alexbrandmeyer@643: //
alexbrandmeyer@643: //  ihc.h
alexbrandmeyer@643: //  CARFAC Open Source C++ Library
alexbrandmeyer@643: //
alexbrandmeyer@643: //  Created by Alex Brandmeyer on 5/30/13.
alexbrandmeyer@643: //
alexbrandmeyer@643: // This C++ file is part of an implementation of Lyon's cochlear model:
alexbrandmeyer@643: // "Cascade of Asymmetric Resonators with Fast-Acting Compression"
alexbrandmeyer@643: // to supplement Lyon's upcoming book "Human and Machine Hearing"
alexbrandmeyer@643: //
alexbrandmeyer@643: // Licensed under the Apache License, Version 2.0 (the "License");
alexbrandmeyer@643: // you may not use this file except in compliance with the License.
alexbrandmeyer@643: // You may obtain a copy of the License at
alexbrandmeyer@643: //
alexbrandmeyer@643: //     http://www.apache.org/licenses/LICENSE-2.0
alexbrandmeyer@643: //
alexbrandmeyer@643: // Unless required by applicable law or agreed to in writing, software
alexbrandmeyer@643: // distributed under the License is distributed on an "AS IS" BASIS,
alexbrandmeyer@643: // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
alexbrandmeyer@643: // See the License for the specific language governing permissions and
alexbrandmeyer@643: // limitations under the License.
alexbrandmeyer@643: 
alexbrandmeyer@643: #ifndef CARFAC_IHC_H
alexbrandmeyer@643: #define CARFAC_IHC_H
alexbrandmeyer@643: 
alexbrandmeyer@643: #include "common.h"
alexbrandmeyer@643: 
alexbrandmeyer@643: struct IHCParams {
alexbrandmeyer@643:   IHCParams() {
alexbrandmeyer@643:     just_half_wave_rectify = false;
alexbrandmeyer@643:     one_capacitor = true;
alexbrandmeyer@643:     tau_lpf = 0.000080;
alexbrandmeyer@643:     tau1_out = 0.0005;
alexbrandmeyer@643:     tau1_in = 0.010;
alexbrandmeyer@643:     tau2_out = 0.0025;
alexbrandmeyer@643:     tau2_in = 0.005;
alexbrandmeyer@643:     ac_corner_hz = 20.0;
alexbrandmeyer@643:   };
alexbrandmeyer@643:   bool just_half_wave_rectify;
alexbrandmeyer@643:   bool one_capacitor;
alexbrandmeyer@643:   FPType tau_lpf;
alexbrandmeyer@643:   FPType tau1_out;
alexbrandmeyer@643:   FPType tau1_in;
alexbrandmeyer@643:   FPType tau2_out;
alexbrandmeyer@643:   FPType tau2_in;
alexbrandmeyer@643:   FPType ac_corner_hz;
alexbrandmeyer@643: };
alexbrandmeyer@643: 
alexbrandmeyer@643: struct IHCCoeffs {
alexbrandmeyer@643:   bool just_half_wave_rectify;
alexbrandmeyer@643:   bool one_capacitor;
alexbrandmeyer@643:   FPType lpf_coeff;
alexbrandmeyer@643:   FPType out1_rate;
alexbrandmeyer@643:   FPType in1_rate;
alexbrandmeyer@643:   FPType out2_rate;
alexbrandmeyer@643:   FPType in2_rate;
alexbrandmeyer@643:   FPType output_gain;
alexbrandmeyer@643:   FPType rest_output;
alexbrandmeyer@643:   FPType rest_cap1;
alexbrandmeyer@643:   FPType rest_cap2;
alexbrandmeyer@643:   FPType ac_coeff;
alexbrandmeyer@643:   FPType cap1_voltage;
alexbrandmeyer@643:   FPType cap2_voltage;
alexbrandmeyer@643: };
alexbrandmeyer@643: 
alexbrandmeyer@643: struct IHCState {
alexbrandmeyer@643:   ArrayX ihc_out;
alexbrandmeyer@643:   ArrayX ihc_accum;
alexbrandmeyer@643:   ArrayX cap1_voltage;
alexbrandmeyer@643:   ArrayX cap2_voltage;
alexbrandmeyer@643:   ArrayX lpf1_state;
alexbrandmeyer@643:   ArrayX lpf2_state;
alexbrandmeyer@643:   ArrayX ac_coupler;
alexbrandmeyer@643: };
alexbrandmeyer@643: 
alexbrandmeyer@643: #endif  // CARFAC_IHC_H