view matlab/bmm/carfac/CARFAC_SAI_hacking.m @ 610:01986636257a

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.

% Copyright 2013, Google, Inc.
% Author: Richard F. Lyon
%
% This Matlab 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.

%% Test/demo hacking for CARFAC_SAI Matlab stuff:

clear variables

system('mkdir frames');

%%

dB_list = -40; %  -60:20:0

wav_fn = 'plan.wav';

if ~exist(['./', wav_fn], 'file')
  error('wav file not found')
end

wav_fn
[file_signal, fs] = wavread(wav_fn);

if fs == 44100
  file_signal = (file_signal(1:2:end-1, :) + file_signal(2:2:end, :)) / 2;
  fs = fs / 2;
end

if fs ~= 22050
  error('unexpected sample rate')
end

file_signal = file_signal(:, 1);  % mono
file_signal = [file_signal; zeros(fs, 1)];  % pad with a second of silence


% make a long test signal by repeating at different levels:
test_signal = [];
for dB =  dB_list
  test_signal = [test_signal; file_signal * 10^(dB/20)];
end

%%
CF_struct = CARFAC_Design(1);  % default design

CF_struct = CARFAC_Init(CF_struct);

[frame_rate, num_frames] = SAI_RunLayered(CF_struct, test_signal);

%%
png_name_pattern = 'frames/frame%05d.png';
MakeMovieFromPngsAndWav(round(frame_rate), png_name_pattern, ...
  wav_fn, ['CARFAC_SAI_movie_', wav_fn(1:end-4), '.mpg'])

%%
system('rm -r frames');