Encoder-related BWE issues for OMASA ISM1MASA2 at 48kbps for -16LKFS input

Basic info

  • Float reference:
    • Encoder (float):
    • Decoder (float):
  • Fixed point:

Bug description

There are BWE issues causing audible energy drops to ambience noise degrading the overall quality. Issue happens for ISM1MASA2 case at 48kbps mainly for input -16LKFS. It does not happen for -26LKFS input.

Plot for FX-FX

Screenshot_2025-09-12_at_12.58.18

Plot for FLT-FLT

Screenshot_2025-09-12_at_12.58.27

Plot for FLT-FX

Screenshot_2025-09-12_at_12.58.50

Ways to reproduce

Box folder: ...\Box_EXTERNAL_IVAS_BASOP_VERIFICATION\issues\basop-issue-2017

./IVAS_cod -ism_masa 1 2 cat1_concatenated.wav.0.csv cat1_concatenated.wav.met 48000 48 cat1_concatenated.wav cat1_concatenated_48kbps_ISM1_MASA2.192
./IVAS_dec binaural 48 cat1_concatenated_48kbps_ISM1_MASA2.192 cat1_concatenated_48kbps_ISM1_MASA2.wav
Edited by fotopoulou