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Old 03-22-2007, 04:46 PM
Jerry Avins
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Default Re: What is real-time?

Rune Allnor wrote:
> On 22 Mar, 14:56, Jerry Avins <j...@ieee.org> wrote:
>> Randy Yates wrote:
>>
>> ...
>>
>>> In my opinion any discussion of latency ...

>> ... the term has gotten fuzzy. It has become a
>> synonym for "delay".

>
> Ah... forgive a non-native English speaker, but were the
> two terms ever *not* synonyms? Where is my dictionary,
> when I need it...


"Latent" means not visible or apparent; not yet manifest. Exposure in a
film camera creates a latent image, which becomes manifest when the film
is developed. "Latency" has a more restricted use in computer lingo, but
sot so restricted as to mean a fixed delay. The time from the assertion
of an interrupt to the interrupt routine's beginning is called
"interrupt latency". It is always a range, rather than a fixed time.
"Latency" is a fancy word with a fancy meaning. To refer to a simple
delay, "delay" is better.

Jerry
--
Engineering is the art of making what you want from things you can get.
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