BASOP encoder ParamISM: strong timbre differences in the noise track

Basic info

• Float reference:
  • Encoder (float): f7a0e207 (ivas-float-update)
  • Decoder (float): f7a0e207 (ivas-float-update)
• Fixed point:
  • Encoder (fixed): 12778592 (main)

Bug description

the noise sounds very different with the fixed and floating-point encoders

Ways to reproduce

./IVAS_cod_flt_ref -q -dtx -ism 4 bm6ba1s05.0.csv bm6ba1s05.1.csv bm6ba1s05.2.csv bm6ba1s05.3.csv -max_band FB 24400 48 bm6ba1s05_48.wav bit

./IVAS_dec_flt_ref -q EXT 48 bit decoded.wav

Most likely this is a DTX specific issue. The only combination that sounds different is the FX encoder with DTX. With the float encoder, the DTX and non-DTX outputs sound very similar. Probably the float encoder does not classify this part as inactive but the fx encoder does.

Box folder: ...\Box_EXTERNAL_IVAS_BASOP_VERIFICATION\issues\issue-1202