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Is there an actual metric for how big a spike needs to be on snicko?

mr_mister

mr_mister

Cricket Web: All-Time Legend
Was just watching a T20 finals game between Hampshire and Lancashire, and There's a moment where a batsmen potentially feathers an edge to the keeper.

Onfield decision not out, players review, and at the moment the ball passes the bat, the snicko goes from a dead flat line to a sliiiight spike.

The commentators were going on about benefit of the doubt to the batsmen due to the onfield decision, how that slight spike wasn't conclusive, but is there an actual size the spike needs to be? Or is it just a bit of guess work? Because what could any spike in the line even be if not a nick? Wind?

Say what you want about Hawkeye, but at least it has a kind of.. exactness and accuracy about it
 
thierry henry

thierry henry

International Coach
At any given time there's going to be all sorts of noise going on, in particular noise associated with the batsman moving to play the shot. Does snicko actually differentiate between that noise, and specific "bat on ball" noise?

Or is just ALL MADE UP?
 
TheJediBrah

TheJediBrah

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thierry henry said:
At any given time there's going to be all sorts of noise going on, in particular noise associated with the batsman moving to play the shot. Does snicko actually differentiate between that noise, and specific "bat on ball" noise?

Or is just ALL MADE UP?
Click to expand...
How come that noise never shows up on snicko though? The microphones must be incredibly focused on just the area the ball travels








or it's all made up
 
Athlai

Athlai

Not Terrible
thierry henry said:
At any given time there's going to be all sorts of noise going on, in particular noise associated with the batsman moving to play the shot. Does snicko actually differentiate between that noise, and specific "bat on ball" noise?

Or is just ALL MADE UP?
Click to expand...
The soundwave wouldn't be the same. It'd be an extremely high peak for a very small amount of time. Nothing else the player is doing is going to give off the soundwave of a ball hitting a bat at 100kmh.

How they visualise it is probably all made up.
 
Spark

Spark

Global Moderator
So I'm very much still a signals processing neophyte but it wouldn't be that hard in principle to design a filter for it, right? They seem to deal with the sound in time "batches" or "gates" where, like, all the sounds in a certain interval of time - to match the camera frame rate I presume - are received and processed. The sound you're looking for a very short, sharp impulse, so the single you're looking for would have a very wide frequency bandwidth, so just filter out everything below a certain frequency and if what's left breaches your detection threshold during that "batch", there's your snick at least on the display.

Of course I'm sure actual audio/RF DSP people will come here and I say I'm talking complete **** but I think that sounds about right...?
 
R

RossTaylorsBox

Cricket Web: All-Time Legend
Athlai said:
How they visualise it is probably all made up.
Click to expand...
Yeah I think it's this. The lines the ump and audience look at is likely not the raw audio but been run through some algorithm which needs to be interpreted. Theoretically the lines could mean anything and we don't know either, so...


...it's all made up.
 
Daemon

Daemon

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