APPARATUS AND METHOD FOR DETERMINING A PLURALITY OF LOCAL CENTER OF GRAVITY FREQUENCIES OF A SPECTRUM OF AN AUDIO SIGNAL

摘要

An apparatus for determining a plurality of local center of gravity frequencies of a spectrum of an audio signal comprises an offset determiner, a frequency determiner and an iteration controller. The offset determiner determines an offset frequency for each iteration start frequency of a plurality of iteration start frequencies based on the spectrum of the audio signal, wherein a number of discrete sample values of the spectrum is larger than a number of iteration start frequencies. The frequency determiner determines a new plurality of iteration start frequencies by increasing or reducing each iteration start frequency of the plurality of iteration start frequencies by the corresponding determined offset frequency. The iteration controller provides the new plurality of iteration start frequencies to the offset determiner for further iteration or provides the plurality of local center of gravity frequencies, if a predefined termination condition is fulfilled. The plurality of local center of gravity frequencies can be utilized as a basis for generating a new plurality of iteration start frequencies.