From: drowe67 <drowe67@01035d8c-6547-0410-b346-abe4f91aad63>
Date: Thu, 8 Dec 2016 06:23:02 +0000 (+0000)
Subject: experimental variable rate decimation in time
X-Git-Url: http://git.whiteaudio.com/gitweb/?a=commitdiff_plain;h=95d76ceb9fdd4173faec0d28912bcf6443ca6c02;p=freetel-svn-tracking.git

experimental variable rate decimation in time

git-svn-id: https://svn.code.sf.net/p/freetel/code@2928 01035d8c-6547-0410-b346-abe4f91aad63
---

diff --git a/codec2-dev/octave/newamp1_batch.m b/codec2-dev/octave/newamp1_batch.m
index 43510985..0fb04737 100644
--- a/codec2-dev/octave/newamp1_batch.m
+++ b/codec2-dev/octave/newamp1_batch.m
@@ -16,12 +16,17 @@
 %   codec2-dev/build_linux/src$ ./c2sim ../../raw/hts2a.raw --amread hts2a_am.out --awread hts2a_aw.out --phase0 --postfilter --Woread hts2a_Wo.out -o - | play -q -t raw -r 8000 -s -2 -
 
 % process a whole file and write results
+% TODO: 
+%   [ ] refactor decimate-in-time to avoid extra to/from model conversions
+%   [ ] switches to turn on/off quantisation
+%   [ ] rename mask_sample_freqs, do we need "mask" any more
 
 function [fvec_log amps_log] = newamp1_batch(samname, optional_Am_out_name, optional_Aw_out_name)
   newamp;
   more off;
 
   max_amp = 80;
+  decimate = 4;
   load vq;
 
   model_name = strcat(samname,"_model.txt");
@@ -40,33 +45,34 @@ function [fvec_log amps_log] = newamp1_batch(samname, optional_Am_out_name, opti
 
   fvec_log = []; amps_log = [];
 
-  for f=1:frames
-    printf("%d ", f);   
+  % prime initial values so first pass iterpolator works.  TODO: improve this
 
+  for f=1:frames
     Wo = model(f,1);
     L = min([model(f,2) max_amp-1]);
     Am = model(f,3:(L+2));
     AmdB = 20*log10(Am);
+    e(f) = sum(AmdB)/L;
 
-    % find mask
+    % fit model
 
-    #{
-    maskdB = mask_model(AmdB, Wo, L);
-    AmdB_ = maskdB;
-    [mx mx_ind] = max(AmdB_);
-    AmdB_(mx_ind) += 6;
-    #}
-
-    [AmdB_ res fvec fvec_ amps] = piecewise_model(AmdB, Wo, vq, 1);
+    [AmdB_ res fvec fvec_ amps] = piecewise_model(AmdB, Wo);
     fvec_log = [fvec_log; fvec];
     amps_log = [amps_log; amps];
-    #{
-    l1000 = floor(L/4);     
-    AmdB_ = AmdB;
-    [mx mx_ind] = max(AmdB_(1:l1000));
-    mask_sample_freqs_kHz = (1:l1000)*Wo*4/pi;
-    AmdB_(1:l1000) = parabolic_resonator(mx_ind*Wo*4/pi, mask_sample_freqs_kHz) + mx;  
-    #}
+
+    model_(f,1) = Wo; model_(f,2) = L; model_(f,3:(L+2)) = 10 .^ (AmdB_(1:L)/20);
+  end
+
+  for f=1:frames
+    if (f > 1) && (e(f) > (e(f-1)+3))
+        decimate = 2;
+      else
+        decimate = 4;
+    end
+    printf("%d ", decimate);   
+
+    AmdB_ = decimate_frame_rate(model_, decimate, f, frames);
+    L = length(AmdB_);
 
     Am_ = zeros(1,max_amp);
     Am_(2:L) = 10 .^ (AmdB_(1:L-1)/20);  % C array doesnt use A[0]
@@ -77,5 +83,7 @@ function [fvec_log amps_log] = newamp1_batch(samname, optional_Am_out_name, opti
   fclose(fam);
   printf("\n")
 
+  figure(1); clf;
+  plot(e,'+-');
 endfunction