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HBR low frequency stuttering fix

Motivation:

  • addressing low frequency stuttering issues heard in 714 LS renders of some HOA3 content.

SBA Modes affected:

  • HOA2/HOA3 inputs at 256kbps and above

This tuning fix includes three changes:

  • Covariance smoothing: additional smoothing at lower frequency bands to more closely match pre-merged SBA covariance smoothing behaviour.
  • Transient detection for covariance smoothing resetting: tuning of transient detector to work better with tonal signals
  • HP20 changes: all signals ingested by SPAR are now HPF'd at the encoder i.e. FOA + planar HOA signals where present (previously FOA only), and not at the decoder for HOA inputs.