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.
--
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NJQRP/AMQRP, QRP ARCI, QCWA, FRC. ARRL SDR Wrk Grp Chairman
Laziness is the number one inspiration for ingenuity. Guilty as charged!
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