Noise Blanker

Comments

• jks

  March 2017

  Probably. I haven't spent any time looking for noise blanker code (either pre or post-demodulation). This feature request has been on the list for a long time along with notch filter(s) for those annoying carriers.

  
  

  
• WA2ZKD

  March 2017

  Linrad has something worth a look. http://www.sm5bsz.com/linuxdsp/usage/newco/newcomer.htm#BLANKER

  
  

  
• f1jek

  May 2017 edited May 2017

  NB against PLC (Power Line Carrier), against the electric fence of the neighbour (cows)...
  
  A NB would be a veeeery good idea, as it exists for example ih HDSDR where it is very efficient, having no effect at all on the heared
  signal.
  
  J-Luc F1JEK
• KA7U

  May 2017

  For what it may be worth...
  

  
  

  http://www.sdradio.eu/weaksignals/winrad/download_source.html
  

  
  

  ron@linux-vxyy:~/Downloads/stuff> ls -l
  
  total 7008
  
  -rwxr-xr-x 1 ron users 3608776 Dec 22 22:56 TH-8600 .exe
  
  -rw-r--r-- 1 ron users 3558329 Apr 24 14:50 TH-8600.zip
  
  drwxr-xr-x 2 ron users    4096 May  7 18:42 Winrad_OpenSource_Part1
  
  drwxr-xr-x 5 ron users     218 May  7 18:43 Winrad_OpenSource_Part2
  
  ron@linux-vxyy:~/Downloads/stuff> grep -Ri noise *
  
  Winrad_OpenSource_Part1/Den1Adj.dfm:  Caption = '  Denoiser Level'
  
  Winrad_OpenSource_Part1/main.dfm:      Caption = 'Noise Blanker'
  
  Winrad_OpenSource_Part1/main.h: bool   DenoiserInitialized, fullview, wf1slow, overload, extLOchanged, LOlocked;
  
  Winrad_OpenSource_Part1/main.h: float  hibound, lobound, *cosval, freqerr, skew, Qmult, noiseReductionFactor, IQoffset;
  
  Winrad_OpenSource_Part1/main.h: void  __fastcall WideBandDenoiser(float *);
  
  Winrad_OpenSource_Part1/BlkAdj.cpp:// This routine manages the Noise Blanker slider
  
  Winrad_OpenSource_Part1/Den1Adj.cpp:// Thsi routine manages the Noise Reduction adjustment slider
  
  Winrad_OpenSource_Part1/Functions2.cpp:void  __fastcall TMainForm::WideBandDenoiser(float *FF2audio)
  
  Winrad_OpenSource_Part1/Functions2.cpp: if(!MainForm->DenoiserInitialized)
  
  Winrad_OpenSource_Part1/Functions2.cpp:    MainForm->DenoiserInitialized = true;
  
  Winrad_OpenSource_Part1/Functions2.cpp:    MainForm->DenoiserInitialized = false;
  
  Winrad_OpenSource_Part1/Functions2.cpp:            MainForm->DenoiserInitialized = false;
  
  Winrad_OpenSource_Part1/Functions2.cpp:    MainForm->DenoiserInitialized = false;
  
  Winrad_OpenSource_Part1/main.cpp:       DenoiserInitialized(false), nr(false), cwp(false), nblanker(false), perseus(false),
  
  Winrad_OpenSource_Part1/main.cpp:         DenoiserInitialized = false;
  
  Winrad_OpenSource_Part1/main.cpp:       DenoiserInitialized = false;
  
  Winrad_OpenSource_Part1/main.cpp:       DenoiserInitialized = false;
  
  Winrad_OpenSource_Part1/main.cpp:       DenoiserInitialized = false;
  
  Winrad_OpenSource_Part1/main.cpp:       DenoiserInitialized = false;
  
  Winrad_OpenSource_Part1/main.cpp:       DenoiserInitialized = false;
  
  Winrad_OpenSource_Part1/main.cpp:       DenoiserInitialized = false;
  
  Winrad_OpenSource_Part1/main.cpp:         if(mode != CW) return;       // Denoiser 2 is for CW only...
  
  Winrad_OpenSource_Part1/main.cpp:          case 0x12  : /* Ctrl-R => Noise Reduction */
  
  Winrad_OpenSource_Part1/main.cpp:                                         if(mode != CW) return;       // Denoiser 2 is for CW only...
  
  Winrad_OpenSource_Part1/main.cpp:          case 0x02  : /* Ctrl-B => NoiseBlanker */
  
  Winrad_OpenSource_Part1/ProcessIn.cpp:            else  // if paused clear the ASIO buffers to prevent noise
  
  Winrad_OpenSource_Part1/ProcessIn.cpp:  static SCplx AudioBuff[AFFTLEN], noiseMask[AFFTLEN];
  
  Winrad_OpenSource_Part1/ProcessIn.cpp:     MainForm->WideBandDenoiser(FF2audio);
  
  ron@linux-vxyy:~/Downloads/stuff>