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Old 03-22-2007, 05:17 PM
Randy Yates
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Default Re: What is real-time?

"Rune Allnor" <[email protected]> writes:

> On 22 Mar, 15:11, Randy Yates <y...@ieee.org> wrote:
>> "Rune Allnor" <all...@tele.ntnu.no> writes:
>> > On 22 Mar, 14:24, Randy Yates <y...@ieee.org> wrote:

>>
>> >> In my opinion any discussion of latency should be removed from the
>> >> definition of "real-time." These are two "orthogonal" concepts.

>>
>> > Interesting. Could you elaborate?

>>
>> A real-time system is a system that has a period and a well-defined
>> maximum amount of work to be done in that period and that can perform
>> that amount of work in that period.
>>
>> Latency is input to output delay.

>
> Ah, right. So a TV set is a real time system because of the
> frame rate, and all the work that needs to be done between
> frames. A satellite TV system is also restricted by the
> frame rate; the two-way travel time back and forth to the
> satellite doesn't affect that.


Precisely.

> Yes, I think you are right.


Thank you.
--
% Randy Yates % "Rollin' and riding and slippin' and
%% Fuquay-Varina, NC % sliding, it's magic."
%%% 919-577-9882 %
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