annotate carfac/car_params.cc @ 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.cc
//  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.

#include "car_params.h"

CARParams::CARParams() {
  velocity_scale_ = 0.1;
  v_offset_ = 0.04;
  min_zeta_ = 0.1;
  max_zeta_ = 0.35;
  first_pole_theta_ = 0.85 * PI;
  zero_ratio_ = sqrt(2.0);
  high_f_damping_compression_ = 0.5;
  erb_per_step_ = 0.5;
  min_pole_hz_ = 30;
  erb_break_freq_ = 165.3;  // This is the Greenwood map's break frequency.
  // This represents Glassberg and Moore's high-cf ratio.
  erb_q_ = 1000/(24.7*4.37);
};