APPARATUS AND METHOD FOR CONVERTING AN AUDIOSIGNAL INTO A PARAMETERIZED REPRESENTATION, APPARATUS AND METHOD FOR MODIFYING A PARAMETERIZED REPRESENTATION, APPARATUS AND METHOD FOR SYNTHESIZING A PARAMETERIZED REPRESENTATION OF AN AUDIO SIGNAL
First Claim
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;
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;
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.
1 Assignment
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Accused Products
Abstract
Apparatus for converting an audio signal into a parameterized representation, has a signal analyzer for analyzing a portion of the audio signal to obtain an analysis result; 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 has 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; 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.
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Citations
28 Claims
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1. Apparatus for converting an audio signal into a parameterized representation, comprising:
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a signal analyzer for analyzing a portion of the audio signal to acquire an analysis result; 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; 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. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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14. Method of converting an audio signal into a parameterized representation, comprising:
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analyzing a portion of the audio signal to acquire an analysis result; 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; 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 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. - View Dependent Claims (28)
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15. Apparatus for modifying a parameterized representation comprising, for a time portion of an audio signal, band pass filter information for a plurality of band pass filters, the band pass filter information indicating time-varying band pass filter center frequencies of band pass filters comprising band widths, which depend on a band pass filter center frequency of the corresponding band pass filters, and comprising amplitude modulation or phase modulation or frequency modulation information for each band pass filter for the time portion of the audio signal, the modulation information being related to the center frequencies of the band pass filters, the apparatus comprising:
a modifier for modifying the time varying center frequencies or for modifying the amplitude modulation or phase modulation or frequency modulation information and for generating a modified parameterized representation, in which the band widths of the band pass filters depend on the band pass filter center frequencies of the corresponding band pass filters. - View Dependent Claims (16, 17, 18)
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19. Apparatus for modifying a parameterized representation comprising, for a time portion of an audio signal, band pass filter information for a plurality of band pass filters, the band pass filter information indicating time-varying band pass filter center frequencies of band pass filters comprising band widths, which depend on a band pass filter center frequency of the corresponding band pass filters, and comprising amplitude modulation or phase modulation or frequency modulation information for each band pass filter for the time portion of the audio signal, the modulation information being related to the center frequencies of the band pass filters, the apparatus comprising:
modifying the time varying center frequencies or for modifying the amplitude modulation or phase modulation or frequency modulation information and for generating a modified parameterized representation, in which the band widths of the band pass filters depend on the band pass filter center frequencies of the corresponding band pass filters.
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20. Apparatus for synthesizing a parameterized representation of an audio signal comprising a time portion of an audio signal, band pass filter information for a plurality of band pass filters, the band pass filter information indicating time-varying band pass filter center frequencies of band pass filters comprising varying band widths, which depend on a band pass filter center frequency of the corresponding band pass filter, and comprising amplitude modulation or phase modulation or frequency modulation information for each band pass filter for the time portion of the audio signal, comprising:
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an amplitude modulation synthesizer for synthesizing an amplitude modulation component based on the amplitude modulation information; a frequency modulation or phase modulation synthesizer for synthesizing instantaneous frequency of phase information based on the information on a carrier frequency and a frequency modulation information for a respective band width, wherein distances in frequency between adjacent carrier frequencies are different over a frequency spectrum, an oscillator for generating an output signal representing an instantaneously amplitude modulated, frequency modulated or phase modulated oscillation signal for each band pass filter channel; and a combiner for combining signals from the band pass filter channels and for generating an audio output signal based on the signals from the band pass filter channels. - View Dependent Claims (21, 22, 23, 24, 25)
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26. Method of synthesizing a parameterized representation of an audio signal comprising a time portion of an audio signal, band pass filter information for a plurality of band pass filters, the band pass filter information indicating time-varying band pass filter center frequencies of band pass filters comprising varying band widths, which depend on a band pass filter center frequency of the corresponding band pass filter, and comprising amplitude modulation or phase modulation or frequency modulation information for each band pass filter for the time portion of the audio signal, comprising:
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synthesizing an amplitude modulation component based on the amplitude modulation information; synthesizing instantaneous frequency or phase information based on the information on a carrier frequency and a frequency modulation information for a respective band width, wherein distances in frequency between adjacent carrier frequencies are different over a frequency spectrum, generating an output signal representing an instantaneously amplitude modulated, frequency modulated or phase modulated oscillation signal for each band pass filter channel; and combining signals from the band pass filter channels and for generating an audio output signal based on the signals from the band pass filter channels.
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27. Parametric representation for an audio signal, the parametric representation being related to a time portion of an audio signal, band pass filter information for a plurality of band pass filters, the band pass filter information indicating time-varying band pass filter center frequencies of band pass filters comprising varying band widths, which depend on a band pass filter center frequency of the corresponding band pass filter, and comprising amplitude modulation or phase modulation or frequency modulation information for each band pass filter for the time portion of the audio signal.
Specification