5 to 15 dB spectral differences observed in top and bottom end of spectra of signal decoded from signal decoded from 16.4kbps encoded HOA3 audio

Basic info

• Encoder/Decoder (float): 00ba8bcd
• Encoder (fixed): 24f29d12

Bug description

Input format: HOA3

Sample rate: 16k

Level: -16LKFS

Bitrate: 16.4k

DTX: False

Observations: The screen capture below shows the difference observed in channel one of the signals dm5aa1s08_HOA3_16_-16_16400_CTX_dut_HOA3_ref.wav and dm5aa1s08_HOA3_16_-16_16400_CTX_ref_HOA3_ref.wav. This is observed with all the test vectors provided in the box folder.

Ways to reproduce

Box folder: ...\Box\_EXTERNAL_IVAS_BASOP_VERIFICATION\issues\issue-1099

Command lines: see cmds.txt in box folder.