To: | tentec@contesting.com |
---|---|
Subject: | Re: [TenTec] RE: DIgital Signal Processing |
From: | Martin Ewing <martin@aa6e.net> |
Reply-to: | tentec@contesting.com |
Date: | Mon, 16 Aug 2004 13:57:42 -0400 |
List-post: | <mailto:tentec@contesting.com> |
I think there is a useful distinction between the various CPUs, and it's
important for the Orion. TT doesn't tell us quite enough about the logical architecture of the Orion, but here's what I've learned so far. The "Sharc" DSP chips do the filtering, detection, and modulation. But the "Dragonball" processor (Mot 68000 family) handles the LCD, VFO control, the keyer (with jitter), serial I/O, and front panel functions. Most of the firmware problems seem to be in the Dragonball code. The interesting feature (for me) is that, while the control processor directs the DSP operation, the received audio/IF data are mostly not available to the control processor. (Excepting the spectrum display) This means, among other things, that the LCD can't show a tuning indicator (for FSK or PSK), can't show demodulated digital modes, etc. Also we can't show signal statistics that might help set up the digital AGC. Some of these functions are available in the IC-7800, and hopefully we will see them "trickle down" to us proletarian Orion users. (no flames, please!) I'd say that control processors, high-level signal processing (codecs), and the user interface is where the real innovation will be in the future, because RF and basic DSP are becoming commodities. Anyone agree with that? 73, Martin Merle Bone wrote: Mario, I really don't make much of a distinction between which of the CPUs are involved in performing the function digitally. While it is true that the general purpose processor has a different instruction set, it is still involved in digital control of the radio functions - part of digital signal processing. I recommend Doug Smith's book "Digital Signal Processing Technology." Doug was the main designer of the Orion. In his book he covers this by saying: _______________________________________________ TenTec mailing list TenTec@contesting.com http://lists.contesting.com/mailman/listinfo/tentec |
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