diff trunk/matlab/bmm/carfac/CARFAC_Close_AGC_Loop.m @ 530:fb60ea429bb8

reparameterize stage gain g and compressed damping with theta; interpolate g

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/trunk/matlab/bmm/carfac/CARFAC_Close_AGC_Loop.m	Sun Mar 11 00:31:57 2012 +0000
@@ -0,0 +1,35 @@
+% Copyright 2012, Google, Inc.
+% Author Richard F. Lyon
+%
+% This Matlab file is part of an implementation of Lyon's cochlear model:
+% "Cascade of Asymmetric Resonators with Fast-Acting Compression"
+% to supplement Lyon's upcoming book "Human and Machine Hearing"
+%
+% Licensed under the Apache License, Version 2.0 (the "License");
+% you may not use this file except in compliance with the License.
+% You may obtain a copy of the License at
+%
+%     http://www.apache.org/licenses/LICENSE-2.0
+%
+% Unless required by applicable law or agreed to in writing, software
+% distributed under the License is distributed on an "AS IS" BASIS,
+% WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+% See the License for the specific language governing permissions and
+% limitations under the License.
+
+function CF = CARFAC_Close_AGC_Loop(CF)
+% function CF = CARFAC_Close_AGC_Loop(CF)
+
+% fastest decimated rate determines interp needed:
+decim1 = CF.AGC_params.decimation(1);
+
+for mic = 1:CF.n_mics
+  extra_damping = CF.AGC_state(mic).AGC_memory(:, 1);  % stage 1 result
+  % Update the target stage gain for the new damping:
+  new_g = CARFAC_Stage_g(CF.filter_coeffs(mic), extra_damping);
+  % set the deltas needed to get to the new damping:
+  CF.filter_state(mic).dzB_memory = ...
+    (extra_damping - CF.filter_state(mic).zB_memory) / decim1;
+  CF.filter_state(mic).dg_memory = ...
+    (new_g - CF.filter_state(mic).g_memory) / decim1;
+end