I did some more research (although I'm unsure about my ability to resolve
this on my own). Here's what I've found so far:
- the functioning of the standard_squelch depends on the audio_rate you set.
For the default 32kS/s it doesn't work, everything passes through, and
changing the threshold value does not seem to change anything.
- if you lower the audio rate, squelch does seem to work, though the output
is rather noisy
- looking at the underlying code, i notice that gr_threshold_ff.cc (used by
standard squelch) outputs
if (in[i] > d_hi) {
out[i] = 1.0;
while gr_simple_squelch_cc.cc outputs
if (f >= d_threshold)
out[i] = in[i];
I'm not sure if this is making the difference...
Can someone test and tell me if squelch works in the example
usrp/usrp_nbfm_ptt.py for them? Jonathan?
Thank you in advance for your help
Dimitris Symeonidis
"If you think you're too small to make a difference, try sleeping with a
mosquito!" - Amnesty International
On Fri, Sep 12, 2008 at 19:07, Dimitris Symeonidis <[EMAIL PROTECTED]>wrote:
> yes, it is. for now my programs work because i have replaced
> blks2.standard_squelch with gr.simple_squelch_cc, which works. I will
> investigate some more on monday and let you know.
>
> However the other issue (squelch_range) is obviously valid, no?
>
>
> On Fri, Sep 12, 2008 at 18:48, Johnathan Corgan <
> [EMAIL PROTECTED]> wrote:
>
>> On Tue, Sep 9, 2008 at 6:58 AM, Dimitris Symeonidis <[EMAIL PROTECTED]>
>> wrote:
>>
>> > We just realized that blks2.standard_squelch does not work since
>> GnuRadio
>> > 3.1.2. I installed 3.1.1 from source and it works fine, 3.1.2 and 3.1.3
>> it
>> > doesn't (basically everything passes through, independently of the
>> > threshold). We are using the usrp_nbfm_ptt.py (unchanged) from the
>> > gnuradio-examples. Anyone else notice this, or is it just our systems?
>>
>> Is this still an issue for you? I haven't looked at it, but it's on my
>> list.
>>
>> --
>> Johnathan Corgan
>> Corgan Enterprises LLC
>> http://corganenterprises.com/
>>
>
>
>
> --
> Dimitris Symeonidis
> "If you think you're too small to make a difference, try sleeping with a
> mosquito!" - Amnesty International
>
_______________________________________________
Discuss-gnuradio mailing list
Discuss-gnuradio@gnu.org
http://lists.gnu.org/mailman/listinfo/discuss-gnuradio
