SpHEAR/sphear_fir_render.m

%%
%% *SpHEAR Project
%% sphear_fir_render: render impulse responses throught the FIR filter A2B matrix
%%
%% usage:
%%   [] = sphear_fir_render(FIR, fmin, fmax, N, Npre)
%%
%% FIR: A2B matrix of FIR filters
%% fmin, fmax: range of frequencies to use
%% N: number of samples to filter
%% Npre: number of samples before the main impulse peak
%%
%% Copyright 2016, Fernando Lopez-Lezcano, All Rights Reserved
%% nando@ccrma.stanford.edu
%%
%%  This program is free software: you can redistribute it and/or modify
%%  it under the terms of the GNU General Public License as published by
%%  the Free Software Foundation, either version 3 of the License, or
%%  (at your option) any later version.
%%
%%  This program is distributed in the hope that it will be useful,
%%  but WITHOUT ANY WARRANTY; without even the implied warranty of
%%  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
%%  GNU General Public License for more details.
%%
%%  You should have received a copy of the GNU General Public License
%%  along with this program.  If not, see <http://www.gnu.org/licenses/>.

function sphear_fir_render(FIR, fmin, fmax, N, Npre)

  [ref, Fs] = wavread('../cal/2016.04.20/export/reference-001-1.wav');
  %% find highest peak location and define sample range
  [peaks, locs] = findpeaks(abs(ref));
  [~, index] = max(peaks);
  start = locs(index) - Npre;
  range = start:(start + N - 1);
  ref_fft = fft(ref(range), N);
  
  capnames = cellstr(['LF'; 'RF'; 'LB'; 'RB']);

  raw = 0;

  for m = 1:16
    c1 = wavread(["../cal/2016.04.20/export/a-format-0" sprintf("%02.0f", m) "-" char(capnames(1)) ".wav"])(range);
    w1 = fftfilt(reshape(FIR(1,1,:), 1, [])', c1);
    x1 = fftfilt(reshape(FIR(2,1,:), 1, [])', c1);
    y1 = fftfilt(reshape(FIR(3,1,:), 1, [])', c1);
    z1 = fftfilt(reshape(FIR(4,1,:), 1, [])', c1);
    c2 = wavread(["../cal/2016.04.20/export/a-format-0" sprintf("%02.0f", m) "-" char(capnames(2)) ".wav"])(range);
    w2 = fftfilt(reshape(FIR(1,2,:), 1, [])', c2);
    x2 = fftfilt(reshape(FIR(2,2,:), 1, [])', c2);
    y2 = fftfilt(reshape(FIR(3,2,:), 1, [])', c2);
    z2 = fftfilt(reshape(FIR(4,2,:), 1, [])', c2);
    c3 = wavread(["../cal/2016.04.20/export/a-format-0" sprintf("%02.0f", m) "-" char(capnames(3)) ".wav"])(range);
    w3 = fftfilt(reshape(FIR(1,3,:), 1, [])', c3);
    x3 = fftfilt(reshape(FIR(2,3,:), 1, [])', c3);
    y3 = fftfilt(reshape(FIR(3,3,:), 1, [])', c3);
    z3 = fftfilt(reshape(FIR(4,3,:), 1, [])', c3);
    c4 = wavread(["../cal/2016.04.20/export/a-format-0" sprintf("%02.0f", m) "-" char(capnames(4)) ".wav"])(range);
    w4 = fftfilt(reshape(FIR(1,4,:), 1, [])', c4);
    x4 = fftfilt(reshape(FIR(2,4,:), 1, [])', c4);
    y4 = fftfilt(reshape(FIR(3,4,:), 1, [])', c4);
    z4 = fftfilt(reshape(FIR(4,4,:), 1, [])', c4);

    if (raw == 1)
      wc = c1 + c2 + c3 + c4;
      xc = c1 + c2 - c3 - c4;
      yc = c1 - c2 + c3 - c4;
      zc = c1 - c2 - c3 + c4;
      rawlabel = "_raw";
    else
      wc = w1 + w2 + w3 + w4;
      xc = x1 + x2 + x3 + x4;
      yc = y1 + y2 + y3 + y4;
      zc = z1 + z2 + z3 + z4;
      rawlabel = "";
    end
    
    f = figure;
    hold on;
    Nfft = 4096;
    wfft = 20*log10(abs(fft(wc, Nfft)));
    xfft = 20*log10(abs(fft(xc, Nfft)));
    yfft = 20*log10(abs(fft(yc, Nfft)));
    zfft = 20*log10(abs(fft(zc, Nfft)));
    smooth = 12;
    wcr = fastsmooth(wfft, smooth, 2, 1);
    xcr = fastsmooth(xfft, smooth, 2, 1);
    ycr = fastsmooth(yfft, smooth, 2, 1);
    zcr = fastsmooth(zfft, smooth, 2, 1);
    fr = (1:Nfft/2) * Fs/Nfft;
    grid on;
    angle = 360 / 16 * (m -1); 
    title(sprintf("azimuth = %05.1f degrees", angle));
    axis([300, 20000, -60, 6]);
    semilogx(fr, wcr(1:end/2), 'k;W;');
    semilogx(fr, xcr(1:end/2), 'r;X;');
    semilogx(fr, ycr(1:end/2), 'b;Y;');
    semilogx(fr, zcr(1:end/2), 'g;Z;');
    l = legend('W', 'X', 'Y', 'Z');
    legend(l, 'location', 'southwest');
    hold off;
    print(f, '-dpng','-color',["figures/sphear_b_vs_angle_" sprintf("%03.0f", angle) rawlabel ".png"]);
  end

end