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| author | Klaus Schmidinger <vdr@tvdr.de> | 2018-02-15 15:37:01 +0100 |
|---|---|---|
| committer | Klaus Schmidinger <vdr@tvdr.de> | 2018-02-15 15:37:01 +0100 |
| commit | a1c53eae1ef280faa9d534adec33babf2ded96d8 (patch) | |
| tree | d2604fdb18c6f08e774ea9dab724189b10352d8b /dvbdevice.c | |
| parent | a4343bdfd9e2f200bf89760f8eb45c56398bef67 (diff) | |
| download | vdr-a1c53eae1ef280faa9d534adec33babf2ded96d8.tar.gz vdr-a1c53eae1ef280faa9d534adec33babf2ded96d8.tar.bz2 | |
Improved calculating signal strength and quality (cont'd)
Diffstat (limited to 'dvbdevice.c')
| -rw-r--r-- | dvbdevice.c | 31 |
1 files changed, 25 insertions, 6 deletions
diff --git a/dvbdevice.c b/dvbdevice.c index a92aa70b..8710e775 100644 --- a/dvbdevice.c +++ b/dvbdevice.c @@ -4,7 +4,7 @@ * See the main source file 'vdr.c' for copyright information and * how to reach the author. * - * $Id: dvbdevice.c 4.15 2018/02/12 14:05:22 kls Exp $ + * $Id: dvbdevice.c 4.16 2018/02/15 15:37:01 kls Exp $ */ #include "dvbdevice.h" @@ -749,18 +749,37 @@ int StrengthToSSI(const cChannel *Channel, int Strength, int FeModulation, int F (prel < 35) ? (prel - 20) * 2 / 3 + 90 : // 90% - 100% 100; #ifdef DEBUG_SIGNALSTRENGTH - fprintf(stderr, "SSI: STR:%d, Pref:%d, Prel:%d, ssi:%d%%(sys:%d, mod:%d, fec:%d)\n", Strength, pref, prel, ssi, dtp.System(), mod, fec); + fprintf(stderr, "SSI-T: STR:%d, Pref:%d, Prel:%d, ssi:%d%%(sys:%d, mod:%d, fec:%d)\n", Strength, pref, prel, ssi, dtp.System(), mod, fec); +#endif + } + } + else if (Channel->IsCable()) { // ! COMPLETELY UNTESTED ! + // Formula: pref(dB) = -174.0 + NoiseFigure + SymRef + CnRef + // NoiseFigure = 6.5 dB; -> Tuner specific - range: 3.5 .. 9.0 dB + // SymRef = 10*log(6900000) = 68.5 dB; -> for Symbolrate of 6900 kSym/sec (TV: 6900, 6750 or 6111 kSym/sec) + // ==> pref(dB) = -174.0 + 6.5 + 68.5 + CnRef[modulation]{20,23,26,29,32}; (+/- 3 dB tuner specific) + if (mod == QAM_AUTO) mod = QAM_256; + // Q16 Q32 Q64 Q128 Q256 + int pref = REF_C1(-79, -76, -73, -70, -67); + if (pref) { + int prel = (Strength / 1000) - pref; + ssi = (prel < -15) ? 0 : + (prel < 0) ? (prel + 15) * 2 / 3 : // 0% - 10% + (prel < 20) ? prel * 4 + 10 : // 10% - 90% + (prel < 35) ? (prel - 20) * 2 / 3 + 90 : // 90% - 100% + 100; +#ifdef DEBUG_SIGNALSTRENGTH + fprintf(stderr, "SSI-C: STR:%d, Pref:%d, Prel:%d, ssi:%d%%(mod:%d)\n", Strength, pref, prel, ssi, mod); #endif } } - else if (Channel->IsCable()) - ssi = dB1000toPercent(Strength, -95000, -20000); // defaults else if (Channel->IsSat()) ssi = dB1000toPercent(Strength, -95000, -20000); // defaults return ssi; } -#define IGNORE_BER 0 +// Due to missing values or the different meanings of the reported error rate, ber_sqi is currently not taken into account +#define IGNORE_BER 1 #define BER_ERROR_FREE (1000*1000*1000) // 1/10^-9 int SignalToSQI(const cChannel *Channel, int Signal, int Ber, int FeModulation, int FeCoderateH, int FeFec) @@ -835,7 +854,7 @@ int SignalToSQI(const cChannel *Channel, int Signal, int Ber, int FeModulation, } } else if (Channel->IsCable()) { // ! COMPLETELY UNTESTED ! - if (mod == QAM_AUTO) mod = QAM_64; + if (mod == QAM_AUTO) mod = QAM_256; // 0.1 dB Q16 Q32 Q64 Q128 Q256 int cnref = REF_C1(200, 230, 260, 290, 320); // minimum for BER<10^-4 if (cnref) { |