FIELD: physics, acoustics.
SUBSTANCE: invention relates to audio processing, particularly to decomposition of audio signals into different components, for example, differently detectable components. An apparatus for decomposing a signal having at least three channels comprises an analyser (16) for analysing a similarity between two channels of an analysed signal related to the signal having at least two analysed channels, wherein the analyser is configured to use a pre-calculated frequency-dependent similarity curve as a reference curve to determine the analysis result. The signal processor (20) processes the analysed signal or a signal derived from the analysed signal or a signal, from which the analysed signal is derived using the analysis result to obtain a decomposed signal.
EFFECT: decomposing a signal using a pre-calculated frequency-dependent similarity curve as a reference curve.
15 cl, 16 dwg
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