Phase Locking of 2 sine sources

GNU Radio
1

Hi,

I was wondering how to lock 2 sinewaves in phase with grc.

The purpose is to build a descent mpx stereo decoder which locks a local
19khz sine to a bandpassed pilot of a mpx signal, which should improve
the
audioquality.

Thanks in advance…

2

Use a signal source to generate one, and connect this to a skiphead
block to generate the other. The skiphead will cause a set amount on
samples to be thrown out initially. That should give you two sinusoids
with a constant phase difference.

josh

3

-----Oorspronkelijk bericht-----
Van: discuss-gnu[email protected]
[mailto:discuss-gnu[email protected]]
Namens
Josh B.
Verzonden: dinsdag 26 oktober 2010 19:32
Aan: [email protected]
Onderwerp: Re: [Discuss-gnuradio] Phase Locking of 2 sine sources…

Use a signal source to generate one, and connect this to a skiphead
block to generate the other. The skiphead will cause a set amount on
samples to be thrown out initially. That should give you two sinusoids
with a constant phase difference.

josh

On 10/26/2010 03:17 AM, Jasper K. wrote:

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4

I guess this works with a “Known” source, but in this case the source
signal
varies in phase per transmitting station, and there is a need of a pll
like
circuit who catches the signal and locks this to the local generated
sine…

The mpx singal is fed through a bandpass filter with a low cutoff of
18.5khz
and a high cutoff of 19.5khz, the remaining pilot sine then needs to be
phase compared to a local 19khz source and locked…

I hope someone has a idea…

-----Oorspronkelijk bericht-----
Van: discuss-gnu[email protected]
[mailto:discuss-gnu[email protected]]
Namens
Josh B.
Verzonden: dinsdag 26 oktober 2010 19:32
Aan: [email protected]
Onderwerp: Re: [Discuss-gnuradio] Phase Locking of 2 sine sources…

Use a signal source to generate one, and connect this to a skiphead
block to generate the other. The skiphead will cause a set amount on
samples to be thrown out initially. That should give you two sinusoids
with a constant phase difference.

josh

On 10/26/2010 03:17 AM, Jasper K. wrote:

Discuss-gnuradio Info Page

Discuss-gnuradio mailing list
[email protected]
http://lists.gnu.org/mailman/listinfo/discuss-gnuradio