160 kbit/s ISM4 Encoder: FB BWE lacking energy

Basic info

• Float reference:
  • Encoder (float): b63c033f
  • Decoder (float): b63c033f
• Fixed point:
  • Encoder (fixed): 571ad39a
  • Decoder (fixed): n/a

Bug description

The FB BWE is lacking energy for certain segments, e.g. 2.5 - 4.6s, 5.9 - 6.1s and 6.3 - 7.0s. The depicted spectrograms are for ISM1, i.e. the first channel.

BASOP:

Float:

Ways to reproduce

IVAS_cod -ism 4 ivas-codec/scripts/testv/stvISM1.csv ivas-codec/scripts/testv/stvISM2.csv ivas-codec/scripts/testv/stvISM3.csv ivas-codec/scripts/testv/stvISM4.csv 160000 48 ivas-codec/scripts/testv/stv4ISM48s.wav out.192
IVAS_dec EXT 48 out.192 out.wav