ParamISM: Signal leakage above stop-frequency
# Basic info
- Encoder (float): 05925728e844a0b80b90cbb72bab08ab57e15b1a
- Decoder: 916e6860a5e9b7f40664722aa6d4ebf9a0c99130
# Bug description
In the FX decoder, we have at various spots for EXT output signal leakage above the stop frequency, e.g. at
* 4.960s
* 5.220s
Float:

BASOP:

# Ways to reproduce
* ./IVAS_cod_flt_ref -dtx -ism 3 bm6aa1s03.wav.0.csv bm6aa1s03.wav.1.csv bm6aa1s03.wav.2.csv -max_band FB 24400 48 bm6aa1s03.wav paramISM3--bm6aa1s03--24400--dtx.192
* ./IVAS_dec_fx EXT 48 paramISM3--bm6aa1s03--24400--dtx.192 paramISM3--bm6aa1s03--24400--dtx.clean.dec.EXT.fx.wav
* ./IVAS_dec_flt_ref EXT 48 paramISM3--bm6aa1s03--24400--dtx.192 paramISM3--bm6aa1s03--24400--dtx.clean.dec.EXT.flt.wav
issue