question: private static void sbrQmfSynthesis ( FFT mdct , float out [ ] , float X [ ] [ ] [ ] , float mdctBuf [ ] , float v0 [ ] , int vOff [ ] , final int div ) { final float sbrQmfWindow [ ] = div != 0 ? sbr_qmf_window_ds : sbr_qmf_window_us ; final int step = 128 > > div ; int v ; int outOffset = 0 ; for ( int i = 0 ; i < 32 ; i ++ ) { if ( vOff [ 0 ] < step ) { int saved_samples = ( 1280 - 128 ) > > div ; System . arraycopy ( v0 , 0 , v0 , SBR_SYNTHESIS_BUF_SIZE - saved_samples , saved_samples ) ; vOff [ 0 ] = SBR_SYNTHESIS_BUF_SIZE - saved_samples - step ; } else { vOff [ 0 ] -= step ; } v = vOff [ 0 ] ; if ( div != 0 ) { for ( int n = 0 ; n < 32 ; n ++ ) { X [ 0 ] [ i ] [ n ] = - X [ 0 ] [ i ] [ n ] ; X [ 0 ] [ i ] [ 32 + n ] = X [ 1 ] [ i ] [ 31 - n ] ; } mdct . imdctHalf ( mdctBuf , 0 , X [ 0 ] [ i ] , 0 ) ; SBRDSP . qmfDeintNeg ( v0 , v , mdctBuf , 0 ) ; } else { SBRDSP . negOdd64 ( X [ 1 ] [ i ] , 0 ) ; mdct . imdctHalf ( mdctBuf , 0 , X [ 0 ] [ i ] , 0 ) ; mdct . imdctHalf ( mdctBuf , 64 , X [ 1 ] [ i ] , 0 ) ; SBRDSP . qmfDeintBfly ( v0 , v , mdctBuf , 64 , mdctBuf , 0 ) ; } FloatDSP . vectorFmul ( out , outOffset , v0 , v , sbrQmfWindow , ( 0 ) , 64 > > div ) ; FloatDSP . vectorFmulAdd ( out , outOffset , v0 , v + ( 192 > > div ) , sbrQmfWindow , ( 64 > > div ) , out , outOffset , 64 > > div ) ; FloatDSP . vectorFmulAdd ( out , outOffset , v0 , v + ( 256 > > div ) , sbrQmfWindow , ( 128 > > div ) , out , outOffset , 64 > > div ) ; FloatDSP . vectorFmulAdd ( out , outOffset , v0 , v + ( 448 > > div ) , sbrQmfWindow , ( 192 > > div ) , out , outOffset , 64 > > div ) ; FloatDSP . vectorFmulAdd ( out , outOffset , v0 , v + ( 512 > > div ) , sbrQmfWindow , ( 256 > > div ) , out , outOffset , 64 > > div ) ; FloatDSP . vectorFmulAdd ( out , outOffset , v0 , v + ( 704 > > div ) , sbrQmfWindow , ( 320 > > div ) , out , outOffset , 64 > > div ) ; FloatDSP . vectorFmulAdd ( out , outOffset , v0 , v + ( 768 > > div ) , sbrQmfWindow , ( 384 > > div ) , out , outOffset , 64 > > div ) ; FloatDSP . vectorFmulAdd ( out , outOffset , v0 , v + ( 960 > > div ) , sbrQmfWindow , ( 448 > > div ) , out , outOffset , 64 > > div ) ; FloatDSP . vectorFmulAdd ( out , outOffset , v0 , v + ( 1024 > > div ) , sbrQmfWindow , ( 512 > > div ) , out , outOffset , 64 > > div ) ; FloatDSP . vectorFmulAdd ( out , outOffset , v0 , v + ( 1216 > > div ) , sbrQmfWindow , ( 576 > > div ) , out , outOffset , 64 > > div ) ; outOffset += 64 > > div ; } }
target:  Synthesis QMF Bank (14496-3 sp04 p206) and Downsampled Synthesis QMF Bank (14496-3 sp04 p206)