void eDVBFrontend::calculateSignalQuality(int snr, int &signalquality, int &signalqualitydb)
{
   int sat_max = 1600; // for stv0288 / bsbe2
   int ret = 0x12345678;
   int ter_max = 2900;
   int atsc_max = 4200;

   if (!strcmp(m_description, "AVL2108")) // ET9000
   {
      ret = (int)(snr / 40.5);
      sat_max = 1618;
   }
   if (!strcmp(m_description, "AVL6211")) // ET10000
   {
      ret = (int)(snr / 37.5);
      sat_max = 1700;
   }
   else if (strstr("Nova-T StickNovaT 500StickDTB03", m_description)) // dib0700
   {
      if ( snr > 300 )
         ret = 0; //error condition
      else
         ret = (int)(snr * 10);
   }
   else if (!strcmp(m_description, "BCM4501 (internal)"))
   {
      eDVBFrontendParametersSatellite parm;
      float SDS_SNRE = snr << 16;
      float snr_in_db;
      oparm.getDVBS(parm);

      if (parm.system == eDVBFrontendParametersSatellite::System_DVB_S) // DVB-S1 / QPSK
      {
         static float SNR_COEFF[6] = {
            100.0 / 4194304.0,
            -7136.0 / 4194304.0,
            197418.0 / 4194304.0,
            -2602183.0 / 4194304.0,
            20377212.0 / 4194304.0,
            -37791203.0 / 4194304.0,
         };
         float fval1 = 12.44714 - (2.0 * log10(SDS_SNRE / 256.0)),
                  fval2 = pow(10.0, fval1)-1;
         fval1 = 10.0 * log10(fval2);

         if (fval1 < 10.0)
         {
            fval2 = SNR_COEFF[0];
            for (int i=1; i<6; ++i)
            {
               fval2 *= fval1;
               fval2 += SNR_COEFF;
            }
            fval1 = fval2;
         }
         snr_in_db = fval1;
      }
      else
      {
         float fval1 = SDS_SNRE / 268435456.0,
               fval2, fval3, fval4;

         if (parm.modulation == eDVBFrontendParametersSatellite::Modulation_QPSK)
         {
            fval2 = 6.76;
            fval3 = 4.35;
         }
         else // 8PSK
         {
            fval1 *= 0.5;
            fval2 = 8.06;
            fval3 = 6.18;
         }
         fval4 = -10.0 * log10(fval1);
         fval1 = fval4;
         for (int i=0; i < 5; ++i)
            fval1 = fval4 - fval2 * log10(1.0+pow(10.0, (fval3-fval1)/fval2));
         snr_in_db = fval1;
      }
      sat_max = 1750;
      ret = (int)(snr_in_db * 100);
   }
   else if (strstr(m_description, "Alps BSBE1 C01A") ||
      strstr(m_description, "Alps -S(STV0288)"))
   {
      if (snr == 0)
         ret = 0;
      else if (snr == 0xFFFF) // i think this should not happen
         ret = 100*100;
      else
      {
         enum { REALVAL, REGVAL };
         const long CN_lookup[31][2] = {
            {20,8900}, {25,8680}, {30,8420}, {35,8217}, {40,7897},
            {50,7333}, {60,6747}, {70,6162}, {80,5580}, {90,5029},
            {100,4529}, {110,4080}, {120,3685}, {130,3316}, {140,2982},
            {150,2688}, {160,2418}, {170,2188}, {180,1982}, {190,1802},
            {200,1663}, {210,1520}, {220,1400}, {230,1295}, {240,1201},
            {250,1123}, {260,1058}, {270,1004}, {280,957}, {290,920},
            {300,890}
         };
         int add=strchr(m_description, '.') ? 0xA250 : 0xA100;
         long regval = 0xFFFF - ((snr / 3) + add), // revert some dvb api calulations to get the real register value
            Imin=0,
            Imax=30,
            i;
         if(INRANGE(CN_lookup[Imin][REGVAL],regval,CN_lookup[Imax][REGVAL]))
         {
            while((Imax-Imin)>1)
            {
               i=(Imax+Imin)/2;
               if(INRANGE(CN_lookup[Imin][REGVAL],regval,CN_lookup[REGVAL]))
                  Imax = i;
               else
                  Imin = i;
            }
            ret = (((regval - CN_lookup[Imin][REGVAL])
                  * (CN_lookup[Imax][REALVAL] - CN_lookup[Imin][REALVAL])
                  / (CN_lookup[Imax][REGVAL] - CN_lookup[Imin][REGVAL]))
                  + CN_lookup[Imin][REALVAL]) * 10;
         }
         else
            ret = 100;
      }
   }
   else if (!strcmp(m_description, "Alps BSBE1 702A") ||  // some frontends with STV0299
      !strcmp(m_description, "Alps -S") ||
      !strcmp(m_description, "Philips -S") ||
      !strcmp(m_description, "LG -S") )
   {
      sat_max = 1500;
      ret = (int)((snr-39075)/17.647);
   }
   else if (!strcmp(m_description, "Alps BSBE2"))
   {
      ret = (int)((snr >> 7) * 10);
   }
   else if (!strcmp(m_description, "Philips CU1216Mk3"))
   {
      eDVBFrontendParametersCable parm;
      int mse = (~snr) & 0xFF;
      oparm.getDVBC(parm);
      switch (parm.modulation)
      {
      case eDVBFrontendParametersCable::Modulation_QAM16: ret = fe_udiv(1950000, (32 * mse) + 138) + 1000; break;
      case eDVBFrontendParametersCable::Modulation_QAM32: ret = fe_udiv(2150000, (40 * mse) + 500) + 1350; break;
      case eDVBFrontendParametersCable::Modulation_QAM64: ret = fe_udiv(2100000, (40 * mse) + 500) + 1250; break;
      case eDVBFrontendParametersCable::Modulation_QAM128: ret = fe_udiv(1850000, (38 * mse) + 400) + 1380; break;
      case eDVBFrontendParametersCable::Modulation_QAM256: ret = fe_udiv(1800000, (100 * mse) + 40) + 2030; break;
      default: break;
      }
   }
   else if (!strcmp(m_description, "Philips TU1216"))
   {
      snr = 0xFF - (snr & 0xFF);
      if (snr != 0)
         ret = 10 * (int)(-100 * (log10(snr) - log10(255)));
   }
   else if (strstr(m_description, "Si2166B")) // DM7080HD/DM7020HD/DM820/DM800se DVB-S2 Dual NIM
   {
      ret = (snr * 240) >> 8;
   }
   else if (strstr(m_description, "BCM4506") || strstr(m_description, "BCM4505") || strstr(m_description, "BCM45208"))
   {
      ret = (snr * 100) >> 8;
   }
   else if (!strcmp(m_description, "ATBM781x"))
   {
      ret = snr*10;
   }
   else if (!strcmp(m_description, "Vuplus DVB-S NIM(AVL2108)")) // VU+Ultimo/VU+Uno DVB-S2 NIM
   {
      ret = (int)((((double(snr) / (65535.0 / 100.0)) * 0.1600) + 0.2100) * 100);
   }
   else if (!strcmp(m_description, "Vuplus DVB-S NIM(AVL6222)") || !strcmp(m_description, "Vuplus DVB-S NIM(AVL6211)") || !strcmp(m_description, "BCM7335 DVB-S2 NIM (internal)")) // VU+ DVB-S2 Dual NIM and VU+DUO DVB-S2 NIM
   {
      ret = (int)((((double(snr) / (65535.0 / 100.0)) * 0.1244) + 2.5079) * 100);
      if (!strcmp(m_description, "Vuplus DVB-S NIM(AVL6222)"))
         sat_max = 1490;
   }
   else if (!strcmp(m_description, "BCM7346 (internal)")) // MaxDigital XP1000
   {
      ret = (int)((((double(snr) / (65535.0 / 100.0)) * 0.1880) + 0.1959) * 100);
   }
   else if (!strcmp(m_description, "BCM7356 DVB-S2 NIM (internal)")) // VU+ Solo2
   {
      ret = (int)((((double(snr) / (65535.0 / 100.0)) * 0.1800) - 1.0000) * 100);
   }
   else if (!strcmp(m_description, "Vuplus DVB-S NIM(7376 FBC)")) // VU+ Solo4k
   {
      ret = (int)((((double(snr) / (65535.0 / 100.0)) * 0.1480) + 0.9560) * 100);
   }
   else if (!strcmp(m_description, "BCM7362 (internal) DVB-S2")) // Xsarius
   {
      ret = (int)((((double(snr) / (65535.0 / 100.0)) * 0.28) - 10.0) * 100);
   }
   else if (!strcmp(m_description, "DVB-S2 NIM(45208 FBC)"))
   {
      ret = (int)((((double(snr) / (65535.0 / 100.0)) * 0.1950) - 1.0000) * 100);
   }
   else if (!strcmp(m_description, "Genpix"))
   {
      ret = (int)((snr << 1) / 5);
   }
   else if (!strcmp(m_description, "CXD1981"))
   {
      eDVBFrontendParametersCable parm;
      int mse = (~snr) & 0xFF;
      oparm.getDVBC(parm);
      switch (parm.modulation)
      {
      case eDVBFrontendParametersCable::Modulation_QAM16:
      case eDVBFrontendParametersCable::Modulation_QAM64:
      case eDVBFrontendParametersCable::Modulation_QAM256: ret = (int)(-950 * log(((double)mse) / 760)); break;
      case eDVBFrontendParametersCable::Modulation_QAM32:
      case eDVBFrontendParametersCable::Modulation_QAM128: ret = (int)(-875 * log(((double)mse) / 650)); break;
      default: break;
      }
   }
   else if (!strcmp(m_description, "Broadcom BCM73XX") ||
          !strcmp(m_description, "FTS-260 (Montage RS6000)") ||
          !strcmp(m_description, "Panasonic MN88472") ||
          !strcmp(m_description, "Panasonic MN88473"))
   {
      ret = snr * 100 / 256;
      if (!strcmp(m_description, "FTS-260 (Montage RS6000)"))
         sat_max = 1490;
   }
   else if (!strcmp(m_description, "Si216x"))
   {
      eDVBFrontendParametersTerrestrial parm;

      oparm.getDVBT(parm);

      switch (parm.system)
      {
         case eDVBFrontendParametersTerrestrial::System_DVB_T:
         case eDVBFrontendParametersTerrestrial::System_DVB_T2:
         case eDVBFrontendParametersTerrestrial::System_DVB_T_T2: ret = (int)(snr / 58); ter_max = 1700; break;
         default: break;
      }
   }
   else if (strstr(m_description, "Sundtek DVB-T (III)")) // Sundtek MediaTV Digital Home III...dvb-t/t2 mode
   {
      ret = (int)(snr / 75);
      ter_max = 1700;
   }
   else if (strstr(m_description, "Sundtek DVB-S/S2 (IV)"))
   {
      ret = (int)(snr / 40.5);
      sat_max = 1900;
   }
   else if(!strcmp(m_description, "TBS-5925") || !strcmp(m_description, "DVBS2BOX") || !strcmp(m_description, "TechniSat USB device"))
   {
      ret = (snr * 2000) / 0xFFFF;
      sat_max = 2000;
   }
   else if (!strcmp(m_description, "Si21662"))
   {
      ret = (int)(snr / 46.;
      sat_max = 1620;
   }
   else if(!strcmp(m_description, "WinTV HVR-850") || !strcmp(m_description, "Hauppauge") || !strcmp(m_description, "LG Electronics LGDT3306A VSB/QAM Frontend"))
   {
      eDVBFrontendParametersATSC parm;
      oparm.getATSC(parm);
      switch (parm.modulation)
      {
      case eDVBFrontendParametersATSC::Modulation_QAM256: atsc_max = 4000; break;
      case eDVBFrontendParametersATSC::Modulation_QAM64: atsc_max = 2900; break;
      case eDVBFrontendParametersATSC::Modulation_VSB_8: atsc_max = 2700; break;
      default: break;
      }
      ret = snr * 10;
   }
   else if (!strcmp(m_description, "FTM-4862 (Availink AVL6862)")) // Osmega /S2/T2/C
   {
      int type = -1;
      oparm.getSystem(type);
      switch (type)
      {
         case feSatellite:
            ret = (snr + 2300) / 11.5;
            sat_max = 1550;
            break;
      }
   }
   else if (!strncmp(m_description, "Si216", 5)) // New models with SI tuners
   {
      ret = snr;
   }

   signalqualitydb = ret;
   if (ret == 0x12345678) // no snr db calculation avail.. return untouched snr value..
   {
      signalquality = snr;
   }
   else
   {