Patent ID: 11871205
Assignee: KONINKLIJKE PHILIPS N.V.
Field: Audio-visual technology (Electrical engineering)
Classification: CPC H  G | IPC G  H

Claim 0:
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:, α
  =
  
   
    iid
    -
    1
    -
    
     j
     ·
     2
     ·
     
      sin
      ⁡
      (
      ipd
      )
     
     ·
     icc
     ·
     
      iid
     
    
   
   
    iid
    +
    1
    +
    
     2
     ·
     
      cos
      ⁡
      (
      ipd
      )
     
     ·
     icc
     ·
     
      iid
     
    
   
  
 

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.