1 files changed, 0 insertions, 72 deletions
diff --git a/drivers/speex/echo_diagnostic.m b/drivers/speex/echo_diagnostic.m
deleted file mode 100644
index aebf390672..0000000000
--- a/drivers/speex/echo_diagnostic.m
+++ /dev/null
@@ -1,72 +0,0 @@
-% Attempts to diagnose AEC problems from recorded samples
-%
-% out = echo_diagnostic(rec_file, play_file, out_file, tail_length)
-%
-% Computes the full matrix inversion to cancel echo from the 
-% recording 'rec_file' using the far end signal 'play_file' using 
-% a filter length of 'tail_length'. The output is saved to 'out_file'.
-function out = echo_diagnostic(rec_file, play_file, out_file, tail_length)
-
-F=fopen(rec_file,'rb');
-rec=fread(F,Inf,'short');
-fclose (F);
-F=fopen(play_file,'rb');
-play=fread(F,Inf,'short');
-fclose (F);
-
-rec = [rec; zeros(1024,1)];
-play = [play; zeros(1024,1)];
-
-N = length(rec);
-corr = real(ifft(fft(rec).*conj(fft(play))));
-acorr = real(ifft(fft(play).*conj(fft(play))));
-
-[a,b] = max(corr);
-
-if b > N/2
-      b = b-N;
-end
-printf ("Far end to near end delay is %d samples\n", b);
-if (b > .3*tail_length)
-      printf ('This is too much delay, try delaying the far-end signal a bit\n');
-else if (b < 0)
-      printf ('You have a negative delay, the echo canceller has no chance to cancel anything!\n');
-   else
-      printf ('Delay looks OK.\n');
-      end
-   end
-end
-N2 = round(N/2);
-corr1 = real(ifft(fft(rec(1:N2)).*conj(fft(play(1:N2)))));
-corr2 = real(ifft(fft(rec(N2+1:end)).*conj(fft(play(N2+1:end)))));
-
-[a,b1] = max(corr1);
-if b1 > N2/2
-      b1 = b1-N2;
-end
-[a,b2] = max(corr2);
-if b2 > N2/2
-      b2 = b2-N2;
-end
-drift = (b1-b2)/N2;
-printf ('Drift estimate is %f%% (%d samples)\n', 100*drift, b1-b2);
-if abs(b1-b2) < 10
-   printf ('A drift of a few (+-10) samples is normal.\n');
-else
-   if abs(b1-b2) < 30
-      printf ('There may be (not sure) excessive clock drift. Is the capture and playback done on the same soundcard?\n');
-   else
-      printf ('Your clock is drifting! No way the AEC will be able to do anything with that. Most likely, you''re doing capture and playback from two different cards.\n');
-      end
-   end
-end
-acorr(1) = .001+1.00001*acorr(1);
-AtA = toeplitz(acorr(1:tail_length));
-bb = corr(1:tail_length);
-h = AtA\bb;
-
-out = (rec - filter(h, 1, play));
-
-F=fopen(out_file,'w');
-fwrite(F,out,'short');
-fclose (F);