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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 20:58:58 -0800 |
User-agent: |
Mutt/1.5.9i |
On Wed, Mar 29, 2006 at 10:08:50PM -0600, Rick Parrish wrote:
> John Ackermann N8UR wrote:
>
> >the use of AFSK with 1200 and 2200Hz tones is simply an artifact of that.
>
> Instead of toggling back-and-forth between two independent tone sources,
> how hard would it be to create samples for a 1200 hz tone spanning one
> symbol period where the initial phase was arbitrary eg. if you used a
> sin(theta) function, it wouldn't always start at theta = 0. Same for the
> function to generate samples spanning one symbol period for the 2200 hz
> tone.
>
> The idea I'm getting at is you could have your signal transition
> smoothly (as possible) between the two tones which would result in a
> cleaner, more efficient signal.
>
> A sample rate that is an integer multiple of the symbol rate is a nice
> thing but isn't required.
>
> -rick
gr.frequency_modulator_fc will give you continuous phase.
Eric
- Re: [Discuss-gnuradio] bell 202 modulation, (continued)
- 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, 2006/03/29
- Re: [Discuss-gnuradio] bell 202 modulation, Rick Parrish, 2006/03/29
- Re: [Discuss-gnuradio] bell 202 modulation,
Eric Blossom <=
- 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