Apparatus and method for processing a decoded audio signal in a spectral domain
First Claim
1. Apparatus for processing a decoded audio signal, comprising:
- a filter for filtering the decoded audio signal to acquire a filtered audio signal;
a time-spectral converter stage for converting the decoded audio signal and the filtered audio signal into corresponding spectral representations, each spectral representation comprising a plurality of subband signals;
a weighter for performing a frequency selective weighting of the spectral representation of the filtered audio signal by multiplying subband signals by respective weighting coefficients to acquire a weighted filtered audio signal;
a subtractor for performing a subband-wise subtraction between the weighted filtered audio signal and the spectral representation of the decoded audio signal to acquire a result audio signal; and
a spectral-time converter for converting the result audio signal or a signal derived from the result audio signal into a time domain representation to acquire a processed decoded audio signal.
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Abstract
An apparatus for processing a decoded audio signal including a filter for filtering the decoded audio signal to obtain a filtered audio signal, a time-spectral converter stage for converting the decoded audio signal and the filtered audio signal into corresponding spectral representations, each spectral representation having a plurality of subband signals, a weighter for performing a frequency selective weighting of the filtered audio signal by a multiplying subband signals by respective weighting coefficients to obtain a weighted filtered audio signal, a subtractor for performing a subband-wise subtraction between the weighted filtered audio signal and the spectral representation of the decoded audio signal, and a spectral-time converter for converting the result audio signal or a signal derived from the result audio signal into a time domain representation to obtain a processed decoded audio signal.
164 Citations
16 Claims
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1. Apparatus for processing a decoded audio signal, comprising:
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a filter for filtering the decoded audio signal to acquire a filtered audio signal; a time-spectral converter stage for converting the decoded audio signal and the filtered audio signal into corresponding spectral representations, each spectral representation comprising a plurality of subband signals; a weighter for performing a frequency selective weighting of the spectral representation of the filtered audio signal by multiplying subband signals by respective weighting coefficients to acquire a weighted filtered audio signal; a subtractor for performing a subband-wise subtraction between the weighted filtered audio signal and the spectral representation of the decoded audio signal to acquire a result audio signal; and a spectral-time converter for converting the result audio signal or a signal derived from the result audio signal into a time domain representation to acquire a processed decoded audio signal. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
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15. Method of processing a decoded audio signal, comprising:
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filtering the decoded audio signal to acquire a filtered audio signal; converting the decoded audio signal and the filtered audio signal into corresponding spectral representations, each spectral representation comprising a plurality of subband signals; performing a frequency selective weighting of the filtered audio signal by multiplying subband signals by respective weighting coefficients to acquire a weighted filtered audio signal; performing a subband-wise subtraction between the weighted filtered audio signal and the spectral representation of the decoded audio signal to acquire a result audio signal; and converting the result audio signal or a signal derived from the result audio signal into a time domain representation to acquire a processed decoded audio signal. - View Dependent Claims (16)
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Specification