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

Claim 14:
15. A method, comprising: splitting an input bitstream into a mono bitstream and a parameter bitstream, wherein the input bitstream comprises a plurality of subbands; extracting a prediction residual bitstream from the input bitstream, wherein the prediction residual bitstream comprises a third portion of plurality of subbands; decoding the mono bitstream into a mono downmix signal, wherein the mono downmix signal comprises mono downmix subband signals, wherein the mono downmix signals comprises a fourth portion of the plurality of subbands; decoding a prediction residual signal, wherein the prediction residual signal comprises prediction residual subband signals, wherein the prediction residual subband signals comprises a fifth portion of the third portion of plurality of subbands; decoding the parameter bitstream into spatial parameters for at least one subband of the plurality of subbands; scaling the mono downmix subband signal with a prediction coefficient (α) to produce a scaled mono downmix subband signal for at least one subband of the plurality of subbands; predicting a first difference subband signal for at least one subband of the plurality of subbands, wherein the predicting is based on the scaled mono downmix subband signal; adding a scaled decorrelated mono downmix subband signal to the first difference subband signal for at least one subband of the plurality of subbands to form a second difference subband signal, wherein the scaled decorrelated mono downmix subband signal is formed by scaling a decorrelated mono downmix subband signal by a scaling factor (β); forming a first portion of the left signal, wherein the first portion of the left signal comprises one or more subbands, wherein each subband is based on a sum of the mono downmix subband signal, the first difference subband signal, and the prediction residual subband signal; forming a second portion of the left signal, wherein the second portion of the left signal comprises one or more subbands, wherein each subband is based on a sum of the mono downmix subband signal and the second difference subband signal; forming a first portion of the right signal, wherein the first portion of the right signal comprises one or more subbands, wherein each subband is based on a difference between the mono downmix subband signal, and a sum of the first difference subband signal and the prediction residual subband signal; and forming a second portion of the right signal, wherein the second portion of the right signal comprises one or more subbands, wherein each subband is based on a difference between the mono downmix subband signal and the second difference subband 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.