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Rotating black holes, as defined by means of the Kerr space-time, are the most important to realizing the main violent and full of life phenomena within the Universe, from the middle cave in of huge supernova explosions generating strong bursts of gamma rays, to supermassive black gap engines that energy quasars and different lively galactic nuclei.
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5 Shaw’s data showing the ratio (in dB) of the sound pressure at the ear canal entrance to the free field sound pressure. The curves are the average of ten responses. 6 Shaw’s data showing the ratio (in dB) of the sound pressure at the ear canal entrance to the free field sound pressure. (a) shows the response for each of the ten subjects for a sound source of 0° azimuth. (b) shows the response for a sound source at 90° azimuth differences, and so forth, it would be almost absurd to expect that we all perceive the same balance of characteristics from any given sound.
Tests done on pure tones or speech frequently do not represent what occurs with musical sounds. Traditionally it has been the medical and communications industries that have funded much of the research into hearing. The fact that it is a different part of the brain which deals with musical perception to that which deals with speech and pure tones is often not realised. One should be very careful when attempting to apply known ‘facts’ about hearing to the subject of musical perception. They can often be very misleading.
It is thus the spacial equivalent of what frequency is in the time domain. It is rarely used by nonacademic acousticians, and is of little general use in the language of the studio world. Nevertheless, it exists in many text books, and so it is worth a mention, and helps once again to reinforce the concept of the relationship between sound and the world in which we live. So what has all of this got to do with recording studios? A lot. An awful lot! Sound, decibels and hearing 17 Sound is a wave motion in the air, and all wave motions, whether on the sea, through the earth (earthquakes), radio waves, light waves, or whatever else, follow many of the same universal physical laws.