BASOP encoder: Distortion Stereo DTX 24.4 kbps, high MLD

Basic info

• Float reference:
  • Encoder (float): f2eb9e08
  • Decoder (float): f2eb9e08
• Fixed point:
  • Encoder (fixed): 339e804c
  • Decoder (fixed):

Bug description

Distortion is observed for BASOP encoder with Stereo DTX at 24.4 kbps, audible around 7.4 second and 8.2 second. The same issue is present in encoder release: 08641917

Results in high MLD ~16.

Float:

Basop:

Ways to reproduce

Box folder: ...\Box_EXTERNAL_IVAS_BASOP_VERIFICATION\issues\issue-1407

 ./IVAS_cod.exe -dtx -stereo 24400 48 canw.wav bit
./IVAS_dec_ref.exe stereo 48 bit outdut.wav

 ./IVAS_cod_ref.exe -dtx -stereo 24400 48 canw.wav bitref
./IVAS_dec_ref.exe stereo 48 bitref outref.wav