Envelope shaping of decorrelated signals
AssigneesCoding Technologies AB, Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V.
InventorsKristofer Kjorling, Jurgen Herre, Sascha Disch, Lars Villemoes
Life of this patent
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Abstract
The envelope of a decorrelated signal derived from an original signal can be shaped without introducing additional distortion, when a spectral flattener is used to spectrally flatten the spectrum of the decorrelated signal and the original signal prior to using the flattened spectra for deriving a gain factor describing the energy distribution between the flattened spectra, and when the so derived gain factor is used by an envelope shaper to timely shape the envelope of the decorrelated signal.
Claims19
Apparatus for processing a decorrelated signal derived from an original signal or a combination signal derived by combining the original signal and the decorrelated signal, comprising:
- a spectral flattener for spectral flattening of the decorrelated signal, a signal derived from the decorrelated signal, the original signal, a signal derived from the original signal or the combination signal to obtain a flattened signal, the spectral flattener being operative such that the flattened signal has a flatter spectrum than a corresponding signal before flattening;
- and
- a time envelope shaper for time envelope shaping the decorrelated signal or the combination signal using information on the flattened signal.
Method for processing a decorrelated signal derived from an original signal or a combination signal derived by combining the original signal and the decorrelated signal, the method comprising:
- spectrally flattening the decorrelated signal, a signal derived from the decorrelated signal, the original signal, a signal derived from the original signal or the combination signal to obtain a flattened signal, the flattened signal having a flatter spectrum than a corresponding signal before flattening;
- and
- time envelope shaping the decorrelated signal or the combination signal using information on the flattened signal.
Spatial audio decoder, comprising:
- an input interface for receiving an original signal derived from a multi channel signal having at least two channels and for receiving spatial parameters describing an interrelation between a first channel and a second channel of the multi channel signal;
- a decorrelator for deriving a decorrelated signal from the original signal using the spatial parameters;
- a spectral flattener for spectral flattening of the decorrelated signal, a signal derived from the decorrelated signal, the original signal, a signal derived from the original signal or a combination signal derived by combining the original signal and the decorrelated signal to obtain a flattened signal, the spectral flattener being operative such that the flattened signal has a flatter spectrum than a corresponding signal before flattening;
- and
- a time envelope shaper for time envelope shaping the decorrelated signal or the combination signal using information on the flattened signal.
Receiver or audio player, having an apparatus for processing a decorrelated signal derived from an original signal or a combination signal derived by combining the original signal and the decorrelated signal, comprising:
- a spectral flattener for spectral flattening of the decorrelated signal, a signal derived from the decorrelated signal, the original signal, a signal derived from the original signal or the combination signal to obtain a flattened signal, the spectral flattener being operative such that the flattened signal has a flatter spectrum than a corresponding signal before flattening;
- and
- a time envelope shaper for time envelope shaping the decorrelated signal or the combination signal using information on the flattened signal.
Method of receiving or audio playing, the method having a method for processing a decorrelated signal derived from an original signal or a combination signal derived by combining the original signal and the decorrelated signal, the method comprising:
- spectrally flattening the decorrelated signal, a signal derived from the decorrelated signal, the original signal, a signal derived from the original signal or the combination signal to obtain a flattened signal, the flattened signal having a flatter spectrum than a corresponding signal before flattening:
- and
- time envelope shaping the decorrelated signal or the combination signal using information on the flattened signal.
Dependencies are inferred from the claim text.