The Performance
by
Bruce Cornet, Ph.D.

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Page 11 of 15
Sound Profiles

Frequency spectrograms for the sounds of the Manta Ray (Figure 19 top right) contain multiple banded frequencies similar to the sound spectrogram of the FT (Figure 14). The spectrogram of the Manta Ray has a low profile similar to that of the French Aerospatiale Dauphin (Figure 14), but it differs significantly in its multibanded frequency composition. The most intense or loudest band of frequencies (primary sound) of the conventional jetliner (Figure 19, bottom right) ranges from about 388 kHz to 1421 kHz, whereas the loudest frequencies (the yellow-red zones) for the Manta Ray range from about 301 kHz to 904 kHz, and can be resolved into three frequency bands of 301 kHz, 560 kHz, and 904 kHz. The primary sound of the Manta Ray had a base 87 kHz lower and a top 517 kHz lower in pitch. In addition, the Manta Ray produced five additional frequency bands of higher pitch (1766, 2024, 2282, 2972, and 4350 kHz), whereas the conventional jetliner produced three nebulous bands above 904 kHz, with median frequencies at 2369 kHz, 2885 kHz, and 5642 kHz. It is as if the pilot of the Manta Ray was attempting to produce a synthetic sound similar to that of a conventional jetliner or C-5 military transport through the combining of separate frequencies. Even the wave forms for the sound from the two aircraft show a significant difference: The sound of the jetliner (Figure 19 bottom left) is much more jagged or less smooth than the sound of the Manta Ray (Figure 19 top left). That difference could be the result of synthetically or electronically generated sounds as opposed to true mechanical engine sounds. This does not mean that all the frequencies were synthetic. The high pitch turbine whine (Wav15b) may have indeed been the sound of an electrical generator cranking up rpms to produce enough juice for the plasma lights. But the significantly lower amount of white noise associated with the Manta Ray does imply at least some synthetic source, because the synthetic production of white noise over a wide range of frequencies requires an almost infinite number of frequency bands. The sound of the FT (Figure 14) may represent an attempt at producing a more naturally sounding jet-engine sound through the generation of over 15 closely spaced frequency bands. Even with those many bands, the top of the apparent white noise envelope only reaches 7-8 kHz, whereas on all the commercial and military jets the highest white noise frequencies usually range as high as 12 kHz, even for commercially reproduced and canned sound effects!

(Wav15b)

( Figure 14)

(Figure 19)

Why would the pilot of a stealth aircraft broadcast a synthetic jet-like sound? Because by doing so people will be distracted and confused by the sound, tending to want to think that it is the sound of a conventional jet. Even I have felt a sense of disappointment when an anomalous set of lights, at first approaching us low and silently, evolves into something that has running lights and produces sound like that of an airplane. It is only after I get back my photographs and analyze the video that I recognize or confirm movements that cannot be made by conventional aircraft. After the performance of the Manta Ray, Crystall, Pascorella, Joplin of Sightings, and the camera crew had a discussion about what each of them thought they saw and/or what they thought it might be. It became very clear to me that Joplin and the camera crew were in a state of confusion, this having been the first time they had been exposed to Pine Bush flying anomalies described by Crystall in her book. The first timers wanted to dismiss what they had just seen as a jetliner turning for an approach to Stewart airport 8.9 miles away, but had difficulty doing so based on my perception of the uncertainty in their voices and in what they said. It was the sound more than anything else that caused them the most problems. The opposite is also true: If the object produces no sound the observer will tend to think that it is not an aircraft if its shape or lighting is unfamiliar.

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