Stereo Encoder 13.2 kbps: Wrong Classification for Noisy Content on LTV

Basic info

• Float reference:
  • Encoder (float): f2eb9e08
  • Decoder (float): f2eb9e08
• Fixed point:
  • Encoder (fixed): 28058dce
  • Decoder (fixed): n/a

Bug description

For 13.2 kbit/s, the noise portion in the LTVs from 0:38.3 - 0:40.3 (left channel) seems to get classified differently between BASOP and Float encoder. The issue is also visible at 16.4 kbit/s, but not at 24.4 kbit/s.

BASOP:

Float:

It sounds as if for BASOP one of the transform cores (HQ?) is selected, and it sounds significangtly worse than in Float.

Ways to reproduce

IVAS_cod -stereo 13200 32 ivas-pc-testfiles/ltv32_STEREO.wav ltv32_STEREO_13k2bps.192
IVAS_dec stereo 32 ltv32_STEREO_13k2bps.192 ltv32_STEREO_13k2bps.wav