US 12,464,303 B2
Apparatus and method for providing individual sound zones
Martin Schneider, Erlangen (DE); Stefan Wetzel, Bubenreuth (DE); Andreas Walther, Feucht (DE); Christian Uhle, Ursensollen (DE); Oliver Hellmuth, Buckenhof (DE); Peter Prokein, Erlangen (DE); and Emanuel Habets, Spardorf (DE)
Assigned to FRAUNHOFER-GESELLSCHAFT ZUR FÖRDERUNG DER ANGEWANDTEN FORSCHUNG E.V., Munich (DE)
Filed by Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V., Munich (DE)
Filed on Oct. 11, 2018, as Appl. No. 16/157,827.
Application 16/157,827 is a continuation of application No. PCT/EP2017/058611, filed on Apr. 11, 2017.
Claims priority of application No. 16164984 (EP), filed on Apr. 12, 2016.
Prior Publication US 2019/0045316 A1, Feb. 7, 2019
Int. Cl. H04S 7/00 (2006.01); H04S 3/00 (2006.01)
CPC H04S 7/30 (2013.01) [H04S 3/008 (2013.01); H04R 2499/13 (2013.01); H04S 2400/13 (2013.01); H04S 2400/15 (2013.01); H04S 2420/11 (2013.01); H04S 2420/13 (2013.01)] 15 Claims
OG exemplary drawing
 
14. A method for generating a plurality of loudspeaker signals from two or more audio source signals, wherein modifying each initial audio signal of two or more initial audio signals is conducted depending on a signal power or a loudness of another initial audio signal of the two or more initial audio signals; wherein each of the two or more audio source signals shall be reproduced in one or more sound zones of at least two sound zones, and wherein each of the two or more audio source signals shall not be reproduced in any other sound zone of the at least two sound zones, wherein the method comprises:
generating two or more preprocessed audio signals by modifying each of the two or more initial audio signals, wherein the two or more initial audio signals are two or more audio source signals, or wherein the two or more initial audio signals are derived from the two or more audio source signals; and
generating the plurality of loudspeaker signals depending on the two or more preprocessed audio signals, and depending on in which of the at least two sound zones the two or more audio source signals shall be reproduced;
wherein generating the plurality of loudspeaker signals is conducted depending on in which of the at least two sound zones the two or more audio source signals shall not be reproduced;
wherein for each audio source signal of the two or more audio source signals, said audio source signal is to be reproduced in the one or more sound zones of the at least two sound zones, such that said audio source signal is to not be reproduced in at least another sound zone of the at least two sound zones;
wherein modifying an initial audio signal of the two or more initial audio signals is conducted by determining a gain g′1(k) for said initial audio signal and by applying the gain g′1(k) on said initial audio signal,
wherein determining the gain g′1(k) is conducted according to

OG Complex Work Unit Math
or according to

OG Complex Work Unit Math
wherein k is a time index, wherein T1 indicates a first threshold value and T2 indicates a second threshold value, wherein e1(k) indicates a signal power or a loudness of said initial audio signal, wherein N indicates a number of the two or more initial audio signals, wherein ei(k) indicates a signal power or a loudness of a further initial audio signal of the two or more initial audio signals, and wherein R indicates a number, with 1≤R≤100; or
wherein modifying each initial audio signal of the two or more initial audio signals is conducted depending on the signal power or the loudness of another initial audio signal of the two or more initial audio signals by determining a gain g′1(k) for said initial audio signal and by applying the gain g′1(k) on said initial audio signal,
wherein determining the gain g′1(k) is conducted according to

OG Complex Work Unit Math
or according to

OG Complex Work Unit Math
wherein k is a time index, wherein T1 indicates a first threshold value and T2 indicates a second threshold value, wherein e1(k) indicates a signal power or a loudness of said initial audio signal, wherein e2(k) indicates a signal power or a loudness of said another initial audio signal of the two or more initial audio signals, and wherein R indicates a number, with 1≤R≤100.