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US 8,379,868 B2Granted
Spatial audio coding based on universal spatial cues
AssigneeCreative Technology Ltd
InventorsMichael Goodwin, Jean-Marc Jot
Life of this patent
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Abstract
The present invention provides a frequency-domain spatial audio coding framework based on the perceived spatial audio scene rather than on the channel content. In one embodiment, time-frequency spatial direction vectors are used as cues to describe the input audio scene.
Claims18
A method of processing an audio input signal, the method comprising:
- receiving an audio input signal;
- deriving using at least one processor spatial cue information from a frequency-domain representation of the audio input signal, wherein the spatial cue information is generated by determining at least one direction vector for an audio event from the frequency-domain representation;
- downmixing the audio input signal;
- and
- synthesizing a set of output signals from the downmixed signal,
- wherein the set of output signals is synthesized by deriving pairwise-panning weights to recreate the appropriate perceived direction indicated by the spatial cue information;
- deriving omnidirectional panning weights that result in a non-directional percept;
- and cross-fading between the pairwise-panning weights and omnidirectional panning weights to achieve the correct spatial location.
5 more elements
A method of synthesizing a multichannel audio signal, the method comprising:
- receiving a downmixed audio signal and spatial cues based on direction vectors, the downmixed audio signal corresponding to a multichannel audio signal;
- deriving using at least one processor a frequency-domain representation for the downmixed audio signal;
- and
- distributing the downmixed audio signal to output channels of a multichannel output signal using the spatial cues,
- wherein the mulitchannel output signal is synthesized from the downmixed audio signal by deriving pairwise-panning weights to recreate the appropriate perceived direction indicated by the spatial cues;
- deriving omnidirectional panning weights that result in a non-directional percept;
- and cross-fading between the pairwise-panning weights and omnidirectional panning weights to achieve the correct spatial location.
4 more elements
Dependencies are inferred from the claim text.