dicklyon@530: % Copyright 2012, Google, Inc.
dicklyon@530: % Author Richard F. Lyon
dicklyon@530: %
dicklyon@530: % This Matlab file is part of an implementation of Lyon's cochlear model:
dicklyon@530: % "Cascade of Asymmetric Resonators with Fast-Acting Compression"
dicklyon@530: % to supplement Lyon's upcoming book "Human and Machine Hearing"
dicklyon@530: %
dicklyon@530: % Licensed under the Apache License, Version 2.0 (the "License");
dicklyon@530: % you may not use this file except in compliance with the License.
dicklyon@530: % You may obtain a copy of the License at
dicklyon@530: %
dicklyon@530: %     http://www.apache.org/licenses/LICENSE-2.0
dicklyon@530: %
dicklyon@530: % Unless required by applicable law or agreed to in writing, software
dicklyon@530: % distributed under the License is distributed on an "AS IS" BASIS,
dicklyon@530: % WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
dicklyon@530: % See the License for the specific language governing permissions and
dicklyon@530: % limitations under the License.
dicklyon@530: 
dicklyon@530: function CF = CARFAC_Close_AGC_Loop(CF)
dicklyon@530: % function CF = CARFAC_Close_AGC_Loop(CF)
dicklyon@530: 
dicklyon@530: % fastest decimated rate determines interp needed:
dicklyon@530: decim1 = CF.AGC_params.decimation(1);
dicklyon@530: 
dicklyon@530: for mic = 1:CF.n_mics
dicklyon@530:   extra_damping = CF.AGC_state(mic).AGC_memory(:, 1);  % stage 1 result
dicklyon@530:   % Update the target stage gain for the new damping:
dicklyon@530:   new_g = CARFAC_Stage_g(CF.filter_coeffs(mic), extra_damping);
dicklyon@530:   % set the deltas needed to get to the new damping:
dicklyon@530:   CF.filter_state(mic).dzB_memory = ...
dicklyon@530:     (extra_damping - CF.filter_state(mic).zB_memory) / decim1;
dicklyon@530:   CF.filter_state(mic).dg_memory = ...
dicklyon@530:     (new_g - CF.filter_state(mic).g_memory) / decim1;
dicklyon@530: end