annotate trunk/C++/Ear.C @ 598:34dccba19c54

Fixed certain minor documentation bugs.
Added the CAR::designFilters and CAR::stageG methods. These methods design the CAR.coeff coefficients. They have been compared to be the same as the matlab coefficients.
An Ear is now contructed with a specific FS or, it uses the default.
Added the PsychoAcoustics class to do ERB and Hz conversions.
Added the EarTest.C main which allows the construction of an Ear class for testing.

// Copyright 2013 Matt R. Flax <flatmax\@> All Rights Reserved.
// Author Matt Flax <flatmax@>
//
// 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.
/**
    \author {Matt Flax <flatmax\@>}
    \date 2013.02.08
*/

#include "Ear.H"

Ear::Ear(FP_TYPE fs_) {
    fs=fs_; // set the specified sample rate
    design();
}

Ear::Ear(void) {
    fs=DEFAULT_SAMPLERATE; // Use the default sample rate
    design();
}

Ear::~Ear(void) {
}

void Ear::design(void) {

    // first figure out how many filter stages (PZFC/car.AC channels):
    FP_TYPE pole_Hz = car.param.first_pole_theta * fs / (2.*M_PI);
    n_ch = 0;
    while (pole_Hz > car.param.min_pole_Hz) {
        n_ch = n_ch + 1;
        pole_Hz = pole_Hz - car.param.ERB_per_step *
                  PsychoAcoustics::Hz2ERB(pole_Hz, car.param.ERB_break_freq, car.param.ERB_Q);
    }
    // Now we have n_ch, the number of channels, so can make the array
    // and compute all the frequencies again to put into it:
    car.pole_freqs.resize(n_ch, NoChange);
    pole_Hz = car.param.first_pole_theta * fs / (2.*M_PI);
    for (int ch = 0; ch<n_ch; ch++) {
        car.pole_freqs[ch] = pole_Hz;
        pole_Hz = pole_Hz - car.param.ERB_per_step *
                  PsychoAcoustics::Hz2ERB(pole_Hz, car.param.ERB_break_freq, car.param.ERB_Q);
    }
    // now we have n_ch, the number of channels, and pole_freqs array

    max_channels_per_octave = (FP_TYPE)(log(2.) / log(car.pole_freqs[0]/car.pole_freqs[1]));

    // convert to include an ear_array, each w coeffs and state...
    car.designFilters(fs, n_ch); //(car.param. fs, car.pole_freqs);
    //AGC.designAGC(CF_AGC_params, fs, n_ch);
    //IHC.designIHC(CF_IHC_params, fs, n_ch);
}