dicklyon@500: function ears = CARFAC_Cross_Couple(ears);
dicklyon@498: 
dicklyon@500: n_ears = length(ears);
dicklyon@499: if n_ears > 1
dicklyon@500:   n_stages = ears(1).AGC_coeffs.n_AGC_stages;
dicklyon@499:   % now cross-ear mix the stages that updated (leading stages at phase 0):
dicklyon@500:   for stage = 1:n_stages
dicklyon@500:     if ears(1).AGC_state.decim_phase(stage) > 0
dicklyon@499:       break  % all recently updated stages are finished
dicklyon@499:     else
dicklyon@500:       mix_coeff = ears(1).AGC_coeffs.AGC_mix_coeffs(stage);
dicklyon@499:       if mix_coeff > 0  % Typically stage 1 has 0 so no work on that one.
dicklyon@499:         this_stage_sum = 0;
dicklyon@499:         % sum up over the ears and get their mean:
dicklyon@499:         for ear = 1:n_ears
dicklyon@500:           stage_state = ears(ear).AGC_state.AGC_memory(:, stage);
dicklyon@499:           this_stage_sum = this_stage_sum + stage_state;
dicklyon@499:         end
dicklyon@499:         this_stage_mean = this_stage_sum / n_ears;
dicklyon@499:         % now move them all toward the mean:
dicklyon@499:         for ear = 1:n_ears
dicklyon@500:           stage_state = ears(ear).AGC_state.AGC_memory(:, stage);
dicklyon@500:           ears(ear).AGC_state.AGC_memory(:, stage) = ...
dicklyon@499:             stage_state +  mix_coeff * (this_stage_mean - stage_state);
dicklyon@499:         end
dicklyon@498:       end
dicklyon@498:     end
dicklyon@498:   end
dicklyon@498: end