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Re: [Discuss-gnuradio] Stereo gain "hacked"
From: |
Robert McGwier |
Subject: |
Re: [Discuss-gnuradio] Stereo gain "hacked" |
Date: |
Tue, 14 Feb 2006 00:51:11 -0500 |
User-agent: |
Thunderbird 1.5 (Windows/20051201) |
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!
- [Discuss-gnuradio] Stereo gain "hacked", Robert W McGwier, 2006/02/10
- Message not available
- Message not available
- Re: [Discuss-gnuradio] Stereo gain "hacked", n4hy, 2006/02/13
- Re: [Discuss-gnuradio] Stereo gain "hacked", Matt Ettus, 2006/02/13
- Re: [Discuss-gnuradio] Stereo gain "hacked", al davis, 2006/02/13
- Re: [Discuss-gnuradio] Stereo gain "hacked", Robert McGwier, 2006/02/14
- Re: [Discuss-gnuradio] Stereo gain "hacked", mgray, 2006/02/14
- Re: [Discuss-gnuradio] Stereo gain "hacked", al davis, 2006/02/14
- Re: [Discuss-gnuradio] Stereo gain "hacked",
Robert McGwier <=
- Re: [Discuss-gnuradio] Stereo gain "hacked", Lamar Owen, 2006/02/14