Patent ID: 8793123
Filing Date: 2014-07-29
Classification: G10L

Abstract:
1. Apparatus for converting an audio signal into a parameterized representation, comprising: a signal analyzer for analyzing a portion of the audio signal to acquire an analysis result, wherein the signal analyzer is operative to calculate a center of gravity position function for a spectral representation of the portion of the audio signal, wherein predetermined events in the center of gravity position function indicate candidate values for center frequencies of the plurality of band pass filters; a band pass estimator for estimating information of a plurality of band pass filters based on the analysis result, wherein the information on the plurality of band pass filters comprises information on a filter shape for the portion of the audio signal, wherein the band width of a band pass filter is different over an audio spectrum and depends on the center frequency of the band pass filter, wherein the band pass estimator is operative to determine the center frequencies based on the candidate values; a modulation estimator for estimating an amplitude modulation or a frequency modulation or a phase modulation for each band of the plurality of band pass filters for the portion of the audio signal using the information on the plurality of band pass filters; and an output interface for transmitting, storing or modifying information on the amplitude modulation, information on the frequency modulation or phase modulation or the information on the plurality of band pass filters for the portion of the audio signal.