Patent ID: 11929089
Assignee: FRAUNHOFER GESELLSCHAFT ZUR FÖRDERUNG DER ANGEWANDTEN FORSCHUNG E.V.
Field: Computer technology (Electrical engineering)
Classification: CPC G | IPC G

Claim 29:
30. A non-transitory digital storage medium having a computer program stored thereon to perform, when said computer program is run by a computer, the method for processing a multichannel audio signal comprising a plurality of channel signals, said method comprising:
calculating a sum signal of the two channel signals of the plurality of channel signals and calculating a difference signal from a difference of the two channel signals of the plurality of channel signals, wherein a first channel signal of the two channel signals has a first amplitude or magnitude and a first phase, and wherein a second channel signal of the two channel signals has a second amplitude or magnitude and a second phase;
performing a time scale modification of the multichannel audio signal, the time scale modification comprising modifying a phase of the sum signal of the two channel signals of the plurality of channel signals to obtain at least one processed signal,
by applying a phase locking to the sum signal of the two channel signals of the plurality of channel signals to obtain the at least one processed signal, or
by obtaining the at least one processed signal, in which a horizontal phase coherence is maintained, and
providing two separated signals based on the at least one processed signal and the difference signal or a processed difference signal, wherein providing the separated signals comprises reversing a combination of the channel signals of the plurality of channel signals, applied by the providing the sum signal and the difference signal, wherein a first separated signal of the two separated signals has a first separated amplitude or magnitude and a first separated phase, and wherein a second separated signal of the two separated signals has a second separated amplitude or magnitude and a second separated phase; and
modifying the first separated signal by replacing the first separated amplitude or magnitude by the first amplitude or magnitude to obtain a corrected first separated signal, so that the corrected first separated signal comprises the first amplitude or magnitude and the first separated phase, and modifying the second separated signal by replacing the second separated amplitude or magnitude by the second amplitude or magnitude to obtain a corrected second separated signal, so that the corrected second separated signal comprises the second amplitude or magnitude and the second separated phase, wherein the corrected first separated signal and the corrected second separated signal represent a time scale modified version of the multichannel audio signal.