[NSRCA-discussion] S.bus

[Atwood, Mark]

It's a good question, but I think the base number starts at zero.  Meaning we're comparing NO latency with some latency.  I.e. 0 -11, or 0 - 14 or 0 - 250.    No delay is obviously the goal...though clearly impractical.   The question is at what point are we able to notice the latency.

I think the movie industry gives us a reasonable benchmark  to work with, in that movie frames are 30ms apart and we're generally unable to discern any break.   There are faster systems for film that with studies are considered "smoother" but I believe below 15ms there was little perceivable difference (that was 72FPS if I recall)

Time to go do some research...or not.



Mark Atwood
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From: nsrca-discussion-bounces at lists.nsrca.org [mailto:nsrca-discussion-bounces at lists.nsrca.org] On Behalf Of Bill's Email
Sent: Friday, July 09, 2010 12:01 PM
To: General pattern discussion
Subject: Re: [NSRCA-discussion] S.bus

The next question then becomes, at what level can we perceive a difference in performance? In other words, can we really perceive a difference between 7ms and 14ms latency? I will not argue that large differences are readily perceptible (25 versus 250), but what about smaller differences. How large of a difference does there need to be and is there a threshold below which it does not really matter?



Phil Spelt wrote:
As a Psychologist, I agree with you, Bill.  As an R/C pattern jockey, I will only point out that the electronic latency is ADDED TO the wet-ware latency...

Thus, your last statement is true, indeed!

At 11:19 AM 7/9/2010, you wrote:

I am amused by discussions about latency. We have long discussions about the perceived advantages of single digit differences in system latency while ignoring the fact that the average human reaction time (call it organic latency) is around 250 milliseconds.

I guess you can argue that since we are inherently so slow we need all the electronic help we can get!!





Jon Lowe wrote:

There is a great article on latency here:

http://www.rcmodelreviews.com/what_is_latency.shtml

A lot of people are hung up on transmitter/receiver latency numbers, and don't see the whole picture.  This gives as good a fact based write up as any I've seen.

Jon Lowe
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