Stereo Encoder: BWE artefact at 48 kbps LTV

Basic info

• Float reference:
  • Encoder (float): f2eb9e08
  • Decoder (float): f2eb9e08
• Fixed point:
  • Encoder (fixed): 7f488e0a
  • Decoder (fixed): n/a

Bug description

For 48 kbit/s stereo encoding, there is a very outstanding BWE difference right at the beginning of LTV at 0:01.8:

BASOP:

Float:

From a perceptual perspective it's not super-critical, but it's so outstanding that it's probably easy to debug.

Ways to reproduce

IVAS_cod -stereo -dtx 48000 32 ltv32_STEREO.wav ltv32_STEREO_48kbps_DTX.192
IVAS_dec stereo 32 ltv32_STEREO_48kbps_DTX.192 ltv32_STEREO_48kbps_DTX.wav