From eecbd24f0f2df405b0a4dba4da1e2f0b3fb426d1 Mon Sep 17 00:00:00 2001
From: drowe67 <drowe67@01035d8c-6547-0410-b346-abe4f91aad63>
Date: Sun, 4 Oct 2009 10:06:51 +0000
Subject: [PATCH] 32 bit LSP difference split VQ, sounds OK over our small test
 database thru a loudspeaker

git-svn-id: https://svn.code.sf.net/p/freetel/code@71 01035d8c-6547-0410-b346-abe4f91aad63
---
 codec2/src/quantise.c       |   94 +++-
 codec2/src/sinedec.c        |    1 +
 codec2/unittest/genlsp.c    |   36 +-
 codec2/unittest/lspd123.txt | 1024 +++++++++++++++++++++++++++++++++++
 codec2/unittest/lspd456.txt | 1024 +++++++++++++++++++++++++++++++++++
 codec2/unittest/lspd78.txt  |   64 +++
 codec2/unittest/lspd910.txt |   64 +++
 7 files changed, 2277 insertions(+), 30 deletions(-)
 create mode 100644 codec2/unittest/lspd123.txt
 create mode 100644 codec2/unittest/lspd456.txt
 create mode 100644 codec2/unittest/lspd78.txt
 create mode 100644 codec2/unittest/lspd910.txt

diff --git a/codec2/src/quantise.c b/codec2/src/quantise.c
index f2e37c85..b9de0a1d 100644
--- a/codec2/src/quantise.c
+++ b/codec2/src/quantise.c
@@ -35,7 +35,7 @@
 #include <quant_lsp.h>
 
 #define MAX_ORDER    20
-#define LSP_DELTA1 0.05         /* grid spacing for LSP root searches */
+#define LSP_DELTA1 0.01         /* grid spacing for LSP root searches */
 #define MAX_CB       10         /* max number of codebooks */
 
 /* describes each codebook  */
@@ -48,27 +48,15 @@ typedef struct {
 
 /* lsp_q describes entire quantiser made up of several codebooks */
 
-//#define FIRST_ATTEMPT
-#ifdef FIRST_ATTEMPT
+/* 10+10+6+6 = 32 bit LSP difference split VQ */
 
 LSP_CB lsp_q[] = {
-    {2, 1024, "../unittest/lsp12_01.txt" },   /* LSP 1,2    */
-    {2,  512, "../unittest/lsp34_01.txt" },   /* LSP 3,4    */
-    {3,  512, "../unittest/lsp57_01.txt" },   /* LSP 5,6,7  */
-    {3,  512, "../unittest/lsp810_01.txt"},   /* LSP 8,9,10 */
+    {3,   1024, "../unittest/lspd123.txt"},
+    {3,   1024, "../unittest/lspd456.txt"},
+    {2,     64, "../unittest/lspd78.txt"},
+    {2,     64, "../unittest/lspd910.txt"},
     {0,    0, ""}
 };
-#else
-
-/* 10+10+8 = 28 bit LSP quantiser */
-
-LSP_CB lsp_q[] = {
-    {3, 1024, "../unittest/lsp123.txt" },   /* LSP 1,2,3     */
-    {4, 1024, "../unittest/lsp4567.txt" },  /* LSP 4,5,6,7   */
-    {3,  256, "../unittest/lsp8910.txt" },  /* LSP 8,9,10    */
-    {0,    0, ""}
-};
-#endif
 
 /* ptr to each codebook */
 
@@ -225,9 +213,10 @@ void quantise_init()
 
 \*---------------------------------------------------------------------------*/
 
-long quantise(float cb[], float vec[], int k, int m, float *se)
+long quantise(float cb[], float vec[], float w[], int k, int m, float *se)
 /* float   cb[][K];	current VQ codebook		*/
 /* float   vec[];	vector to quantise		*/
+/* float   w[];         weighting vector                */
 /* int	   k;		dimension of vectors		*/
 /* int     m;		size of codebook		*/
 /* float   *se;		accumulated squared error 	*/
@@ -243,7 +232,7 @@ long quantise(float cb[], float vec[], int k, int m, float *se)
    for(j=0; j<m; j++) {
 	e = 0.0;
 	for(i=0; i<k; i++)
-	    e += pow(cb[j*k+i]-vec[i],2.0);
+	    e += pow((cb[j*k+i]-vec[i])*w[i],2.0);
 	if (e < beste) {
 	    beste = e;
 	    besti = j;
@@ -268,6 +257,30 @@ void min_lsp_dist(float lsp[], int order)
 	    gmin = lsp[i]-lsp[i-1];
 }
 
+void check_lsp_order(float lsp[], int lpc_order)
+{
+    int   i;
+    float tmp;
+
+    for(i=1; i<lpc_order; i++)
+	if (lsp[i] < lsp[i-1]) {
+	    printf("swap %d\n",i);
+	    tmp = lsp[i-1];
+	    lsp[i-1] = lsp[i]-0.05;
+	    lsp[i] = tmp+0.05;
+	}
+}
+
+void force_min_lsp_dist(float lsp[], int lpc_order)
+{
+    int   i;
+
+    for(i=1; i<lpc_order; i++)
+	if ((lsp[i]-lsp[i-1]) < 0.01) {
+	    lsp[i] += 0.01;
+	}
+}
+
 /*---------------------------------------------------------------------------*\
 									      
   lpc_model_amplitudes
@@ -293,12 +306,15 @@ float lpc_model_amplitudes(
   int   i,j;
   float snr;	
   float lsp[MAX_ORDER];
+  float lsp_[MAX_ORDER];
+  float lspd[MAX_ORDER];
   int   roots;            /* number of LSP roots found */
   int   index;
   float se;
   int   l,k,m;
   float *cb;
-  
+  float wt[MAX_ORDER];
+
   for(i=0; i<M; i++)
     Wn[i] = Sn[i]*w[i];
   autocorrelate(Wn,R,M,order);
@@ -313,22 +329,50 @@ float lpc_model_amplitudes(
     if (roots != order)
 	printf("LSP roots not found\n");
 
+    lspd[0] = lsp[0];
+    for(i=1; i<order; i++)
+	lspd[i] = lsp[i] - lsp[i-1];
+    for(i=0; i<order; i++)
+	wt[i] = 1.0;
+
     i = 0; /* i-th codebook            */
     l = 0; /* which starts at l-th lsp */
     while(lsp_q[i].k) {
 	k = lsp_q[i].k;
 	m = lsp_q[i].m;
 	cb = plsp_cb[i];
-        index = quantise(cb, &lsp[l], k, m, &se);
-	for(j=0; j<k; j++)
-	    lsp[l+j] = cb[index*k+j];
+        index = quantise(cb, &lspd[l], wt, k, m, &se);
+
+	for(j=0; j<k; j++) 
+	    lspd[l+j] = cb[index*k+j];
+
+	/* compute quantised lsp so we can adjust for quantisation error
+	   below */
+
+	for(j=l; j<l+k; j++) {
+	    if (j==0)
+		lsp_[0] = lspd[0];
+	    else
+		lsp_[j] = lsp_[j-1] + lspd[j];
+	}
+
 	l += k;
 	assert(l <= order);
+
+	/* adjust next lspd to account for quantisation error */
+
+	lspd[l] = lsp[l] - lsp_[l-1];
+
 	i++;
 	assert(i < MAX_CB);
     }
     
-    lsp_to_lpc(lsp, &ak[1], order, NULL);
+    /* used during development: copy remaining LSPs from orig if we haven't
+       quantised all of them */
+    for(j=l; j<order; j++)
+	lsp_[j] = lsp[j];
+
+    lsp_to_lpc(lsp_, &ak[1], order, NULL);
     dump_lsp(lsp);
   }
 
diff --git a/codec2/src/sinedec.c b/codec2/src/sinedec.c
index 3785d916..0b7d83ba 100644
--- a/codec2/src/sinedec.c
+++ b/codec2/src/sinedec.c
@@ -284,6 +284,7 @@ int main(int argc, char *argv[])
     }    
   }
 
+  //printf("gmin = %f\n", get_gmin());
   if (fout != NULL)
     fclose(fout);
 
diff --git a/codec2/unittest/genlsp.c b/codec2/unittest/genlsp.c
index fc16e568..ae626315 100644
--- a/codec2/unittest/genlsp.c
+++ b/codec2/unittest/genlsp.c
@@ -35,10 +35,25 @@
 
 #include <stdio.h>
 #include <stdlib.h>
+#include <string.h>
 #include <math.h>
 #include "lpc.h"	/* LPC analysis functions 			*/
 #include "lsp.h"	/* LSP encode/decode functions 			*/
 
+int switch_present(sw,argc,argv)
+  char sw[];     /* switch in string form */
+  int argc;      /* number of command line arguments */
+  char *argv[];  /* array of command line arguments in string form */
+{
+  int i;       /* loop variable */
+
+  for(i=1; i<argc; i++)
+    if (!strcmp(sw,argv[i]))
+      return(i);
+
+  return 0;
+}
+
 int main(int argc, char *argv[]) {
     FILE   *fspc;	/* input file ptr for test database		*/
     FILE   *flsp;	/* output text file of LSPs 			*/
@@ -52,11 +67,12 @@ int main(int argc, char *argv[]) {
     int    i;
     int    roots;
     int    unstables;
+    int    lspd;
 
     /* Initialise ------------------------------------------------------*/
 
-    if (argc != 3) {
-	printf("usage: gentest RawFile LSPTextFile\n");
+    if (argc < 3) {
+	printf("usage: gentest RawFile LSPTextFile [--lspd]\n");
 	exit(0);
     }
 
@@ -74,6 +90,8 @@ int main(int argc, char *argv[]) {
 	exit(1);
     }
 
+    lspd = switch_present("--lspd", argc, argv);
+
     for(i=0; i<NW; i++)
 	Sn[i] = 0.0;
 
@@ -106,9 +124,17 @@ int main(int argc, char *argv[]) {
 	    find_aks(Sn, ak, NW, P, &Eres);
 	    roots = lpc_to_lsp(&ak[1], P , lsp, 5, LSP_DELTA1, NULL);
 	    if (roots == P) {
-		for(i=0; i<P; i++)
-		    fprintf(flsp,"%f ",lsp[i]);
-		fprintf(flsp,"\n");
+		if (lspd) {
+		    fprintf(flsp,"%f ",lsp[0]);
+		    for(i=1; i<P; i++)
+			fprintf(flsp,"%f ",lsp[i]-lsp[i-1]);
+		    fprintf(flsp,"\n");
+		}
+		else {
+		    for(i=0; i<P; i++)
+			fprintf(flsp,"%f ",lsp[i]);
+		    fprintf(flsp,"\n");
+		}
 	    }
 	    else 
 		unstables++;
diff --git a/codec2/unittest/lspd123.txt b/codec2/unittest/lspd123.txt
new file mode 100644
index 00000000..423871c6
--- /dev/null
+++ b/codec2/unittest/lspd123.txt
@@ -0,0 +1,1024 @@
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diff --git a/codec2/unittest/lspd456.txt b/codec2/unittest/lspd456.txt
new file mode 100644
index 00000000..4cc5ab8f
--- /dev/null
+++ b/codec2/unittest/lspd456.txt
@@ -0,0 +1,1024 @@
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diff --git a/codec2/unittest/lspd78.txt b/codec2/unittest/lspd78.txt
new file mode 100644
index 00000000..13ee29c3
--- /dev/null
+++ b/codec2/unittest/lspd78.txt
@@ -0,0 +1,64 @@
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diff --git a/codec2/unittest/lspd910.txt b/codec2/unittest/lspd910.txt
new file mode 100644
index 00000000..99c4b8d5
--- /dev/null
+++ b/codec2/unittest/lspd910.txt
@@ -0,0 +1,64 @@
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-- 
2.25.1