Energy burst when switching from TD stereo to FD stereo at 24.4 and 32 kbps

Basic info

• Float reference:
  • Encoder (float): e15ad0ad
  • Decoder (float):
• Fixed point:
  • Encoder (fixed): 54186be9
  • Decoder (fixed):

Bug description

When the stereo switch back from TD to FD, an energy burst is perceived on both channels. The figure below shows the effect on the left channel, but right channel is affected similarly.

from top to bottom :

• Float left channel
• Fixed left channel
• Element mode (same for both float and fixed)
• Spectrum

Ways to reproduce

Box folder: ...\Box_EXTERNAL_IVAS_BASOP_VERIFICATION\issues\issue-1364

IVAS_cod -stereo 24400  48 ap01a1s03.wav bit