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[non-be] Adding back in the LFE LPF for the decoder

Adam Mills requested to merge adding_lfe_lpf_dec into main

Basic Info

Reason why this change is needed

  • We realized that both 2nd and 4th order LPFs were removed from LFE decoder at some point. The 4th order LPF is added back at 160 kbps MC paramupmix mode as MC paramupmix has additional 5 ms CLDFB delay (when compared to MCT). Its the same 4th order LPF that is present in LFE encoder in current main with a cut-off at 130 Hz. Note that the 2nd order LPF can still be removed.

Description of the change

  • 4th order LPF is enabled on LFE when there is sufficient delay between the LFE and other channels to accomodate the filter delay.'
  • 2nd filter chefs are removed as they are not needed. The changes in !1421 (closed) have been implemented in this MR.

Affected operating points

  • Multi-channel MCT and PARAMUPMIX modes.
Edited by Adam Mills

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