APPARATUS AND METHOD FOR DECOMPOSING AN AUDIO SIGNAL USING A RATIO AS A SEPARATION CHARACTERISTIC.

摘要

An apparatus for decomposing an audio signal (100) into a background component signal (140) and a foreground component signal (150), comprises: a block generator (110) for generating a time sequence of blocks of audio signal values; an audio signal analyzer (120) for determining a block characteristic of a current block of the audio signal and for determining an average characteristic for a group of blocks, the group of blocks comprising at least two blocks; and a separator (130) for separating the current block into a background portion and a foreground portion in response to a ratio of the block characteristic of the current block and the average characteristic of the group of blocks, wherein the background component signal (140) comprises the background portion of the current block and the foreground component signal (150) comprises the foreground portion of the current block.