Mel or wav？

[howitry]

Great work! I want to ask if you have tried using mel as input? If mel is used as input and the same bitrate is maintained (e.g. frameshift=256, encoder downsampled by 3 times), will the performance of the model change significantly?

[jishengpeng]

Great work! I want to ask if you have tried using mel as input? If mel is used as input and the same bitrate is maintained (e.g. frameshift=256, encoder downsampled by 3 times), will the performance of the model change significantly?

From my perspective, it seems feasible to input Mel spectrograms and maintain the same or even higher compression ratios without significantly degrading performance. However, I am puzzled as to why most current codecs do not adopt this approach. What is the rationale behind this decision？