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[Non-BE] Resolve "Glitches in very low signals in ParamMC"

bayersrequested to merge
1091-glitches-in-very-low-signals-in-parammc into main

Reason why this change is needed

Using a too small epsilon in a step of the covariance synthesis for ParamMC, to be precise in the regularized inverse of Kx, can lead to bursts for very low signals in the synthesis.

Description of the change

Change the limit calculation for the regularized inverse of Kx in the covariance synthesis to avoid said glitches.

Affected operating points

  • Non-BE for ParamMC decoding using the covariance synthesis
  • Produced bitstream is BE compared to previous state.

Related to #1091 (closed)

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