diff trunk/carfac/agc.h @ 685:d0612798f6de

Additional changes to C++ CARFAC on the basis of ronw's comments on r289. Moved CARFAC::Design to CARFAC::CARFAC and CARFAC::Reset(), moved carfac_common.h to common.h, CARFACDetect to carfac_util.h/cc, FloatArray and Float2dArray to ArrayX and ArrayXX, improved variable naming, made a start on improved commenting documentation.

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/trunk/carfac/agc.h	Tue Jun 04 18:30:22 2013 +0000
@@ -0,0 +1,80 @@
+//
+//  agc.h
+//  CARFAC Open Source C++ Library
+//
+//  Created by Alex Brandmeyer on 5/30/13.
+//
+// This C++ 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.
+
+#ifndef CARFAC_AGC_H
+#define CARFAC_AGC_H
+
+#include <vector>
+#include "common.h"
+
+struct AGCParams {
+  AGCParams() {
+    num_stages = 4;
+    agc_stage_gain = 2.0;
+    time_constants.resize(num_stages);
+    agc1_scales.resize(num_stages);
+    agc2_scales.resize(num_stages);
+    agc1_scales[0] = 1.0;
+    agc2_scales[0] = 1.65;
+    time_constants[0] = 0.002;
+    for (int i = 1; i < num_stages; ++i) {
+      agc1_scales[i] = agc1_scales[i - 1] * sqrt(2.0);
+      agc2_scales[i] = agc2_scales[i - 1] * sqrt(2.0);
+      time_constants[i] = time_constants[i - 1] * 4.0;
+    }
+    decimation = {8, 2, 2, 2};
+    agc_mix_coeff = 0.5;
+  }
+  int num_stages;
+  FPType agc_stage_gain;
+  FPType agc_mix_coeff;
+  std::vector<FPType> time_constants;
+  std::vector<int> decimation;
+  std::vector<FPType> agc1_scales;
+  std::vector<FPType> agc2_scales;
+};
+
+struct AGCCoeffs {
+  int num_agc_stages;
+  FPType agc_stage_gain;
+  FPType agc_epsilon;
+  int decimation;
+  FPType agc_pole_z1;
+  FPType agc_pole_z2;
+  int agc_spatial_iterations;
+  FPType agc_spatial_fir_left;
+  FPType agc_spatial_fir_mid;
+  FPType agc_spatial_fir_right;
+  int agc_spatial_n_taps;
+  FPType agc_mix_coeffs;
+  FPType agc_gain;
+  FPType detect_scale;
+  FPType decim;
+};
+
+struct AGCState {
+  ArrayX agc_memory;
+  ArrayX input_accum;
+  int decim_phase;
+};
+
+#endif  // CARFAC_AGC_H
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