US 12,363,478 B2
Method and system for improving the restitution of low frequencies of an audio signal
Nicolas Lopez Zuleta, Montreuil (FR); Jérôme Noirot, Paris (FR); and Jacquemin Vidal, Leuville sur Orge (FR)
Assigned to Faurecia Clarion Electronics Europe, Paris (FR)
Filed by Faurecia Clarion Electronics Europe, Paris (FR)
Filed on Feb. 27, 2023, as Appl. No. 18/114,982.
Claims priority of application No. 22 01730 (FR), filed on Feb. 28, 2022.
Prior Publication US 2023/0276172 A1, Aug. 31, 2023
Int. Cl. H04R 3/04 (2006.01)
CPC H04R 3/04 (2013.01) 14 Claims
OG exemplary drawing
 
1. A method of improving the low-frequency sound rendering of an audio signal, the sound rendering being performed by an audio system comprising at least one loudspeaker, the method comprising:
separating an input audio signal by filtering the audio input into a high-frequency signal and a low-frequency signal,
generating a low-frequency output signal by a first processing of the low-frequency signal;
generating a high-frequency output signal by a second processing of the high-frequency signal; and
generating an output audio signal based on a summation of the low-frequency output signal and the high-frequency output signal, the output audio signal being supplied as input to a set of audio processing blocks of the audio system,
wherein the first processing of the low-frequency signal comprises adjusting the dynamic range of the low-frequency signal as a function of at least one transient part of said low-frequency signal,
wherein generating the output audio signal further comprises performing an analysis of the low-frequency signal, said analysis comprising a calculation of a level of the at least one transient part of the low-frequency signal, and wherein adjusting the dynamic range of the low-frequency signal further comprises adjusting at least one parameter of a dynamic range enhancement module that adjusts the dynamics of the low-frequency signal as a function of the calculated level; and
wherein the at least one adjusted parameter comprises a dynamic range slope, said slope being calculated as a function of said low-frequency signal level, a first slope value to be applied for predetermined first low level audio signals, and a second slope value to be applied for predetermined second high level audio signals.