Hello Martin,
Thanks for the explanation it's a lot to wrap around my small head.
<smile>
I certainly think I did read a lot of information on different frequencies
and such but the acronym through me off.
 Thanks.



 
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-----Original Message-----
From: For blind ham radio operators [mailto:[log in to unmask]]
On Behalf Of Martin McCormick
Sent: Tuesday, February 10, 2009 12:36 PM
To: [log in to unmask]
Subject: Re: Out of date

Karim Lakhani writes:
> sorry for the ignorance but what is DSP.
> I'm currently studying to get my license and this doesn't ring a bell 
> in the information I studied.

	I don't know if anybody answered this question off the list, but DSP
stands for Digital Signal Processing. In DSP, an audio or even an RF signal
is converted in to a stream of digits which represent the voltage levels and
polarities of the signal being processed at a given moment.

	As an example, compact disks are based on a stream of 44,200 16-bit
numbers per second for each audio channel. A 16-bit number has 65,536
possible values from 0 all the way up to 65,535. Those digits represent
voltages that range from no voltage at all up to whatever the full voltage
is for the system.

	A DSP device is a very fast computer that can take that bit stream
and process all those numbers in such a way as to achieve some particular
goal such as to remove noise or maybe to add an echo effect or even convert
tones in to computer data such as is what happens with modern decoders for
PSK31 or RTTy.

	Sorry for the long explanation, but DSP is not simple.

	I am kind of surprised that very basic DSP questions aren't in at
least the Extra Class test.

	While DSP applications are highly mathematical, the mechanics for
inputting signals in to a DSP device or converting those digits in to
meaningful signals are fairly easy to understand and appreciate.

Martin McCormick WB5AGZ  Stillwater, OK Systems Engineer OSU Information
Technology Department Telecommunications Services Group