1 files changed, 295 insertions, 0 deletions
diff --git a/adaptive/src/lms~.c b/adaptive/src/lms~.c
new file mode 100755
index 0000000..d39ccb7
--- /dev/null
+++ b/adaptive/src/lms~.c
@@ -0,0 +1,295 @@
+/******************************************************
+ *
+ * Adaptive Systems for PD
+ *
+ * copyleft (c) Gerda Strobl, Georg Holzmann
+ * 2005
+ *
+ * for complaints, suggestions: grh@mur.at
+ *
+ ******************************************************
+ *
+ * license: GNU General Public License v.2
+ *
+ ******************************************************/
+
+#include "adaptive.h"
+
+
+/* ------------------------ lms~ ------------------------- */
+
+static t_class *lms_tilde_class;
+
+typedef struct _lms
+{
+  t_object x_obj;
+  t_float f;
+  t_sample *buf;
+  t_sample *tmp;
+  t_int bufsize;
+  int adapt; // enable/disable adaptation
+  
+  t_int N; //number of coefficients of the adaptive system
+  t_float *c; // coefficients of the system
+  t_float mu; // step-size parameter (learning rate)
+
+  t_canvas *x_canvas;
+} t_lms_tilde;
+
+static void lms_tilde_a(t_lms_tilde *x, t_floatarg f)
+{
+  x->adapt = (f==0) ? 0 : 1;
+}
+
+static void lms_tilde_geta(t_lms_tilde *x)
+{
+  if(x->adapt==0)
+    post("lms~: adaptation is currently OFF");
+  else
+    post("lms~: adaptation is currently ON");
+}
+
+static void lms_tilde_mu(t_lms_tilde *x, t_floatarg f)
+{
+  x->mu = f;
+}
+
+static void lms_tilde_getmu(t_lms_tilde *x)
+{
+  post("mu (step-size parameter): %f", x->mu);
+}
+
+static void lms_tilde_getN(t_lms_tilde *x)
+{
+  post("N (number of coefficients): %d", x->N);
+}
+
+static void lms_tilde_clear(t_lms_tilde *x)
+{
+  int i;
+  
+  // clear coefficients
+  for(i=0; i<x->N; i++)
+    x->c[i] = 0;
+  
+  // clear temp buffer
+  for(i=0; i<x->N-1; i++)
+    x->buf[i] = 0;
+}
+
+static void lms_tilde_init(t_lms_tilde *x)
+{
+  int i;
+  
+  // set the first coefficient to 1, all others to 0
+  // so this is a delay free transmission
+  x->c[0] = 1;
+  for(i=1; i<x->N; i++)
+    x->c[i] = 0;
+  
+  // clear temp buffers
+  for(i=0; i<x->N-1; i++)
+    x->buf[i] = 0;
+}
+
+static void lms_tilde_print(t_lms_tilde *x)
+{
+  int i;
+  
+  // print coefficients
+  post("\nNr. of coefficients: %d",x->N);
+  post("coefficients:");
+  for(i=0; i<x->N; i++)
+    post("\t%d: %f",i,x->c[i]);
+}
+
+static void lms_tilde_write(t_lms_tilde *x, t_symbol *s)
+{
+  // make correct path
+  char filnam[MAXPDSTRING];
+  char filename[MAXPDSTRING];
+  canvas_makefilename(x->x_canvas, s->s_name, filnam, MAXPDSTRING);
+  sys_bashfilename(filnam, filename);
+
+  // save to file
+  adaptation_write(filename, x->N, x->mu, x->c);
+}
+
+static void lms_tilde_read(t_lms_tilde *x, t_symbol *s)
+{
+  // make correct path
+  char filnam[MAXPDSTRING];
+  char filename[MAXPDSTRING];
+  canvas_makefilename(x->x_canvas, s->s_name, filnam, MAXPDSTRING);
+  sys_bashfilename(filnam, filename);
+  
+  // read file
+  adaptation_read(filename, &x->N, &x->mu, x->c, x->buf);
+}
+
+static t_int *lms_tilde_perform(t_int *w)
+{
+  t_lms_tilde *x = (t_lms_tilde *)(w[1]);
+  t_sample *x_ = (t_sample *)(w[2]);
+  t_sample *d_ = (t_sample *)(w[3]);
+  t_sample *y_ = (t_sample *)(w[4]);
+  int n = (int)(w[5]);
+  int i, j, tmp;
+  t_sample e=0;
+  
+  
+  for(i=0; i<n; i++)
+  {
+    // calc output (filter)
+    
+    x->tmp[i]=0;
+    
+    // y_[i] += x->c[j] * x_[i-j];
+    // so lets split in two halfs, so that
+    // negative indezes get samples from the
+    // last audioblock (x->buf) ...
+    tmp = (i+1 - x->N)*(-1);
+    tmp = tmp<0 ? 0 : tmp;
+    
+    for(j=0; j<x->N-tmp; j++)
+      x->tmp[i] += x->c[j] * x_[i-j];
+    
+    for(j=x->N-tmp; j<x->N; j++)
+      x->tmp[i] += x->c[j] * x->buf[(i-j)*(-1)-1];
+    
+    if(x->adapt)
+    {
+      // error computation
+      e = d_[i] - x->tmp[i];
+        
+      // coefficient adaptation
+      // (split in the same way as above)
+    
+      for(j=0; j<x->N-tmp; j++)
+        x->c[j] = x->c[j] + x->mu * x_[i-j] * e;
+    
+      for(j=x->N-tmp; j<x->N; j++)
+        x->c[j] = x->c[j] + x->mu * x->buf[(i-j)*(-1)-1] * e;
+    }
+    
+    //post("%d: in %f, d: %f, out: %f, error: %f, c1:%f, c2:%f", i, x_[i], d_[i], x->tmp[i], e, x->c[0], x->c[1]);
+  }
+
+  // store last samples for next audiobuffer
+  for(i=0; i<x->N-1; i++)
+    x->buf[i] = x_[n-1-i];
+  
+  // now write tmp to outlet
+  while(n--)
+    y_[n] = x->tmp[n];
+   
+  return (w+6);
+}
+
+static void lms_tilde_dsp(t_lms_tilde *x, t_signal **sp)
+{
+  // allocate new temp buffer if buffersize changes
+  if(x->bufsize != sp[0]->s_n)
+  {
+    if(sp[0]->s_n < x->N)
+      post("lms~ WARNING: buffersize must be bigger than N, you will get wrong results !!!");
+    
+    if(x->tmp) freebytes(x->tmp, sizeof(t_sample) * x->bufsize);
+    x->tmp = (t_sample *)getbytes(sizeof(t_sample) * sp[0]->s_n);
+    
+    x->bufsize =  sp[0]->s_n;
+  }
+
+  dsp_add(lms_tilde_perform, 5, x, sp[0]->s_vec, sp[1]->s_vec, 
+	  sp[2]->s_vec, sp[0]->s_n);
+}
+
+static void lms_tilde_helper(void)
+{
+  post("\nlms~: Adaptive transversal filter using LMS");
+  post("INPUT:");
+  post("\tinlet1: input signal x[n]");
+  post("\tinlet2: desired output signal d[n]");
+  post("\tinit_arg1: number of coefficients of the adaptive system");
+  post("\tinit_arg2, mu: step-size parameter (learning rate)");
+  post("OUTPUT:");
+  post("\toutlet1: output signal\n");
+}
+
+static void *lms_tilde_new(t_symbol *s, int argc, t_atom *argv)
+{
+  t_lms_tilde *x = (t_lms_tilde *)pd_new(lms_tilde_class);
+  int i;
+  
+  // default values:
+  x->N = 8;
+  x->mu = 0.05;
+  x->adapt = 0;
+  x->tmp = NULL;
+  x->bufsize = 0;
+  
+  switch(argc)
+  {
+    case 2:
+      x->mu = atom_getfloat(argv+1);
+    case 1:
+      x->N = atom_getint(argv);
+      x->N = (x->N<=0) ? 1 : x->N;
+  }
+  
+  // allocate mem and init coefficients
+  x->c = (t_float *)getbytes(sizeof(t_float) * x->N);
+  for(i=0; i<x->N; i++)
+    x->c[i] = 0;
+  
+  // allocate mem for temp buffer
+  x->buf = (t_sample *)getbytes(sizeof(t_sample) * x->N-1);
+  for(i=0; i<x->N-1; i++)
+    x->buf[i] = 0;
+  
+  inlet_new(&x->x_obj, &x->x_obj.ob_pd, &s_signal, &s_signal);
+  outlet_new(&x->x_obj, &s_signal);
+  x->x_canvas = canvas_getcurrent();
+
+  return (x);
+}
+
+static void lms_tilde_free(t_lms_tilde *x)
+{
+  if(x->c) freebytes(x->c, sizeof(t_float) * x->N);
+  if(x->buf) freebytes(x->buf, sizeof(t_sample) * x->N-1);
+  if(x->tmp) freebytes(x->tmp, sizeof(t_sample) * x->bufsize);
+}
+
+void lms_tilde_setup(void)
+{
+  lms_tilde_class = class_new(gensym("lms~"), (t_newmethod)lms_tilde_new, 
+                    (t_method)lms_tilde_free, sizeof(t_lms_tilde), 
+                    CLASS_DEFAULT, A_GIMME, 0);
+
+  class_addmethod(lms_tilde_class, (t_method)lms_tilde_a,
+                  gensym("adaptation"), A_DEFFLOAT, 0);
+  class_addmethod(lms_tilde_class, (t_method)lms_tilde_geta,
+                  gensym("getadaptation"), 0);
+  class_addmethod(lms_tilde_class, (t_method)lms_tilde_mu, 
+                  gensym("mu"), A_DEFFLOAT, 0);
+  class_addmethod(lms_tilde_class, (t_method)lms_tilde_getmu,
+                  gensym("getmu"), 0);
+  class_addmethod(lms_tilde_class, (t_method)lms_tilde_getN,
+                  gensym("getN"), 0);
+  class_addmethod(lms_tilde_class, (t_method)lms_tilde_init,
+                  gensym("init_unity"), 0);
+  class_addmethod(lms_tilde_class, (t_method)lms_tilde_clear,
+                  gensym("clear"), 0);
+  class_addmethod(lms_tilde_class, (t_method)lms_tilde_print,
+                  gensym("print"), 0);
+  class_addmethod(lms_tilde_class, (t_method)lms_tilde_write, 
+                  gensym("write"), A_DEFSYMBOL, 0);
+  class_addmethod(lms_tilde_class, (t_method)lms_tilde_read, 
+                  gensym("read"), A_DEFSYMBOL, 0);
+
+  class_addmethod(lms_tilde_class, (t_method)lms_tilde_dsp, gensym("dsp"), 0);
+  CLASS_MAINSIGNALIN(lms_tilde_class, t_lms_tilde, f);
+  
+  class_addmethod(lms_tilde_class, (t_method)lms_tilde_helper, gensym("help"), 0);
+}