Degradation in channel check vector at 13.2, 16.4, 24.4kbps SBA

Basic info

Audible quality degradation in fixed point encoder at 13.2, 16.4, 24.4kbps SBA bitrates in a specific vector.

• Float reference:
  • Encoder (float):b63c033f
  • Decoder (float):b63c033f
  • Renderer (float):b63c033f
• Fixed point:
  • Encoder (fixed):f66bba2c
  • Decoder (float):b63c033f
  • Renderer (float):b63c033f

Bug description

Audible degradation in the following time stamps:

16.4 and 24.4kbps: 7.7-10.55sec

13.2kbps: 2.0-2.7sec, 7.7-8.4sec, 12.7-13.46sec

Ways to reproduce

Box folder: ...\Box_EXTERNAL_IVAS_BASOP_VERIFICATION\issues\issue-1476

IVAS_cod_fx -sba 3 -no_delay_cmp [BR] 48.0 in.wav bs.g192
IVAS_dec_fl -no_delay_cmp HOA3 48.0 bs.g192 decoded.wav
IVAS_rend_fl -i decoded.wav -if HOA3 -o rendered_fx.wav -of BINAURAL

IVAS_cod_fl -sba 3 -no_delay_cmp [BR] 48.0 in.wav bs.g192
IVAS_dec_fl -no_delay_cmp HOA3 48.0 bs.g192 decoded.wav
IVAS_rend_fl -i decoded.wav -if HOA3 -o rendered_fl.wav -of BINAURAL

(Tested on MacOS.)