Patent ID: 11869519
Assignee: FRAUNHOFER GESELLSCHAFT ZUR FÖRDERUNG DER ANGEWANDTEN FORSCHUNG E.V.
Field: Computer technology (Electrical engineering)
Classification: CPC G  H | IPC G  H

Claim 0:
1. An apparatus for decomposing an audio signal into a background component signal and a foreground component signal, the apparatus comprising:
a block generator for generating a time sequence of blocks of audio signal values of the audio signal, the time sequence of blocks comprising a current block of audio signal values and at least two blocks of audio signal values;
an audio signal analyzer configured for determining a characteristic of the current block of the time sequence of blocks, and configured for determining a variability of the characteristic within a group of blocks comprising the at least two blocks of the time sequence of blocks; and
a separator for separating the current block into a background portion and a foreground portion or to determine the whole current block as either the foreground component signal or the background component signal, wherein the separator is configured to:
determine a separation threshold based on the variability of the characteristic, and
separate the current block into the background component signal and the foreground component signal, when the characteristic of the current block is in a predetermined relation to the separation threshold determined based on the variability of the characteristic, or
determine the whole current block as the foreground component signal, when the characteristic of the current block is in the predetermined relation to the separation threshold determined based on the variability of the characteristic, or
determine the whole current block as the background component signal, when the characteristic of the current block is not in the predetermined relation to the separation threshold determined based on the variability of the characteristic.