annotate carfac/car_params.h @ 626:586b0677aae8

Fourth revision of Alex Brandmeyer's C++ implementation. Fixed more style issues, changed AGC structures to vectors, replaced FloatArray2d with vector<FloatArray>, implemented first tests using GTest to verify coefficients and monaural output against Matlab values (stored in aimc/carfac/test_data/). To run tests, change the path stored in carfac_test.h in TEST_SRC_DIR. Added CARFAC_GenerateTestData to the Matlab branch, fixed stage indexing in CARFAC_Cross_Couple.m to reflect changes in AGCCoeffs and AGCState structs.

//
//  car_params.h
//  CARFAC Open Source C++ Library
//
//  Created by Alex Brandmeyer on 5/10/13.
//
// 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_Open_Source_C__Library_CARParams_h
#define CARFAC_Open_Source_C__Library_CARParams_h

#include "carfac_common.h"

struct CARParams {
  CARParams();  // The constructor initializes using default parameter values.
  FPType velocity_scale_; // This is used for the velocity nonlinearity.
  FPType v_offset_;  // The offset gives us quadratic part.
  FPType min_zeta_;  // This is the minimum damping factor in mid-freq channels.
  FPType max_zeta_;  // This is the maximum damping factor in mid-freq channels.
  FPType first_pole_theta_;
  FPType zero_ratio_;  // This is how far zero is above the pole.
  FPType high_f_damping_compression_;  // A range from 0 to 1 to compress theta.
  FPType erb_per_step_;
  FPType min_pole_hz_;
  FPType erb_break_freq_;
  FPType erb_q_;
};

#endif