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doc/notes.txt : Resolved merge conflicts.

master
Kevin Larke 9 years ago
parent
commit
901f764d16
1 changed files with 59 additions and 3 deletions
  1. 59
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      doc/notes.txt

+ 59
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doc/notes.txt View File

@@ -730,7 +730,63 @@ Sequence Editor Design
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        Enable/Disable selected events.
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-    
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+=============================================================================
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+
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+                                  
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+                                      
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+                             a                   b
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+    piano --> mic ----> adc --> fbctl --> xform -+-> dac --> spkr --> room --+
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+     ^         ^                  ^              |                           |
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+     |         |                  |              |                           |
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+     |         |                  +--------------+                           |
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+     +---------+-------------------------------------------------------------+
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+
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+fbctl Design:
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+
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+      
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+
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+1. Measure the spectrum of the room impulse response.
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+   a. Generate a sine sweep, or Max. length sequance, s,  with a non-symetric envelope.
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+               
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+   b. Playback s and record the result N times
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+      using different mic. positions.
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+      
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+   c. S = STFT(s)
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+      R = sum(STFT(r_i) / N
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+      
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+   d. Align S and R using PHAT.
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+   e. RIR = mean(S - R)
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+
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+
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+2. Find the delay, d, which minimizes sum(a-b)
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+
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+       a ----------> DFT() --\
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+                              - --->  
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+       b --> z^d --> DFT() --/
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+       
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+
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+=============================================================================
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+
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+  1. Use spectral flux to generate an impulse signal: f.
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+  2. f' = 1-f correlates to the level of time dependency in the signal.
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+     Frames with a high time dependency contain more reberberated signal.
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+  3. Setup a 2xT NMF problem  Y = HE
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+  4. Initialize spectrum 1 as the f weighted avg. of all spectra.
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+  5. Initialize spectrum 2 as the f' weighted avg. of all spectra.
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+  6. Initialize env. 1 as f
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+  7. Initialize env. 2 as f'
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+  8. Allow all other variables, other than f', to vary - spectrum 2
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+     is the impulse response.  
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+
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+   alternatively use gradient descent, or alternating LS, rather than NMF
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+
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+
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+=============================================================================
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+
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+New vector library:
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+1. Use type generic pre-proc feature.
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+2. Explicit matrix representation.
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+3. Use BLAS and LAPACK.
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 =============================================================================
@@ -748,13 +804,13 @@ OSX - Install Notes
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 6. sudo port install fftw-3-single
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 7. port select --list gcc (which gcc is active)
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 8. sudo port install gcc47
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-9. sudo port --set gcc mp-gcc47
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+9. sudo port --set gcc mp-gcc47 (6/15/15 the default, mp-gcc5, works without this stp)
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    sudo port intsall gdb  (then edit /System/Library/LaunchDaemons/com.apple.taskgated.plist <string>s<string> to <string>sp<string>.
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 10. sudo port install fltk
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 11. sudo port install xorg-libX11 
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 12.sudo port install git
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 13.sudo port install emacs +x11
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-14 install ~/Library/Preferences/org.larke.kc.txt (is this required?)
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+14 install ~/Library/Preferences/org.larke.kc.txt (this is not required)
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 15 create ~/Library/Preferences/kc
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 16 Install ~/Library/Preferences/time_line.js, time_line_preset.js, time_line_preset.csv
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