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Re: [Discuss-gnuradio] bell 202 modulation
From: |
Eric Blossom |
Subject: |
Re: [Discuss-gnuradio] bell 202 modulation |
Date: |
Wed, 29 Mar 2006 14:07:06 -0800 |
User-agent: |
Mutt/1.5.9i |
On Wed, Mar 29, 2006 at 10:07:21PM +0200, Matteo Campanella wrote:
> yep, my fault to use the wrong name for it :-)
> I am indeed working on the bits to symbol (nrzi) block right now, and
> later on I am willing to do the HDLC block with flag, FCS and bit stuffing
> in order to put up the following chain:
>
> message_source->hdlc->nrzi->modulation->duc
>
> right now i am stuck at modulation, that is, to find a method to use the
> frequency modulator to do that at baseband, as suggested from Eric...
>
> 73, Matteo iz2eeq
A few more hints:
The sensitivity argument of the gr.frequency_modulator_fc is in
radians/sample/<input-units>. If your input data is +/- 1, then you
can produce two tones symmetrically around zero. Remember that this
is complex and hence -freq is distinguishable from +freq. Then just
translate the baseband up to the center frequency you like by
multiplying by a complex sinusoid (or let the usrp duc handle it).
Eric
- Re: [Discuss-gnuradio] bell 202 modulation, (continued)
- Re: [Discuss-gnuradio] bell 202 modulation, Eric Blossom, 2006/03/28
- Re: [Discuss-gnuradio] bell 202 modulation, Matteo Campanella, 2006/03/29
- Re: [Discuss-gnuradio] bell 202 modulation, Eric Blossom, 2006/03/29
- Re: [Discuss-gnuradio] bell 202 modulation, Robert McGwier, 2006/03/29
- Re: [Discuss-gnuradio] bell 202 modulation, Matteo Campanella, 2006/03/29
- Re: [Discuss-gnuradio] bell 202 modulation, Robert McGwier, 2006/03/29
- Re: [Discuss-gnuradio] bell 202 modulation, Matteo Campanella, 2006/03/29
- Re: [Discuss-gnuradio] bell 202 modulation, Gregg Levine, 2006/03/29
- Re: [Discuss-gnuradio] bell 202 modulation, John Ackermann N8UR, 2006/03/29
- Re: [Discuss-gnuradio] bell 202 modulation, Matteo Campanella, 2006/03/29
- Re: [Discuss-gnuradio] bell 202 modulation,
Eric Blossom <=
- Re: [Discuss-gnuradio] bell 202 modulation, Rick Parrish, 2006/03/29
- Re: [Discuss-gnuradio] bell 202 modulation, Eric Blossom, 2006/03/29
- Message not available
- [Discuss-gnuradio] Congress raises broadcast flag for audio, Steve Schear, 2006/03/29
Re: [Discuss-gnuradio] bell 202 modulation, Jeffrey Austen, 2006/03/28