Method for processing an audio signal, signal processing unit, binaural renderer, audio encoder and audio decoder
AssigneeFraunhofer-Gesellschaft zur Foerderung der angewandten Forschung e.V.
InventorsSimone Neukam, Jan Plogsties
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Abstract
A method for processing an audio signal in accordance with a room impulse response is described. The audio signal is processed with an early part of the room impulse response separate from a late reverberation of the room impulse response, wherein the processing of the late reverberation has generating a scaled reverberated signal, the scaling being dependent on the audio signal. The processed early part of the audio signal and the scaled reverberated signal are combined.
Claims20
A method for processing an audio signal in accordance with a room impulse response, the method comprising:
- applying the audio signal as an input signal to an early part processor and to a late reverberation processor;
- receiving, by the early part processor, a direct sound and early reflections of the room impulse response and processing the audio signal using the direct sound and early reflections to obtain a processed audio signal;
- receiving, by the late reverberation processor, predefined reverberator parameters and processing the audio signal using the predefined reverberator parameters to obtain a reverberated signal;
- wherein processing the audio signal by the late reverberation processor comprises a scaling to obtain a scaled reverberated signal;
- and
- combining the processed audio signal and the scaled reverberated signal,
- wherein the scaling comprises:
- setting a gain factor according to a predefined correlation measure of the audio signal, the predefined correlation measure having a fixed value determined empirically on the basis of an analysis of a plurality of audio signals, and applying the gain factor, or
- obtaining a gain factor using a correlation analysis of the audio signal, and
- applying the gain factor.
A signal processing unit, comprising:
- an input for receiving an audio signal,
- an early part processor receiving a direct sound and early reflections of the room impulse response and processing the audio signal using the direct sound and early reflections to obtain a processed audio signal,
- a late reverberation processor receiving as input signal the audio signal, wherein the late reverberation processor is to receive predefined reverberator parameters and to process the audio signal using the predefined reverberator parameters to obtain a reverberated signal and to scale the reverberated signal to obtain a scaled reverberated signal;
- and
- an output for combining the processed audio signal and the scaled reverberated signal into an output audio signal,
- wherein processing the audio signal by the late reverberation processor comprises a scaling to obtain a scaled reverberated signal, and
- wherein the scaling comprises:
- setting a gain factor according to a predefined correlation measure of the audio signal, the predefined correlation measure having a fixed value determined empirically on the basis of an analysis of a plurality of audio signals, and applying the gain factor, or
- obtaining a gain factor using a correlation analysis of the audio signal, and applying the gain factor.
Dependencies are inferred from the claim text.