tom@516: % Copyright 2012, Google, Inc.
tom@516: % Author: Richard F. Lyon
tom@516: %
tom@516: % This Matlab file is part of an implementation of Lyon's cochlear model:
tom@516: % "Cascade of Asymmetric Resonators with Fast-Acting Compression"
tom@516: % to supplement Lyon's upcoming book "Human and Machine Hearing"
tom@516: %
tom@516: % Licensed under the Apache License, Version 2.0 (the "License");
tom@516: % you may not use this file except in compliance with the License.
tom@516: % You may obtain a copy of the License at
tom@516: %
tom@516: %     http://www.apache.org/licenses/LICENSE-2.0
tom@516: %
tom@516: % Unless required by applicable law or agreed to in writing, software
tom@516: % distributed under the License is distributed on an "AS IS" BASIS,
tom@516: % WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
tom@516: % See the License for the specific language governing permissions and
tom@516: % limitations under the License.
tom@516: 
tom@516: %% Test/demo hacking for CARFAC Matlab stuff:
tom@516: 
tom@516: clear variables
tom@516: 
tom@516: %%
dicklyon@536: use_plan_file = 0;
dicklyon@536: if use_plan_file
dicklyon@536:   
dicklyon@536:   file_signal = wavread('plan.wav');
dicklyon@536:   file_signal = file_signal(8100+(1:20000));  % trim for a faster test
dicklyon@536:   
dicklyon@536: else
dicklyon@536:     flist = [1000];
dicklyon@536:     alist = [1];
dicklyon@536:     flist = 1000;
dicklyon@536:     alist = 1;
dicklyon@536:     sine_signal = 0;
dicklyon@536:     times = (0:19999)' / 22050;
dicklyon@536:     for fno = 1:length(flist)
dicklyon@536:       sine_signal = sine_signal + alist(fno)*sin(flist(fno)*2*pi*times);
dicklyon@536:     end
dicklyon@536:     growth_power = 0;  % use 0 for flat, 4 or more for near exponential
dicklyon@536:     file_signal = 1.0 * (sine_signal .* (times/max(times)).^growth_power);
dicklyon@536: end
tom@516: 
tom@516: % repeat with negated signal to compare responses:
dicklyon@517: % file_signal = [file_signal; -file_signal];
tom@516: 
tom@516: % make a long test signal by repeating at different levels:
dicklyon@536: dB = -80;
dicklyon@536: test_signal =  10^(dB/20)* file_signal(1:4000) % lead-in [];
dicklyon@536: for dB =  -80:20:80
tom@516:   test_signal = [test_signal; file_signal * 10^(dB/20)];
tom@516: end
tom@516: 
tom@516: %%
tom@516: CF_struct = CARFAC_Design;  % default design
tom@516: 
tom@516: %% Run mono, then stereo test:
tom@516: 
tom@516: agc_plot_fig_num = 6;
tom@516: 
dicklyon@536: for n_ears = 1  % 1:2
dicklyon@534:   CF_struct = CARFAC_Init(CF_struct, n_ears);
tom@516: 
dicklyon@536:   [CF_struct, nap_decim, nap, BM] = CARFAC_Run(CF_struct, test_signal, ...
dicklyon@534:     agc_plot_fig_num);
tom@516: 
tom@516: %   nap = deskew(nap);  % deskew doesn't make much difference
tom@516: 
dicklyon@536: %   dB_BM = 10/log(10) * log(filter(1, [1, -0.995], BM(:, 38:40, :).^2));
dicklyon@536:   dB_BM = 10/log(10) * log(filter(1, [1, -0.995], BM(:, 20:50, :).^2));
dicklyon@536: 
dicklyon@534:   if n_ears == 1  % because this hack doesn't work for binarual yet
dicklyon@536:     MultiScaleSmooth(dB_BM(5000:200:end, :, :), 1);
dicklyon@536: %     MultiScaleSmooth(nap_decim, 4);
dicklyon@517:   end
tom@516: 
dicklyon@534:   % Display results for 1 or 2 ears:
dicklyon@534:   for ear = 1:n_ears
dicklyon@534:     smooth_nap = nap_decim(:, :, ear);
dicklyon@534:     if n_ears == 1
tom@516:       mono_max = max(smooth_nap(:));
tom@516:     end
dicklyon@534:     figure(3 + ear + n_ears)  % Makes figures 5, ...
tom@516:     image(63 * ((max(0, smooth_nap)/mono_max)' .^ 0.5))
tom@516:     title('smooth nap from nap decim')
tom@516:     colormap(1 - gray);
tom@516:   end
tom@516: 
tom@516:   % Show resulting data, even though M-Lint complains:
tom@516:   CF_struct
dicklyon@534:   CF_struct.CAR_state
tom@516:   CF_struct.AGC_state
tom@516:   min_max_decim = [min(nap_decim(:)), max(nap_decim(:))]
tom@516: 
tom@516:   % For the 2-channel pass, add a silent second channel:
tom@516:   test_signal = [test_signal, zeros(size(test_signal))];
tom@516: end
tom@516: 
tom@516: % Expected result:  Figure 3 looks like figure 2, a tiny bit darker.
tom@516: % and figure 4 is empty (all zero)