary drawing
 
1. Apparatus for decoding a previous encoded multichannel signal of a previous frame to acquire three or more previous audio output channels, and for decoding a current encoded multichannel signal of a current frame to acquire two or more current audio output channels,
wherein the apparatus comprises an interface, a channel decoder, a multichannel processor for generating the two or more current audio output channels, and a noise filling module,
wherein the channel decoder is adapted to decode the current encoded multichannel signal of the current frame to acquire a set of three or more decoded channels of the current frame,
wherein the multichannel processor is adapted to select a first selected pair of two decoded channels from the set of three or more decoded channels depending on first multichannel parameters of side information,
wherein the multichannel processor is adapted to generate a first group of two or more processed channels based on said first selected pair of two decoded channels to acquire an updated set of three or more decoded channels,
wherein, before the multichannel processor generates the first pair of two or more processed channels based on said first selected pair of two decoded channels, the noise filling module is adapted to identify for at least one of the two channels of said first selected pair of two decoded channels, one or more frequency bands, within which all spectral lines are quantized to zero, and to generate a mixing channel using two or more, but not all of the three or more previous audio output channels, and to fill the spectral lines of the one or more frequency bands, within which all spectral lines are quantized to zero, with noise generated using spectral lines of the mixing channel, wherein the noise filling module is adapted to select the two or more previous audio output channels that are used for generating the mixing channel from the three or more previous audio output channels depending on the side information.