To: | tentec@contesting.com |
---|---|
Subject: | Re: [TenTec] RE: DIgital Signal Processing |
From: | Ken Brown <ken.d.brown@verizon.net> |
Reply-to: | tentec@contesting.com |
Date: | Mon, 16 Aug 2004 09:30:18 -1000 |
List-post: | <mailto:tentec@contesting.com> |
I think that there are some reasonable and logical distinctions that can
be made between digital control techniques and digital signal
processing. Most production radios have been using digital techniques
for controlling the function of a basically analog radio for many years
now. When an optical shaft angle encoder drives a microprocessor which
then controls a PLL to determine the local oscillator frequency of the
receiver, this is digital control, NOT DSP. When the received SIGNAL
gets DIGITIZED and PROCESSED DIGITALLY, this is DSP. Here is a contrived example of digital control versus digital signal processing: If the radio uses an up/down button to control the volume, and the microprocessor is controlling an analog attenuator in the audio path, this would be digital control, not DSP. If the radio uses an up/down button to control the volume, and the microprocessor is controlling the volume by performing an arithmetic function on a stream of bits that represent the audio, this would be DSP. From the outside of the box they appear the same. DE N6KB 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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