Engine Rev Changes - KERS?

[MattF1]

I'm still choked that we don't know.

TV Glitch means nothing unfortunately. A glitch to me is a one time event, not a consistent thing that happens on straights in Formula 1 car on board views.

It happens at each race, and all around the world on different networks, so it must be at the source, or at the satellite that relays the signal from the tracks.

So... this would mean that it is the equipment they use to broadcast the race. Now i doubt a professional trailer style mobile television studio would have a 'glitch' like that in their equipment.

So that leaves the camera in the car, and it's radio.

Based on this, I have a guess.

If there is a receiver on two points of the straight, which makes sense as it is the longest part of each track, it might be the car getting out of range of one receiver on the beginning of the straight, and entering the range of another at the end.

Maybe, just maybe, during the rerouting of the cars signal to the new receiver, there might be a buffer that has filled and needs to be unloaded, causing the time compression.

I make many assumptions in my idea, as I have no idea if there are multiple receivers or not, or just weird --- with the car we don't get.

I'm inclined to believe that your guess is correct, as sometimes the change in audio is accompanied by on screen artifacts, which would imply either a quick dip in signal, or a quick switch of signal sources - bearing in mind that the onboard system is quite compressed.

[Scotracer]

I put it down to the same issue as was found in 2006 onboard when they switched to the V8s:

[youtube]http://www.youtube.com/watch?v=h0OPQt01YtU[/youtube]

Listen just before Turn 1, after Turn 4, just after the Dunlop Hairpin and up the fast back kink, then before Turn 1 again the lap later. I believe it's just a mic issue - they got rid of that noise by 2007.

[blobslosak]

I didn't notice anything as obvious as what we're hearing on current onboards

[Giblet]

That noise could have been many things, but at least it appears easily explainable. Could be the mic, the extrememvibrations of the v8 at high revs, lots of things.

I'm going to write Mr. Matchett as he loves this kind of thing.

[Scotracer]

I didn't notice anything as obvious as what we're hearing on current onboards

The fast "rat-tat-tat" noise. That used to bug the hell out of me!

[Scania]

Again, Brawn cars make the same noise, without KERS.

Still unexplained.

so that I said this also sound provide while they change the fuel-air ratio

[Giblet]

Would a sudden, instant drop in revs, sustained, then followed by sudden, instant rise back up in revs mean:

A - would the car not suddenly lurch forward as if on the brakes if the engine speed actually dropped that much
B - if the clutch disengaged for the drop, again would not the car suddenly and obviously slow for a second, as this happens at top speed
C - if it is air/fuel ratio, does this mean the car can sustain it's high speed for a second as the revs drop?

I know it's been discussed a lot in other threads, including one I started, but never have I seen a proper answer explaining this phenom definitely.

If any bunch of people out there can sleuth it it is us.

[MattF1]

Anthony Davidson on radio 5 live just said that the sound is definitely not made by the cars, so it must be an audio problem.

[Giblet]

SOLVED!

(probably)

What I said earlier about transponders I now think is 99% true. The reason for this, is during Alonso's last televised lap on the straight, the sound issue was accompanied by a digital artifact on the screen. It was a green checkered bar that can be only described as compression, and it appeared 1 car length past the start finish, the same place the audio happens.

Their equipment did not do this last year. So they upgraded to worse gear?

I don't see HD coming anytime, ever.

[wip3out]

I have been watching the rpm leds on the steering wheel when this soundglitch happend and i cannot see an abnormal instant change, they are behaving normally.
I think its a audio video glitch!

[djos]

As I understand it, they are using digital transmitters on the cars now instead of analogue and as correctly surmised above the issue is caused by digital compression artifacts caused by the signal moving from receiver to receiver.

[turbineBill]

Maybe the engine is hitting the rev-limit due to bumps/oil on the road surface.
Rather than electronically limit power, it makes more sense to shift to a taller cog, thus reducing torque at the wheels, regaining traction.

[Giblet]

Maybe the engine is hitting the rev-limit due to bumps/oil on the road surface.
Rather than electronically limit power, it makes more sense to shift to a taller cog, thus reducing torque at the wheels, regaining traction.

NO

For the last time, it is not to do with the cars at all. It just isn't.

If you sat through all the frame by frame I did analyzing the glitches like I did, you would see that the audio glitch is in time with a video glitch, and it happens at the start/finish line.

It happens on the exact same place on the track, in different cars with and without KERS, and sound dips are only on the in car view, it can't be heard on the straights outside the car.

[Washngo]

I just do not see how KERS can be practical when the engine is near peak RPM. KERS does not posess enough power to drag the engine past it's limited RPM.
It's present application is for acceleration, getting a good launch out of corners. Not at the end of a straight.

True, and from next year (if the regs are pushed through), KERS will be disabled as soon as a car reaches 300km/h, meaning it will have to be used as an acceleration tool.

[mturda]

maybe audio is starting to get out of sync with video and they reset it on start/finish strait.