view trunk/carfac/car_params.h @ 621:d763637a05c5

Second check-in of Alex Brandmeyer's C++ implementation of CARFAC. Addressed style issues and completed implementation of remaining functions. Still needs proper testing of the output stages against the MATLAB version, and runtime functions need improvements in efficiency.

//
//  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.
  CARParams(FPType vs, FPType voff, FPType min_z, FPType max_z, FPType fpt,
                 FPType zr, FPType hfdc, FPType erbps, FPType mph, FPType erbbf,
                 FPType erbq);  // This is a method to set non-default params.
  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_;  // Here we assume G&M's ERB formula.
  FPType min_pole_hz_;
  FPType erb_break_freq_;  // This is the Greenwood map's break frequency.
  FPType erb_q_;  // This represents Glassberg and Moore's high-cf ratio.
};

#endif