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Originally posted by DrZrD
First, I want to say that I am some what disappointed with the replies you received so far. Genuine scientific questions of importance have been asked yet most respondents can only make silly comments about X-Factor. Please allow me to get the scientific analysis you were seeking back on track.
I believe it is completely anomalous and unexpected that disparate sound systems should produce noises with many common characteristics and filling similar frequency ranges. If feedback oscillations are to blame (everyone has heard the screech from a microphone held too close to the speaker), then I would have expected the noise to mostly contain high frequency components instead of the low frequencies recorded.
I am also wondering why specific components that are always part of professional sound systems (such as the automatic oscillation compensator, 3 or 5 second audio delays, and dynamic range compressors) would not have automatically eliminated the condition causing the noise. Let me walk everyone through my thinking here.
Each component (i.e. microphone, amplifier, equalizer, etc.) within the sound system has a well defined operating frequency range. Typically, one component has a much narrower frequency bandwidth than all others and defines the response for the overall system. At the same time bandwidth is constrained within a component, the sound signal phase is shifted . We have all heard that awful screeching sound when a system oscillates. Sound systems oscillate at a specific frequency when the accumulated phase shift throughout the entire system, from microphone to speaker, at that frequency reaches 180 degrees. Why does a system usually screech at a high frequency? Because the majority of phase shift is added near the frequency limit of the component having the narrowest bandwidth; perhaps 15 kHz. What is so very strange about all of these noises captured is that the noise frequency is much lower a typical screech frequency. This suggests that the noise is not due to a feedback oscillation but the pickup of a rouge electrical signal.
The conjecture that these public address system noises are due to electrical pickup instead of feedback oscillation would also explain why audio time delays (almost certainly in use at the ball park) did not prevent the noise from occurring.
So what could it be? One way these noises could occur, IMO, is if huge currents flow through low level audio cable shields. Since no shielding is perfect, a small portion of the shield current noise gets added to the primary audio signal. How could these shield current form? Some unknown atmospheric or geophysical process causes a significant potential difference between each end of a long audio cable. Another possibility is direct interference with the radio signals linking wireless microphone technology. The true answer is illusive, but in all cases we are looking for an unexpected electro-magnetic phenomena.
To summarize, simple explanations for the unusual sounds do not stand up to close scrutiny. Considering that this appears to be a recent phenomena we should keep our eyes and ears open for more data points that could help unravel this mystery.
Originally posted by no special characters
You really just made me watch sheeple entertainment ?
Curse on you for believing this obviously staged "ghost theme".
Originally posted by TheLoneArcher
Staged. You could see the dramatic build up from the moment the girl made her announcement.
One thing Simon is good at is playing to the crowd.