Re: [Discuss-gnuradio] Stereo gain "hacked"

[Robert McGwier]

All:

I did deemphasis on Left  and Right and checked it in just now.  It is 
much better now.   Thanks for the links to the RDS stuff. I will take a 
look.

THANKS it already sounds much better.

Bob


al davis wrote:
> On Tuesday 14 February 2006 00:13, Robert McGwier wrote:
>   
> > But the COMPOSITE signal is what is
> > FM modulated but I bet they do not preemphasize the composite
> > signal. They might do preemphasis on the L+R baseband signal
> > as Matt suggests but I just don't know about the others.  I
> > am trying to understand what about that would make sense.  It
> > would be very interesting to read a real spec.  I have
> > googled and not really found one a  useful one.
> >     
>
> Preemphasis is done separately on left and right, before 
> encoding, with a 75 microsecond time constant, which gives a 
> corner at 2 KHz.   A simple RC network does the job.  Then in 
> the receiver, it is deemphasized after decoding, again with a 
> simple RC network, low pass with 75 microsecond time constant.
>
>
>   


--
AMSAT VP Engineering. Member: ARRL, AMSAT-DL, TAPR, Packrats,
NJQRP/AMQRP, QRP ARCI, QCWA, FRC. ARRL SDR Wrk Grp Chairman
Laziness is the number one inspiration for ingenuity.  Guilty as charged!