with a7716790 and this bitstream : [p10_st_48k_-stereo_-dtx_32000_48.bit](/uploads/e73dbcc02ec402aa4285dcd2398a1cf4/p10_st_48k_-stereo_-dtx_32000_48.bit) a crash du to saturation is happening at frame 577 in the function ITF_Detect_fx() from the file tns_base.c Ln576. ``` move16(); shift = shifts[iSubdivisions]; n = sub( iEndLine, iStartLine ); assert( n < (Word16) ( sizeof( tmpbuf ) / sizeof( Word16 ) ) ); FOR( i = 0; i < n; i++ ) { -->>> tmpbuf[i] = round_fx( L_shl( pSpectrum[iStartLine + i - IGF_START_MN], shift ) ); move16(); } ``` Replacing with ``` move16(); shift = shifts[iSubdivisions]; n = sub( iEndLine, iStartLine ); assert( n < (Word16) ( sizeof( tmpbuf ) / sizeof( Word16 ) ) ); FOR( i = 0; i < n; i++ ) { tmpbuf[i] = round_fx_sat( L_shl_sat( pSpectrum[iStartLine + i - IGF_START_MN], shift ) ); move16(); } ``` would solve the problem and from the synthesis quality point view seems ok. I will create a MR, but would ask someone from FhG? to confirm it.