Question: In EVS (Enhanced Voice Services) codec at 13.2 kbps and 32 kbps, what determines the selection between Transform-Domain BandWidth Extension (TD BWE) and Multi-mode Frequency-Domain BandWidth Extension (FD BWE) for encoding the high/super higher band signal of a wideband or super-wideband input?
Option 1: The type of input device used (e.g., microphone, headset)
Option 2: The coding mode of the low band signal and characteristics of the input signal (speech/music classification)
Option 3: The network's available bandwidth for the call
Option 4: The user's preference set in the phone settings
Explanation: According to EVS codec logic, the selection between TD BWE and Multi-mode FD BWE for high/super higher band signals is based on two key factors: the coding mode of the low band signal (e.g., LP-based, Transform-domain, IC mode) and characteristics of the input signal, specifically whether it's classified as speech or music by the speech/music classifier.