If LSF type input features within a frame are all zero, the Synthesis program should interpret this as a neutral filter (and maybe give a warning).
All-zero LSFs commonly arise from zero-padding during modeling. Although they are not valid LSFs, they should be treated gracefully. Currently, Synthesis tries to fix the LSFs, which results in sharply resonant filters and loud outputs.
If LSF type input features within a frame are all zero, the Synthesis program should interpret this as a neutral filter (and maybe give a warning).
All-zero LSFs commonly arise from zero-padding during modeling. Although they are not valid LSFs, they should be treated gracefully. Currently, Synthesis tries to fix the LSFs, which results in sharply resonant filters and loud outputs.