diff -Nupr src.p3/invf_est.c src.p4/invf_est.c
--- src.p3/invf_est.c	2010-10-21 13:06:37.000000000 +0300
+++ src.p4/invf_est.c	2010-10-21 13:06:37.000000000 +0300
@@ -29,11 +29,11 @@
 
 
 
-static float quantStepsSbr[4]  = {1, 10, 14, 19};
-static float quantStepsOrig[4] = {0,  3,  7, 10};
-static float nrgBorders[4] =     {25.0f, 30.0f, 35.0f, 40.0f};
+static const float quantStepsSbr[4]  = {1, 10, 14, 19};
+static const float quantStepsOrig[4] = {0,  3,  7, 10};
+static const float nrgBorders[4] =     {25.0f, 30.0f, 35.0f, 40.0f};
 
-static DETECTOR_PARAMETERS detectorParamsAAC = {
+static const DETECTOR_PARAMETERS detectorParamsAAC = {
     quantStepsSbr,
     quantStepsOrig,
     nrgBorders,
@@ -60,7 +60,7 @@ static DETECTOR_PARAMETERS detectorParam
 static const float hysteresis = 1.0f;
 
 
-static DETECTOR_PARAMETERS detectorParamsAACSpeech = {
+static const DETECTOR_PARAMETERS detectorParamsAACSpeech = {
     quantStepsSbr,
     quantStepsOrig,
     nrgBorders,
@@ -87,13 +87,13 @@ static DETECTOR_PARAMETERS detectorParam
 
 typedef const float FIR_FILTER[5];
 
-static FIR_FILTER fir_0 = { 1.0f };
-static FIR_FILTER fir_1 = { 0.3333333f, 0.6666666f };
-static FIR_FILTER fir_2 = { 0.125f, 0.375f, 0.5f };
-static FIR_FILTER fir_3 = { 0.0585786f, 0.2f, 0.3414214f, 0.4f };
-static FIR_FILTER fir_4 = { 0.0318305f, 0.1151638f, 0.2181695f, 0.3015028f, 0.3333333f };
+static const FIR_FILTER fir_0 = { 1.0f };
+static const FIR_FILTER fir_1 = { 0.3333333f, 0.6666666f };
+static const FIR_FILTER fir_2 = { 0.125f, 0.375f, 0.5f };
+static const FIR_FILTER fir_3 = { 0.0585786f, 0.2f, 0.3414214f, 0.4f };
+static const FIR_FILTER fir_4 = { 0.0318305f, 0.1151638f, 0.2181695f, 0.3015028f, 0.3333333f };
 
-static FIR_FILTER *fir_table[5] = {
+static const FIR_FILTER *fir_table[5] = {
   &fir_0,
   &fir_1,
   &fir_2,
diff -Nupr src.p3/invf_est.h src.p4/invf_est.h
--- src.p3/invf_est.h	2010-10-21 13:06:37.000000000 +0300
+++ src.p4/invf_est.h	2010-10-21 13:06:37.000000000 +0300
@@ -8,9 +8,9 @@
 
 typedef struct
 {
-  float *quantStepsSbr;
-  float *quantStepsOrig;
-  float *nrgBorders;
+  const float *quantStepsSbr;
+  const float *quantStepsOrig;
+  const float *nrgBorders;
   int   numRegionsSbr;
   int   numRegionsOrig;
   int   numRegionsNrg;
@@ -46,7 +46,7 @@ typedef struct
   int noDetectorBands;
   int noDetectorBandsMax;
 
-  DETECTOR_PARAMETERS *detectorParams;
+  const DETECTOR_PARAMETERS *detectorParams;
   INVF_MODE prevInvfMode[MAX_NUM_NOISE_VALUES];
   DETECTOR_VALUES detectorValues[MAX_NUM_NOISE_VALUES];
 
diff -Nupr src.p3/psy_configuration.c src.p4/psy_configuration.c
--- src.p3/psy_configuration.c	2010-10-21 13:06:37.000000000 +0300
+++ src.p4/psy_configuration.c	2010-10-21 13:06:37.000000000 +0300
@@ -23,7 +23,7 @@ static const float BARC_THR_QUIET[] = {1
 0.0f,  0.0f,  0.0f,  0.0f,  0.0f,  0.0f,  0.0f,  0.0f,  0.0f,  0.0f, 3.0f,  5.0f, 10.0f, 20.0f, 30.0f};
 
 
-static SFB_INFO_TAB sfbInfoTab[] ={
+static const SFB_INFO_TAB sfbInfoTab[] ={
   {11025, sfb_11025_long_1024, sfb_11025_short_128},
   {12000, sfb_12000_long_1024, sfb_12000_short_128},
   {16000, sfb_16000_long_1024, sfb_16000_short_128},