kopia lustrzana https://github.com/jamescoxon/dl-fldigi
Gaussian Noise Generator
* Added Gaussian noise source with adjustable level in dB.
* Access requires command line switch --noise.
Controls appear on Configuration/Operator Tab.
* Not for use with transmitted signals, but for generating
an audio test file or testing with cross connected audio
cables between two computers.
* Modified modem decoders where necessary to level adjust
between transmit and receive s/n.
pull/2/head
David Freese
rodzic
d721d87a39
commit
f5d3e46607
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@ -86,6 +86,20 @@ static void cb_inpMyAntenna(Fl_Input2* o, void*) {
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progdefaults.changed = true;
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}
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Fl_Group *grpNoise=(Fl_Group *)0;
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Fl_Check_Button *btnNoiseOn=(Fl_Check_Button *)0;
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static void cb_btnNoiseOn(Fl_Check_Button* o, void*) {
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progdefaults.noise = o->value();
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}
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Fl_Counter *noiseDB=(Fl_Counter *)0;
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static void cb_noiseDB(Fl_Counter* o, void*) {
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progdefaults.s2n = o->value();
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}
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Fl_Group *tabUI=(Fl_Group *)0;
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Fl_Tabs *tabsUI=(Fl_Tabs *)0;
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@ -2438,6 +2452,27 @@ static const char szBaudRates[] = "300|600|1200|2400|4800|9600|19200|38400|57600
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inpMyAntenna->when(FL_WHEN_RELEASE);
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inpMyAntenna->labelsize(FL_NORMAL_SIZE);
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} // Fl_Input2* inpMyAntenna
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{ grpNoise = new Fl_Group(5, 203, 490, 165, _("Test Signal - Do NOT use with transmitter"));
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grpNoise->box(FL_ENGRAVED_FRAME);
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grpNoise->align(FL_ALIGN_TOP_LEFT|FL_ALIGN_INSIDE);
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grpNoise->hide();
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{ Fl_Check_Button* o = btnNoiseOn = new Fl_Check_Button(43, 241, 70, 15, _("Noise on"));
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btnNoiseOn->down_box(FL_DOWN_BOX);
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btnNoiseOn->callback((Fl_Callback*)cb_btnNoiseOn);
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o->value(progdefaults.noise);
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} // Fl_Check_Button* btnNoiseOn
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{ Fl_Counter* o = noiseDB = new Fl_Counter(40, 279, 89, 21, _("dB"));
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noiseDB->type(1);
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noiseDB->minimum(-18);
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noiseDB->maximum(60);
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noiseDB->step(1);
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noiseDB->value(20);
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noiseDB->callback((Fl_Callback*)cb_noiseDB);
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noiseDB->align(FL_ALIGN_LEFT);
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o->value(progdefaults.s2n);
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} // Fl_Counter* noiseDB
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grpNoise->end();
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} // Fl_Group* grpNoise
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tabOperator->end();
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} // Fl_Group* tabOperator
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{ tabUI = new Fl_Group(-3, 25, 508, 345, _("UI"));
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@ -2757,6 +2792,7 @@ static const char szBaudRates[] = "300|600|1200|2400|4800|9600|19200|38400|57600
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tabsWaterfall->color(FL_LIGHT1);
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tabsWaterfall->selection_color(FL_LIGHT1);
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{ Fl_Group* o = new Fl_Group(0, 50, 500, 320, _("Display"));
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o->hide();
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{ Fl_Group* o = new Fl_Group(5, 60, 490, 162, _("Colors and cursors"));
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o->box(FL_ENGRAVED_FRAME);
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o->align(FL_ALIGN_TOP_LEFT|FL_ALIGN_INSIDE);
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@ -2897,7 +2933,6 @@ static const char szBaudRates[] = "300|600|1200|2400|4800|9600|19200|38400|57600
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o->end();
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} // Fl_Group* o
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{ Fl_Group* o = new Fl_Group(0, 50, 500, 320, _("FFT Processing"));
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o->hide();
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{ Fl_Group* o = new Fl_Group(5, 62, 490, 135);
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o->box(FL_ENGRAVED_FRAME);
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{ Fl_Counter* o = cntLowFreqCutoff = new Fl_Counter(50, 72, 70, 20, _("Lower limit"));
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@ -3879,6 +3914,7 @@ an merging"));
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{ tabsRig = new Fl_Tabs(0, 25, 500, 345);
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tabsRig->selection_color(FL_LIGHT1);
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{ Fl_Group* o = new Fl_Group(0, 50, 500, 320, _("Hardware PTT"));
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o->hide();
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{ grpHWPTT = new Fl_Group(5, 100, 490, 265);
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grpHWPTT->box(FL_ENGRAVED_FRAME);
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{ inpTTYdev = new Fl_Input_Choice(200, 209, 160, 22, _("Device:"));
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@ -4057,7 +4093,6 @@ an merging"));
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o->end();
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} // Fl_Group* o
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{ tabHamlib = new Fl_Group(0, 50, 500, 320, _("Hamlib"));
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tabHamlib->hide();
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{ chkUSEHAMLIB = new Fl_Check_Button(195, 60, 100, 20, _("Use Hamlib"));
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chkUSEHAMLIB->tooltip(_("Hamlib used for rig control"));
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chkUSEHAMLIB->down_box(FL_DOWN_BOX);
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@ -4267,6 +4302,7 @@ an merging"));
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{ tabsSoundCard = new Fl_Tabs(0, 25, 500, 345);
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tabsSoundCard->selection_color(FL_LIGHT1);
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{ tabAudio = new Fl_Group(0, 50, 500, 320, _("Devices"));
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tabAudio->hide();
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{ AudioOSS = new Fl_Group(5, 60, 490, 45);
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AudioOSS->box(FL_ENGRAVED_FRAME);
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{ btnAudioIO[0] = new Fl_Round_Button(15, 70, 53, 25, _("OSS"));
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@ -4412,7 +4448,6 @@ ll with your audio device."));
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tabAudioOpt->end();
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} // Fl_Group* tabAudioOpt
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{ tabMixer = new Fl_Group(0, 50, 500, 320, _("Mixer"));
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tabMixer->hide();
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{ Fl_Group* o = new Fl_Group(5, 60, 490, 145, _("OSS mixer"));
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o->box(FL_ENGRAVED_FRAME);
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o->align(FL_ALIGN_TOP_LEFT|FL_ALIGN_INSIDE);
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@ -4580,6 +4615,7 @@ d frequency"));
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{ tabsMisc = new Fl_Tabs(0, 25, 500, 345);
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tabsMisc->selection_color(FL_LIGHT1);
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{ tabSweetSpot = new Fl_Group(0, 50, 500, 320, _("Sweet Spot"));
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tabSweetSpot->hide();
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{ Fl_Group* o = new Fl_Group(5, 60, 490, 75);
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o->box(FL_ENGRAVED_FRAME);
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o->align(FL_ALIGN_TOP_LEFT|FL_ALIGN_INSIDE);
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@ -4722,7 +4758,6 @@ d frequency"));
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tabCPUspeed->end();
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} // Fl_Group* tabCPUspeed
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{ tabFileExtraction = new Fl_Group(0, 50, 500, 320, _("Text Capture"));
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tabFileExtraction->hide();
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{ Fl_Group* o = new Fl_Group(5, 60, 490, 119, _("Auto Extract files from rx stream"));
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o->box(FL_ENGRAVED_FRAME);
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o->align(FL_ALIGN_TOP_LEFT|FL_ALIGN_INSIDE);
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@ -89,7 +89,7 @@ static const char szBaudRates[] = "300|600|1200|2400|4800|9600|19200|38400|57600
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} {
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Fl_Group tabOperator {
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label Operator
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callback {progdefaults.changed = true;} open selected
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callback {progdefaults.changed = true;} open
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xywh {0 25 500 345} when 1
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} {
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Fl_Group {} {
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@ -149,6 +149,23 @@ progdefaults.changed = true;}
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code0 {inpMyAntenna->labelsize(FL_NORMAL_SIZE);}
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class Fl_Input2
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}
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Fl_Group grpNoise {
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label {Test Signal - Do NOT use with transmitter} open selected
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xywh {5 203 490 165} box ENGRAVED_FRAME align 21 hide
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} {
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Fl_Check_Button btnNoiseOn {
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label {Noise on}
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callback {progdefaults.noise = o->value();}
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xywh {43 241 70 15} down_box DOWN_BOX
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code0 {o->value(progdefaults.noise);}
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}
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Fl_Counter noiseDB {
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label dB
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callback {progdefaults.s2n = o->value();}
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xywh {40 279 89 21} type Simple align 4 minimum -18 maximum 60 step 1 value 20
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code0 {o->value(progdefaults.s2n);}
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}
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}
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}
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Fl_Group tabUI {
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label UI open
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@ -533,7 +550,7 @@ progdefaults.changed = true;}
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} {
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Fl_Group {} {
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label Display open
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xywh {0 50 500 320}
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xywh {0 50 500 320} hide
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} {
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Fl_Group {} {
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label {Colors and cursors} open
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@ -717,7 +734,7 @@ progdefaults.changed = true;}
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}
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Fl_Group {} {
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label {FFT Processing} open
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xywh {0 50 500 320} hide
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xywh {0 50 500 320}
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} {
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Fl_Group {} {open
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xywh {5 62 490 135} box ENGRAVED_FRAME
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@ -1643,7 +1660,7 @@ progdefaults.changed = true;}
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} {
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Fl_Group {} {
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label {Hardware PTT} open
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xywh {0 50 500 320}
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xywh {0 50 500 320} hide
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} {
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Fl_Group grpHWPTT {open
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xywh {5 100 490 265} box ENGRAVED_FRAME
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@ -1922,7 +1939,7 @@ rigCAT_restore_defaults();}
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}
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Fl_Group tabHamlib {
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label Hamlib open
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xywh {0 50 500 320} hide
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xywh {0 50 500 320}
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} {
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Fl_Check_Button chkUSEHAMLIB {
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label {Use Hamlib}
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@ -2203,7 +2220,7 @@ progdefaults.changed = true;}
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} {
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Fl_Group tabAudio {
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label Devices open
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xywh {0 50 500 320}
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xywh {0 50 500 320} hide
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} {
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Fl_Group AudioOSS {open
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xywh {5 60 490 45} box ENGRAVED_FRAME
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@ -2374,7 +2391,7 @@ progdefaults.changed = true;}
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}
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Fl_Group tabMixer {
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label Mixer open
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xywh {0 50 500 320} hide
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xywh {0 50 500 320}
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} {
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Fl_Group {} {
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label {OSS mixer} open
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@ -2575,7 +2592,7 @@ progdefaults.changed = true;}
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} {
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Fl_Group tabSweetSpot {
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label {Sweet Spot} open
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xywh {0 50 500 320}
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xywh {0 50 500 320} hide
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} {
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Fl_Group {} {open
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xywh {5 60 490 75} box ENGRAVED_FRAME align 21
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@ -2730,7 +2747,7 @@ progdefaults.changed = true;}
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}
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Fl_Group tabFileExtraction {
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label {Text Capture} open
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xywh {0 50 500 320} hide
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xywh {0 50 500 320}
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} {
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Fl_Group {} {
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label {Auto Extract files from rx stream} open
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@ -135,6 +135,7 @@
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using namespace std;
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bool bWF_only = false;
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bool withnoise = false;
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Fl_Double_Window *fl_digi_main = (Fl_Double_Window *)0;
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Fl_Help_Dialog *help_dialog = (Fl_Help_Dialog *)0;
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@ -3500,6 +3501,8 @@ void create_fl_digi_main_primary() {
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wf->UI_select(progStatus.WF_UI);
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createConfig();
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if (withnoise)
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grpNoise->show();
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}
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void cb_mnuAltDockedscope(Fl_Menu_ *w, void *d);
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@ -3964,6 +3967,8 @@ void create_fl_digi_main_WF_only() {
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wf->UI_select(true);
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createConfig();
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if (withnoise)
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grpNoise->show();
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altTabs();
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}
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@ -510,7 +510,7 @@ void dominoex::synchronize()
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void dominoex::eval_s2n()
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{
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double s = pipe[pipeptr].vector[currsymbol].mag();
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double n = pipe[(pipeptr + symlen) % twosym].vector[currsymbol].mag();
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double n = (NUMTONES - 1 ) * pipe[(pipeptr + symlen) % twosym].vector[currsymbol].mag();
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sig = decayavg( sig, s, abs( s - sig) > 4 ? 4 : 32);
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noise = decayavg( noise, n, 64);
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@ -525,7 +525,7 @@ void dominoex::eval_s2n()
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display_metric(metric);
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snprintf(dommsg, sizeof(dommsg), "s/n %3.0f dB", s2n > 0 ? s2n : 0);
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snprintf(dommsg, sizeof(dommsg), "s/n %3.0f dB", s2n );
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put_Status1(dommsg);
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}
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@ -20,10 +20,14 @@ extern Fl_Input2 *inpMyName;
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extern Fl_Input2 *inpMyQth;
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extern Fl_Input2 *inpMyLocator;
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extern Fl_Input2 *inpMyAntenna;
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extern Fl_Group *grpNoise;
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#include <FL/Fl_Check_Button.H>
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extern Fl_Check_Button *btnNoiseOn;
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#include <FL/Fl_Counter.H>
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extern Fl_Counter *noiseDB;
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extern Fl_Group *tabUI;
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extern Fl_Tabs *tabsUI;
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extern Fl_Group *tabUserInterface;
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#include <FL/Fl_Check_Button.H>
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extern Fl_Check_Button *btnShowTooltips;
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extern Fl_Check_Button *chkMenuIcons;
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#include <FL/Fl_Choice.H>
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@ -90,7 +94,6 @@ extern Fl_Button *btnWaterfallFont;
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extern Fl_Check_Button *btnViewXmtSignal;
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#include <FL/Fl_Value_Slider.H>
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extern Fl_Value_Slider *valTxMonitorLevel;
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#include <FL/Fl_Counter.H>
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extern Fl_Counter *cntLowFreqCutoff;
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extern Fl_Counter *valLatency;
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extern Fl_Check_Button *btnWFaveraging;
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@ -38,6 +38,12 @@
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#endif
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#define CONFIG_LIST \
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ELEM_(bool, noise, "NOISETEST", \
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"Noise test on/off", \
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false) \
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ELEM_(double, s2n, "SIGNAL2NOISE", \
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"Signal to Noise ratio for test", \
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+20.0) \
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ELEM_(bool, rsidWideSearch, "RSIDWIDESEARCH", \
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"RSID detector searches the entire passband", \
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false) \
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@ -120,6 +120,7 @@ extern Fl_Button *btnAltMacros;
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extern Fl_Button *btnMacroTimer;
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extern bool bWF_only;
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extern bool withnoise;
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extern bool useCheckButtons;
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extern int altMacros;
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@ -170,6 +170,11 @@ public:
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void cwid_sendtext (const std::string& s);
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void cwid();
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// for noise tests
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private:
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void add_noise(double *, int);
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double sigmaN (double es_ovr_n0);
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double gauss(double sigma);
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};
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extern modem *cw_modem;
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13
src/main.cxx
13
src/main.cxx
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@ -475,6 +475,9 @@ void generate_option_help(void) {
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<< " --debug-level LEVEL\n"
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<< " Set the event log verbosity\n\n"
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<< " --noise\n"
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<< " unhide controls for noise tests\n\n"
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<< " --version\n"
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<< " Print version information\n\n"
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@ -564,7 +567,7 @@ int parse_args(int argc, char **argv, int& idx)
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#if USE_PORTAUDIO
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OPT_FRAMES_PER_BUFFER,
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#endif
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OPT_WO, OPT_DEBUG_LEVEL,
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OPT_WO, OPT_NOISE, OPT_DEBUG_LEVEL,
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OPT_EXIT_AFTER,
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OPT_DEPRECATED, OPT_HELP, OPT_VERSION, OPT_BUILD_INFO };
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@ -614,6 +617,7 @@ int parse_args(int argc, char **argv, int& idx)
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{ "exit-after", 1, 0, OPT_EXIT_AFTER },
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{ "wo", 0, 0, OPT_WO },
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{ "noise", 0, 0, OPT_NOISE },
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{ "debug-level", 1, 0, OPT_DEBUG_LEVEL },
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{ "help", 0, 0, OPT_HELP },
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@ -625,6 +629,8 @@ int parse_args(int argc, char **argv, int& idx)
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int longindex;
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optind = idx;
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int c = getopt_long(argc, argv, shortopts, longopts, &longindex);
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withnoise = false;
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switch (c) {
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case -1:
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@ -770,6 +776,11 @@ int parse_args(int argc, char **argv, int& idx)
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case OPT_WO:
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bWF_only = true;
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break;
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case OPT_NOISE:
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withnoise = true;
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break;
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case OPT_DEBUG_LEVEL:
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{
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int v = strtol(optarg, 0, 10);
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@ -650,13 +650,10 @@ void mfsk::afc()
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void mfsk::eval_s2n()
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{
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sig = pipe[pipeptr].vector[currsymbol].mag();
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noise = 0.0;
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for (int i = 0; i < numtones; i++) {
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if (i != currsymbol)
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noise += pipe[pipeptr].vector[i].mag();
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}
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noise = (numtones -1) * pipe[pipeptr].vector[prev2symbol].mag();
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if (noise > 0)
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s2n = decayavg ( s2n, sig / noise, 64 );
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}
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int mfsk::rx_process(const double *buf, int len)
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@ -233,9 +233,9 @@ int olivia::rx_process(const double *buf, int len)
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{
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int c;
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unsigned char ch = 0;
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double snr;
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// double snr;
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static char msg1[20];
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static char msg2[20];
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// static char msg2[20];
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if (tones != progdefaults.oliviatones ||
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bw != progdefaults.oliviabw ||
|
||||
|
|
@ -261,31 +261,38 @@ int olivia::rx_process(const double *buf, int len)
|
|||
Rx->Process(buf, len);
|
||||
|
||||
|
||||
bool gotchar = false;
|
||||
// bool gotchar = false;
|
||||
while (Rx->GetChar(ch) > 0) {
|
||||
if ((c = unescape(ch)) != -1 && c > 7) {
|
||||
put_rx_char(c);
|
||||
gotchar = true;
|
||||
// gotchar = true;
|
||||
}
|
||||
metric = clamp( 4 * Rx->SignalToNoiseRatio(), 0, 100);
|
||||
display_metric(metric);
|
||||
snprintf(msg1, sizeof(msg1), "f/o %+4.1f Hz", Rx->FrequencyOffset());
|
||||
put_Status1(msg1, 5, STATUS_CLEAR);
|
||||
}
|
||||
if (gotchar) {
|
||||
double noisepwr1 = wf->powerDensity((1.0 * frequency - Rx->Bandwidth / 2.0 - 100.0), 50.0),
|
||||
noisepwr2 = wf->powerDensity((1.0 * frequency + Rx->Bandwidth / 2.0 + 100.0), 50.0),
|
||||
noisepwr = 0,
|
||||
sigpwr = wf->powerDensity(1.0 * frequency, 1.0 * Rx->Bandwidth);
|
||||
noisepwr = noisepwr1 < noisepwr ? noisepwr1 : noisepwr2;
|
||||
if (noisepwr == 0) noisepwr = 1.0e-10;
|
||||
metric = decayavg( metric, sigpwr / noisepwr, 8);
|
||||
|
||||
snprintf(msg1, sizeof(msg1), "s/n %4.1f dB", 10.0 * log10(metric));
|
||||
put_Status1(msg1, 5, STATUS_CLEAR);
|
||||
// if (gotchar) {
|
||||
// float noisepwr1 = wf->powerDensity((1.0 * frequency - Rx->Bandwidth / 2.0 - 100.0), 1.0*bw/tones),
|
||||
// noisepwr2 = wf->powerDensity((1.0 * frequency + Rx->Bandwidth / 2.0 + 100.0), 1.0*bw/tones),
|
||||
// noisepwr = 0,
|
||||
// sigpwr = wf->powerDensity(1.0 * frequency, 1.0 * Rx->Bandwidth) / tones;
|
||||
|
||||
snprintf(msg2, sizeof(msg2), "f/o %+4.1f Hz", Rx->FrequencyOffset());
|
||||
put_Status2(msg2, 5, STATUS_CLEAR);
|
||||
// noisepwr = noisepwr1 < noisepwr2 ? noisepwr1 : noisepwr2;
|
||||
// if (noisepwr <= 0) noisepwr = 1e-9;
|
||||
// if (noisepwr > 0)
|
||||
// metric = decayavg( metric, sigpwr / noisepwr, 16);
|
||||
|
||||
snr = 3 * Rx->SignalToNoiseRatio();
|
||||
display_metric(snr > 100.0 ? 100.0 : snr );
|
||||
}
|
||||
// snprintf(msg1, sizeof(msg1), "s/n %4.1f dB", 10.0 * log10(metric));
|
||||
// put_Status1(msg1, 5, STATUS_CLEAR);
|
||||
|
||||
// snprintf(msg2, sizeof(msg2), "f/o %+4.1f Hz", Rx->FrequencyOffset());
|
||||
// put_Status2(msg2, 5, STATUS_CLEAR);
|
||||
|
||||
// snr = 4 * Rx->SignalToNoiseRatio();
|
||||
// display_metric(snr > 100.0 ? 100.0 : snr );
|
||||
// display_metric(clamp(4*Rx->SignalToNoiseRatio(), 0, 100);
|
||||
// }
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
|
|
|||
|
|
@ -473,13 +473,13 @@ void thor::synchronize()
|
|||
void thor::eval_s2n()
|
||||
{
|
||||
double s = pipe[pipeptr].vector[currsymbol].mag();
|
||||
double n = pipe[(pipeptr + symlen) % twosym].vector[currsymbol].mag();
|
||||
double n = (THORNUMTONES - 1) * pipe[(pipeptr + symlen) % twosym].vector[currsymbol].mag();
|
||||
|
||||
sig = decayavg( sig, s, s - sig > 0 ? 4 : 20);
|
||||
noise = decayavg( noise, n, 64);
|
||||
|
||||
if (noise)
|
||||
s2n = 20*log10(sig / noise) - 6;
|
||||
s2n = 20*log10(sig / noise);
|
||||
else
|
||||
s2n = 0;
|
||||
|
||||
|
|
@ -488,7 +488,7 @@ void thor::eval_s2n()
|
|||
|
||||
display_metric(metric);
|
||||
|
||||
snprintf(thormsg, sizeof(thormsg), "s/n %3.0f dB", s2n > 0 ? s2n : 0);
|
||||
snprintf(thormsg, sizeof(thormsg), "s/n %3.0f dB", s2n );
|
||||
put_Status1(thormsg);
|
||||
}
|
||||
|
||||
|
|
|
|||
|
|
@ -254,6 +254,84 @@ double modem::PTTnco()
|
|||
|
||||
mbuffer<double, 512 * 2, 2> _mdm_scdbl;
|
||||
|
||||
double modem::sigmaN (double es_ovr_n0)
|
||||
{
|
||||
double sn_ratio, sigma;
|
||||
double mode_factor = 0.707;
|
||||
switch (mode) {
|
||||
case MODE_CW:
|
||||
mode_factor /= 0.44;
|
||||
break;
|
||||
case MODE_FELDHELL: case MODE_SLOWHELL:
|
||||
case MODE_HELLX5: case MODE_HELLX9:
|
||||
mode_factor /= 0.22;
|
||||
break;
|
||||
case MODE_MT63_500: case MODE_MT63_1000: case MODE_MT63_2000 :
|
||||
mode_factor *= 3.0;
|
||||
break;
|
||||
case MODE_BPSK31: case MODE_PSK63: case MODE_PSK125: case MODE_PSK250: case MODE_PSK500:
|
||||
mode_factor *= 16;
|
||||
break;
|
||||
case MODE_QPSK31: case MODE_QPSK63: case MODE_QPSK125: case MODE_QPSK250:
|
||||
mode_factor *= 16;
|
||||
break;
|
||||
case MODE_THROB1: case MODE_THROB2: case MODE_THROB4:
|
||||
case MODE_THROBX1: case MODE_THROBX2: case MODE_THROBX4:
|
||||
mode_factor *= 6.0;
|
||||
break;
|
||||
// case MODE_RTTY:
|
||||
// case MODE_OLIVIA:
|
||||
// case MODE_DOMINOEX4: case MODE_DOMINOEX5: case MODE_DOMINOEX8:
|
||||
// case MODE_DOMINOEX11: case MODE_DOMINOEX16: case MODE_DOMINOEX22:
|
||||
// case MODE_MFSK4: case MODE_MFSK11: case MODE_MFSK22: case MODE_MFSK31:
|
||||
// case MODE_MFSK64: case MODE_MFSK8: case MODE_MFSK16: case MODE_MFSK32:
|
||||
// case MODE_THOR4: case MODE_THOR5: case MODE_THOR8:
|
||||
// case MODE_THOR11:case MODE_THOR16: case MODE_THOR22:
|
||||
// case MODE_FSKHELL: case MODE_FSKH105: case MODE_HELL80:
|
||||
default: break;
|
||||
}
|
||||
if (trx_state == STATE_TUNE) mode_factor = 0.707;
|
||||
|
||||
sn_ratio = pow(10, ( es_ovr_n0 / 10) );
|
||||
sigma = sqrt ( mode_factor / sn_ratio );
|
||||
return sigma;
|
||||
}
|
||||
|
||||
// A Rayleigh-distributed random variable R, with the probability
|
||||
// distribution
|
||||
// F(R) = 0 where R < 0 and
|
||||
// F(R) = 1 - exp(-R^2/2*sigma^2) where R >= 0,
|
||||
// is related to a pair of Gaussian variables C and D
|
||||
// through the transformation
|
||||
// C = R * cos(theta) and
|
||||
// D = R * sin(theta),
|
||||
// where theta is a uniformly distributed variable in the interval
|
||||
// 0 to 2 * Pi.
|
||||
|
||||
double modem::gauss(double sigma) {
|
||||
double u, r;
|
||||
u = 1.0 * rand() / RAND_MAX;
|
||||
r = sigma * sqrt( 2.0 * log( 1.0 / (1.0 - u) ) );
|
||||
u = 1.0 * rand() / RAND_MAX;
|
||||
return r * cos(2 * M_PI * u);
|
||||
}
|
||||
|
||||
// given the desired Es/No, calculate the standard deviation of the
|
||||
// additive white gaussian noise (AWGN). The standard deviation of
|
||||
// the AWGN will be used to generate Gaussian random variables
|
||||
// simulating the noise that is added to the signal.
|
||||
// return signal + noise, limiting value to +/- 1.0
|
||||
|
||||
void modem::add_noise(double *buffer, int len)
|
||||
{
|
||||
double sigma = sigmaN(progdefaults.s2n);
|
||||
double sn = 0;
|
||||
for (int n = 0; n < len; n++) {
|
||||
sn = (buffer[n] + gauss(sigma)) / (1.0 + 3.0 * sigma);
|
||||
buffer[n] = clamp(sn, -1.0, 1.0);
|
||||
}
|
||||
}
|
||||
|
||||
void modem::ModulateXmtr(double *buffer, int len)
|
||||
{
|
||||
if (progdefaults.PTTrightchannel) {
|
||||
|
|
@ -262,6 +340,7 @@ void modem::ModulateXmtr(double *buffer, int len)
|
|||
ModulateStereo( buffer, PTTchannel, len);
|
||||
return;
|
||||
}
|
||||
if (withnoise && progdefaults.noise) add_noise(buffer, len);
|
||||
try {
|
||||
unsigned n = 4;
|
||||
while (scard->Write(buffer, len) == 0 && --n);
|
||||
|
|
@ -290,6 +369,7 @@ void modem::ModulateXmtr(double *buffer, int len)
|
|||
using namespace std;
|
||||
void modem::ModulateStereo(double *left, double *right, int len)
|
||||
{
|
||||
if (withnoise && progdefaults.noise) add_noise(left, len);
|
||||
try {
|
||||
unsigned n = 4;
|
||||
while (scard->Write_stereo(left, right, len) == 0 && --n);
|
||||
|
|
@ -312,8 +392,6 @@ void modem::ModulateStereo(double *left, double *right, int len)
|
|||
_mdm_scdbl.next(); // change buffers
|
||||
}
|
||||
}
|
||||
// for (int i = 0; i < len; i++)
|
||||
// std::cout << (left[i] + 1.0) << "," << (right[i] - 1.0) << std::endl;
|
||||
}
|
||||
|
||||
|
||||
|
|
|
|||
Ładowanie…
Reference in New Issue