commit	830db98cece945ff2208082c4e5b1e13b86ab08f	[log] [tgz]
author	Pin-chih Lin <johnylin@google.com>	Thu Nov 12 15:14:20 2020 +0800
committer	Pin-chih Lin <johnylin@google.com>	Thu Dec 03 17:25:16 2020 +0800
tree	ece801cec472160eee6e974e17537274522b53ed
parent	7aec6e22dcdca02aae0cb22ac988dde247f09f94 [diff]

sof: multiband_drc: Add Multiband DRC component

Multiband DRC is a single-source-single-sink compound component which
consists of 4 stages: Emphasis Equalizer, Crossover Filter (from 1-band to
4-band), DRC (per band), and Deemphasis Equalizer of summed stream.

The following graph illustrates a 3-band Multiband DRC component:

                                 low
                                o----> DRC0 ----o
                                |               |
                      3-WAY     |mid            |
x(n) --> EQ EMP --> CROSSOVER --o----> DRC1 ---(+)--> EQ DEEMP --> y(n)
                                |               |
                                |high           |
                                o----> DRC2 ----o

Signed-off-by: Pin-chih Lin <johnylin@google.com>