US 11,895,468 B2
System and method for synchronization of multi-channel wireless audio streams for delay and drift compensation
Hussnain Ali, Frisco, TX (US); Srinath Arunachalam, Dallas, TX (US); and Kadagattur Gopinatha Srinidhi, Novi, MI (US)
Assigned to Harman International Industries, Incorporated, Stamford, CT (US)
Filed by HARMAN INTERNATIONAL INDUSTRIES, INCORPORATED, Stamford, CT (US)
Filed on Jan. 31, 2022, as Appl. No. 17/589,224.
Prior Publication US 2023/0247353 A1, Aug. 3, 2023
Int. Cl. H04R 3/00 (2006.01); H04R 3/04 (2006.01); H04S 5/00 (2006.01); H04R 5/04 (2006.01)
CPC H04R 3/00 (2013.01) [H04R 5/04 (2013.01); H04S 5/00 (2013.01); H04R 2420/07 (2013.01); H04S 2400/01 (2013.01)] 20 Claims
OG exemplary drawing
 
1. A system for synchronizing an audio stream, the system comprising:
a first loudspeaker configured to playback a first audio output signal including first audio packets and first signature information in response to a first audio input signal; and
an audio controller programmed to:
provide the first audio input signal;
superimpose the first signature information on the first audio input signal prior to the first loudspeaker playing back the first audio output signal;
receive the first audio output signal including the first audio packets and the first signature information;
detect the first signature information on the first audio output signal;
determine a delay attributed to a transmission of the first audio input signal and the first audio output signal based on the first signature information; and
synchronize the transmission of a second audio input signal from the audio controller to the first loudspeaker such that the playback of a second audio output signal from the first loudspeaker is synchronized with the playback of another audio output signal from a second loudspeaker based at least on the delay.