Re: [Discuss-gnuradio] GRC + USRP2 + WBFM: synchronization problem?

[Nick Foster]

On Sun, 2011-04-03 at 08:48 +0200, Marcin Szelest wrote:
> Hello again,
> 
> 
> I've fixed sampling rate for 19kHz subcarier, but problem still existed.
> 
> I found that throttle connected between WBFM and USRP2 makes situation better.
> Now I have better quality, but some disortions are still audible.

This is a really good indication that your sample rates are off
somewhere. The throttle block should never be used when a hardware
interface is involved. Check your sample rate conversions.

--n

> 
> 
> Regards,
> Marcin
> 
> 
> 2011/3/30 Ed Criscuolo <address@hidden>:
> > Looks like you have your interpolator and your multiply blocks switched.
> >
> > The way you have it, the L-R audio is interpolated up to a 200k
> > sample rate, and then multiplied with a 19khz subcarrier at
> > a 44.1k sample rate.
> >
> > Do the multiply first, then interpolate the product.
> >
> > Or alternately,  simply change the 19 kHz sample rate to 200k.
> >
> > @(^.^)@  Ed
> 
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