# Basic info <!--- Add commit SHA used to reproduce --> - Float reference: - Encoder (float):6432cc34 - Fixed point: - Encoder (fixed):0cb1008 # Bug description The ACELP core synthesis energy can get very attenuated (almost disappearing) when the low rate mode is used (< 7.2kbps). The figure below show the issue, from top to bottom : - Float synthesis - secondary channel bitrate - float acelp core synthesis spectrogram - fixed point acelp core synthesis spectrogram - Low rate mode flag {width=1177 height=731} # Ways to reproduce -stereo 2 16400 48 C:\Temp\dp01a1s06.wav bit Box folder: ...\Box_EXTERNAL_IVAS_BASOP_VERIFICATION\issues\issue-xxxx <!-- Commandline or script --> ```bash ``` <!--- Below are labels that will be added but are not shown in description. This is a template to help fill them. Add further information to the first row and remove and add labels as necessary. -->