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Stereo Encoder 32 kbps: Rattling artifcats in 16 kHz LTVs

Basic info

  • Float reference:
  • Fixed point:
    • Encoder (fixed): 28058dce
    • Decoder (fixed): n/a

Bug description

For 16 kHz input at 32 kbit/s Stereo, the BASOP encoder produces for some of the speech segments rattling artifacts, which probably indicate some regular discontinuities. Seems to be a 20ms grid.

In particular observable for the segments 2:43.4m - 2:44.8m and 2:55m - 2:57m

Float:

Bildschirmfoto 2025-03-12 um 15.24.53.png

BASOP:

Bildschirmfoto 2025-03-12 um 15.24.47.png

BASOP (zoomed in)

Bildschirmfoto 2025-03-12 um 15.26.45.png

Ways to reproduce

  • Encoder: ./IVAS_cod -stereo 32000 16 ltv16_STEREO.wav ltv16_STEREO_32kbps.192
  • Decoder: ./IVAS_dec stereo 16 ltv16_STEREO_32kbps.192 ltv16_STEREO_32kbps.wav