alfie wrote:To think 3rd umpire should have given that one , as the quite significant , though not sharp , murmur came precisely as ball passed bat. Hard to see what else could have caused it at that exact moment - and certainly we've seen similar murmurs adjudged enough evidence in this series
I am not having a go at you Alfie, but discussions about the size or shape of the murmur shown on screen are the reason why we have so many problems. There really is no room for interpretation for anyone, its a completely binary decision. If there is a sound registered, its out. I dont care if its a barely detectable murmur, a big spike or the oscillator forms the shape on an elephant, the system is designed to detect a sound, the oscillator shows the sound... if it moves, its out. End of story.
The umpire has no right to make a judgement on the sound wave produced, because what he is seeing is not the sound of the edge; he is seeing the portion of the sound that has beaten the filter to block background noise out, the part of the sound that is unique to the edge. This could be anything, it depends on the sound. But in some cases what you might be left with is a unique frequency range at very low volume being the differentiator.... the resultant sound passing the filter barely registers, but its visible. People seem to think they need to see towering spikes or huge obvious sounds, I would guess because snicko has matured over the years and the waves you see are more heavily filtered and precise.
Think of it like a band. A bass drum and Bass Guitar tend to both be loudest around 80-100hz, with a chunky rhythm guitar also overlapping in the low to mid hz range. If you wanted to filter all the places these three instruments clash and hear the part unique to the drum, the resultant sound will be a white-noisey, barely registerable high-frequency click. It wont matter if the drummer is pounding the skin of his drum, the filter is removing all the loud parts and just returning the barely audible part of the sound that is unique.
There isn't really any reason why we even need to see the wave. Just pass the filtered sound through a noise gate that removes any sound at background levels, and hook it to a light that triggered when noise passes through. Does a red light turn on when the ball passes that bat? Yep... you gone.
I could design such a system in 3 minutes.
