Auto Squelch for FM

[vigeruno]

Hello.
A simple automatic squelch for FM.
Useful for those who listen to FM glsdr without getting a headache.

diff --git a/trunk/src/DttSP/fm_demod.c b/trunk/src/DttSP/fm_demod.c
index 7e8eecb..d4197d2 100644
--- a/trunk/src/DttSP/fm_demod.c
+++ b/trunk/src/DttSP/fm_demod.c
@@ -86,13 +86,14 @@ pll (FMD fm, COMPLEX sig)
void
FMDemod (FMD fm)
{

• int i;
• int i,mute;
  for (i = 0; i < CXBsize (fm->ibuf); i++)
  {
  pll (fm, CXBdata (fm->ibuf, i));
  fm->afc = (REAL) (0.9999 * fm->afc + 0.0001 * fm->pll.freq.f);

•   if (fm->afc < 0.000001){ mute = 0; } else { mute = 1; }
  CXBreal (fm->obuf, i) =
  

•       CXBimag (fm->obuf, i) = (fm->pll.freq.f - fm->afc) \* fm->cvt;
  

•       CXBimag (fm->obuf, i) = (fm->pll.freq.f - fm->afc) \* fm->cvt \* mute;
  

  }
  }

Regards.....

[alexlee188]

Are you sure that in:

• if (fm->afc < 0.000001){ mute = 0; } else { mute = 1; } CXBreal
  (fm->obuf, i) =
• CXBimag (fm->obuf, i) = (fm->pll.freq.f - fm->afc) * fm->cvt;
• CXBimag (fm->obuf, i) = (fm->pll.freq.f - fm->afc) * fm->cvt * mute;

You only want CXBimag(fm->obuf,i) to be 0? What about CXBreal(fm->obuf,i) ?

Alex

On Fri, Oct 28, 2016 at 7:03 PM, vigeruno [email protected] wrote:

Hello.
A simple automatic squelch for FM.
Useful for those who listen to FM glsdr without getting a headache.

diff --git a/trunk/src/DttSP/fm_demod.c b/trunk/src/DttSP/fm_demod.c
index 7e8eecb..d4197d2 100644
--- a/trunk/src/DttSP/fm_demod.c
+++ b/trunk/src/DttSP/fm_demod.c
@@ -86,13 +86,14 @@ pll (FMD fm, COMPLEX sig)
void
FMDemod (FMD fm)
{

• int i;
• int i,mute; for (i = 0; i < CXBsize (fm->ibuf); i++) { pll (fm,
  CXBdata (fm->ibuf, i)); fm->afc = (REAL) (0.9999 * fm->afc + 0.0001 *
  fm->pll.freq.f);
• if (fm->afc < 0.000001){ mute = 0; } else { mute = 1; } CXBreal
  (fm->obuf, i) =
• CXBimag (fm->obuf, i) = (fm->pll.freq.f - fm->afc) * fm->cvt;
• CXBimag (fm->obuf, i) = (fm->pll.freq.f - fm->afc) * fm->cvt * mute;
  } }

Regards.....

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[vigeruno]

Hello.
Yes.

https://github.com/vigeruno/ghpsdr3-vigeruno/blob/master/trunk/src/DttSP/fm_demod.c
You can listen live on ik6fjn ik6ioq server glsdr or qtradio

Regards.....

[alexlee188]

Ok I see :)

I have updated the repo with a slight change. Please test.

On Fri, 28 Oct, 2016 8:51 pm vigeruno, [email protected] wrote:

Hello.
[image: schermata del 2016-10-28 14-47-38]
https://cloud.githubusercontent.com/assets/22787199/19806900/d5562944-9d1d-11e6-863f-60729ce6ab7a.png

https://github.com/vigeruno/ghpsdr3-vigeruno/blob/master/trunk/src/DttSP/fm_demod.c

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[vigeruno]

Hello.

It works with this change:
if (fm->afc < 0.000001){ mute = 1; } else { mute = 0; } yes
if (fm->afc < 0.000001){ mute = 0; } else { mute = 1; } not working

Regards.....

[alexlee188]

Ok. Corrected.

On Sun, 30 Oct, 2016 1:51 am vigeruno, [email protected] wrote:

Hello.

It works with this change:
if (fm->afc < 0.000001){ mute = 1; } else { mute = 0; } yes
if (fm->afc < 0.000001){ mute = 0; } else { mute = 1; } not working
[image: autosquelch]
https://cloud.githubusercontent.com/assets/22787199/19831682/6ec01502-9e10-11e6-8c73-53b6400e50f6.png
[image: pollice_alto]
https://cloud.githubusercontent.com/assets/22787199/19831706/ef2c3f68-9e10-11e6-9ad2-e87dbc767db1.jpeg

Regards.....

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