Method for reduction of aliasing introduced by spectral envelope adjustment in real-valued filterbanks
First Claim
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1. Apparatus for reducing or eliminating intermodulation introduced by aliasing in a real-valued filterbank used for spectral envelope adjustment, comprising:
- means for analysing an input signal to obtain information; and
means for using the obtained information to restrain envelope adjustment capabilities of the real-valued filterbank by grouping gain-values of adjacent channels.
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Abstract
The present invention proposes a new method for improving the performance of a real-valued filterbank based spectral envelope adjuster. By adaptively locking the gain values for adjacent channels dependent on the sign of the channels, as defined in the application, reduced aliasing is achieved. Furthermore, the grouping of the channels during gain-calculation, gives an improved energy estimate of the real valued subband signals in the filterbank.
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Citations
10 Claims
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1. Apparatus for reducing or eliminating intermodulation introduced by aliasing in a real-valued filterbank used for spectral envelope adjustment, comprising:
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means for analysing an input signal to obtain information; and means for using the obtained information to restrain envelope adjustment capabilities of the real-valued filterbank by grouping gain-values of adjacent channels. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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Specification