diff --git a/lib_dec/ivas_tcx_core_dec.c b/lib_dec/ivas_tcx_core_dec.c
index 4ac2bc81442362958a6fa71c1de96bc05257a7be..25d6b9fea8cf9d3d21edecd7607ad31e5b73c4e6 100644
--- a/lib_dec/ivas_tcx_core_dec.c
+++ b/lib_dec/ivas_tcx_core_dec.c
@@ -316,7 +316,7 @@ void stereo_tcx_core_dec_fx(
     Word32 L_tmp, mod;
 
     /*LPC*/
-    Word16 lsf_fx[( NB_DIV + 1 ) * M], lsp_fx[( NB_DIV + 1 ) * M], lspmid_fx[M], lsfmid_fx[M];
+    Word16 lsf_fx[( NB_DIV + 1 ) * M], lsp_fx[( NB_DIV + 1 ) * M], lspmid_fx[M], lsfmid_fx[M], lsf_tmp_fx[( NB_DIV + 1 ) * M];
     Word16 lspnew_uw_fx[NB_DIV * M], lsfnew_uw_fx[NB_DIV * M];
     Word16 Aq_fx[( NB_SUBFR16k + 1 ) * ( M + 1 )];
     Word16 pit_gain_fx[NB_SUBFR16k];
@@ -530,17 +530,32 @@ void stereo_tcx_core_dec_fx(
         hTcxDec->envWeighted = 0;
         move16();
 
-        Copy( st->lspold_uw, lsp_fx, M ); /* Q15 */
-        Copy( st->lsfold_uw, lsf_fx, M ); /* Q2.56 */
+        Copy( st->lspold_uw, lsp_fx, M );     /* Q15 */
+        Copy( st->lsfold_uw, lsf_fx, M );     /* Q2.56 */
+        Copy( st->lsfold_uw, lsf_tmp_fx, M ); /* Q2.56 */
+
+        Word16 tmp;
+        Word16 sr_core_ratio = BASOP_Util_Divide3232_Scale( st->sr_core, INT_FS_12k8, &tmp );
 
         FOR( k = 0; k < st->numlpc; k++ )
         {
-            Copy( &lsfnew_uw_fx[k * M], &lsf_fx[( k + 1 ) * M], M ); /* Q2.56 */
+            Copy( &lsfnew_uw_fx[k * M], &lsf_fx[( k + 1 ) * M], M );     /* Q2.56 */
+            Copy( &lsfnew_uw_fx[k * M], &lsf_tmp_fx[( k + 1 ) * M], M ); /* Q2.56 */
 
-            lsf2lsp_fx( &lsf_fx[( k + 1 ) * M], &lsp_fx[( k + 1 ) * M], M, st->sr_core ); /* Q2.56 */
-            lsf2lsp_fx( st->lsf_q_cng, st->lsp_q_cng, M, st->sr_core );                   /* Q2.56 */
+            v_multc_fixed_16_16( &lsf_tmp_fx[( k + 1 ) * M], sr_core_ratio, &lsf_tmp_fx[( k + 1 ) * M], M );
+            Scale_sig( &lsf_tmp_fx[( k + 1 ) * M], M, tmp );
+            test();
+            IF( !st->lpcQuantization && EQ_32( st->sr_core, INT_FS_16k_FX ) )
+            {
+                lsf2lsp_fx( &lsf_tmp_fx[( k + 1 ) * M], &lsp_fx[( k + 1 ) * M], M, st->sr_core );
+            }
+            ELSE
+            {
+                lsf2lsp_fx( &lsf_fx[( k + 1 ) * M], &lsp_fx[( k + 1 ) * M], M, st->sr_core );
+            }
+            lsf2lsp_fx( st->lsf_q_cng, st->lsp_q_cng, M, st->sr_core );
 
-            Copy( &lsp_fx[( k + 1 ) * M], &lspnew_uw_fx[k * M], M ); /* Q2.56 */
+            Copy( &lsp_fx[( k + 1 ) * M], &lspnew_uw_fx[k * M], M ); /* Q15 */
         }
     }