US 11,871,205 B2
Parametric stereo upmix apparatus, a parametric stereo decoder, a parametric stereo downmix apparatus, a parametric stereo encoder
Erik G. P. Schuijers, Breda (NL)
Assigned to Koninklijke Philips N.V., Eindhoven (NL)
Filed by KONINKLIJKE PHILIPS N.V., Eindhoven (NL)
Filed on May 19, 2021, as Appl. No. 17/324,420.
Application 16/166,496 is a division of application No. 15/411,127, filed on Jan. 20, 2017, granted, now 10,136,237.
Application 15/411,127 is a division of application No. 14/330,498, filed on Jul. 14, 2014, granted, now 9,591,425.
Application 14/330,498 is a division of application No. 12/992,317, granted, now 8,811,621, previously published as PCT/IB2009/005009, filed on May 14, 2009.
Application 17/324,420 is a continuation of application No. 16/166,496, filed on Oct. 22, 2018, granted, now 11,019,445.
Claims priority of application No. 08156801 (EP), filed on May 23, 2008.
Prior Publication US 2021/0274302 A1, Sep. 2, 2021
Int. Cl. H04S 5/00 (2006.01); G10L 19/008 (2013.01); H04S 3/02 (2006.01)
CPC H04S 5/00 (2013.01) [G10L 19/008 (2013.01); H04S 3/02 (2013.01); H04S 2400/03 (2013.01); H04S 2420/03 (2013.01)] 20 Claims
OG exemplary drawing
 
1. A method, comprising:
splitting an input bitstream into a mono bitstream and a parameter bitstream;
decoding the mono bitstream into a mono downmix signal;
decoding the parameter bitstream into spatial parameters;
scaling the mono downmix signal with a prediction coefficient (α) to produce a scaled mono downmix signal;
predicting a first difference signal, wherein the predicting is based on the scaled mono downmix signal;
adding a scaled decorrelated mono downmix signal to the first difference signal to form a second difference signal, wherein the scaled decorrelated mono downmix signal is formed by scaling a decorrelated mono downmix signal by a scaling factor (β);
forming the left signal based on a sum of the mono downmix signal and the second difference signal; and
forming the right signal based on a difference between the mono downmix signal and the second difference signal,
wherein the prediction coefficient (α) is:

OG Complex Work Unit Math
wherein iid, ipd, and icc are the spatial parameters,
wherein iid is an interchannel intensity difference,
wherein ipd is an interchannel phase difference,
wherein icc is an interchannel coherence.