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US 2019/0058960 A1Published application
Parametric stereo upmix apparatus, a parametric stereo decoder, a parametric stereo downmix apparatus, a parametric stereo encoder
AssigneeKoninklijke Philips N.V.
InventorERIK GOSUINUS PETRUS SCHUIJERS
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Abstract
A parametric stereo upmix method for generating a left signal and a right signal from a mono downmix signal based on spatial parameters includes predicting a difference signal comprising a difference between the left signal and the right signal based on the mono downmix signal scaled with a prediction coefficient. The prediction coefficient is derived from the spatial parameters. The method further includes deriving the left signal and the right signal based on a sum and a difference of the mono downmix signal and said difference signal.
Claims3
A method for decoding comprising acts of:
- splitting by de-multiplexer an input bitstream into a mono bitstream and a parameter bitstream and extracting a prediction residual bitstream from the input bitstream;
- decoding by a mono decoder the mono bitstream into a mono downmix signal and decoding a prediction residual signal for a difference signal from the prediction residual bitstream;
- decoding by a parameter decoder a parameter bitstream into spatial parameters;
- generating by a parametric stereo upmixer a left signal and a right signal from the mono downmix signal based on the spatial parameters;
- predicting the difference signal comprising a difference between the left signal and the right signal based on the mono downmix signal scaled with a prediction coefficient, wherein said prediction coefficient is derived from the spatial parameters;
- and
- forming the left signal and the right signal based on a sum and a difference of the mono downmix signal, said difference signal, and said prediction residual signal for the difference signal.
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