Rare floating error in IR ?

[ElizabethD]

No big deal as it's a rare event (perhaps this belongs in Software, but I don't think it's serious).
There's a recent file in Diagnosis
https://www.hifi-remote.com/forums/dload ... le_id=3401
related to Sporadic Success Learning Codes thread
https://www.hifi-remote.com/forums/viewtopic.php?t=6669

All I wanted to do is try to see how John can tell bad battery from movement and other causes. I didn't get there yet. Instead I bumped into an IR floating operation error message. Then, after I acknlowledged the error, moving along, up/down the list of signals, I noticed that the TV2 line got glued to the mouse pointer and was happily moving with it. It takes few clicks to unglue TV 2 from the mouse
Screen shots https://www.hifi-remote.com/forums/dload ... le_id=3404 but I can't show the mouse's arrow pointer with a little rectangle handle attached.

[johnsfine]

All I wanted to do is try to see how John can tell bad battery from movement and other causes.

Black magic, wild guesses, and a lot of experience. In this case I'm not too confident of my "bad batteries" diagnosis. I didn't do a very careful analysis.

The most common symptom of bad batteries is that individual ON durations are cut short, with the sum of ON and OFF unchanged. Worse batteries will skip ON durations entirely, merging them with the precceding and following OFF, again keeping the sum consistent. Worst batteries give you a single short ON at the beginning of frame, then nothing until the next frame.

Movement tends to loose the signal on a more macroscopic scale. So you can see near perfect bursts before the signal drops.

All of that should be used with a beter hypothisis of what the undamaged signals would have looked like. In the case mentioned, the good signals seemed to be a mix of NEC and Sony. I didn't check the bad ones well enough to even distinguish bad NEC from bad Sony.

[ElizabethD]

I forgot to say thanks - Rob no longer has a reminder in his signature
What you described about the signal lengths now makes perfect sense, thanks.