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US 8,619,998 B2Granted
Spatial audio enhancement processing method and apparatus
AssigneeCreative Technology Ltd
InventorsMartin Walsh, Jean Marc Jot, Edward Stein
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Abstract
The present invention describes techniques that can be used to provide novel methods of spatial audio rendering using adapted M-S matrix shuffler topologies. Such techniques include headphone and loudspeaker-based binaural signal simulation and rendering, stereo expansion, multichannel upmix and pseudo multichannel surround rendering.
Claims17
A method performed by a processor of processing an audio signal having at least two channels, comprising:
- generating a sum signal and a difference signal from the audio signal;
- applying a first filter to the sum signal;
- applying a second filter to the difference signal;
- and applying a crossfade to each of the sum signal and the difference signal, the crossfade blending an output of the first filter with a bypass of the first filter and blending an output of the second filter with a bypass of the second filter to control the amount of the resulting audio signal effect by respectively scaling the sum signal and the difference signal.
1 more element
A method performed by a processor of processing a single channel audio signal, comprising:
- deriving a synthetic difference from the input single channel audio signal;
- applying a first filter to ( ) a sum signal represented by the single channel signal;
- applying a second filter to the synthetic difference signal;
- and ;
- and applying a crossfade to each of the sum signal and the synthetic difference signal, the crossfade blending an output of the first filter with a bypass of the first filter and blending an output of the second filter with a bypass of the second filter to control the amount of the resulting audio signal effect by respectively scaling the sum signal and the synthetic difference signal.
2 more elements
Dependencies are inferred from the claim text.