Increased noise in 6-14 kHz range with ParamBin rendering of MASA to STEREO using BASOP decoder

Basic info

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

Bug description

Using 1 TC MASA and DTX encoding from float encoder via FER insertion to BASOP decoder. This produces significant bandpass noise in 6-14 kHz region as shown in the figure below

Also happens with BASOP encoder. Does not happen with BASOP encoder + float decoder. This STEREO output but with MASA, this is handled by the same ParamBin renderer as binaural output.

Notably, the MLD of this effect is just 5.4 so it is not too high even though just over the limit we have selected for decoder.

Ways to reproduce

Box folder: ...\Box_EXTERNAL_IVAS_BASOP_VERIFICATION\issues\issue-1470

All files should be available but I have provided the test_0155.bs_eid in Box folder as well.

IVAS_cod -no_delay_cmp -masa 1 ltv48_MASA1TC.met -max_band swb -dtx 16400 48 ltv48_MASA1TC.wav test_0155.bs
eid-xor -fer -vbr -bs g192 -ep g192 test_0155.bs ep_10pct.g192 test_0155.bs_eid
IVAS_dec -no_delay_cmp STEREO 32 test_0155.bs_eid 0155_ltv48_MASA1TC.wav_16k4_48-32___STEREO-no_delay_cmp.wav