Jason DeCaires Taylor Underwater Sculpture from Christian Sandino-Taylor on Vimeo.
Saturday, October 10, 2009
Thursday, October 8, 2009
Points of interest:
1) "water, with or without contaminants such as air bubbles, is to some extent nonlinear. That is, the change in density caused by a change of pressure of a sound wave in water is not linearly proportional to the change in pressure... frequencies different from the input frequency occur at the output. For sinusoidal acoustic waves, a variety of additional frequencies in water are found to be generated"
(bold type and italics added; Urick, p.81)
(bold type and italics added; Urick, p.81)
Questions for my research topic...
Q1. What can we hear underwater? Are these sounds from the ocean(ambient sounds)?
Are these sounds man made?
Are they made by animals?
What effects what we hear underwater?
Do the surface of the sea and the seabed have an effect on what we hear? How do they effect what we hear?
Q2. How is sound propagated through the medium of water, in comparison with air?
What are the principles of sound propagation underwater?
Can these tell us what sounds we are likely to hear underwater? For example, the most prominent frequencies, amplitudes, timbre etc.
Q3. How do we hear underwater?
If we hear something through the medium of water, can we tell what it is in the same way that we could by hearing it through the medium of air?
How does water in the ear effect hearing?
Would an understanding of sound propagation in water and how we hear differently in water, then help us to learn how to determine different sounds underwater, that we would otherwise not be able to comprehend/make sense of?
Q4. What should be considered when recording underwater? What are the best techniques for recording?
Q5. How can we recreate this experience of underwater sounds, using the medium of air?
Are there methods of synthesis that might help?
What do divers experience/hear?
Q6. How can we "fix" recorded sounds, to sound best when put through the medium of water?
What principles should be considered/implemented for arranging sound or tampering with raw sound recordings?
Q7. How do we as humans effect marine life? How do we effect marine life navigation?
Q8. What don't we understand about the sea? In particular, sound in the sea, (for example, how whales hear - we assume that the frequency threshold of whales can be determined by the frequencies they produce, however, this is not certain - we do not know exactly what they can hear).
Could these phenomena be examined and used to recreate sound in a musical aesthetic?
Are these sounds man made?
Are they made by animals?
What effects what we hear underwater?
Do the surface of the sea and the seabed have an effect on what we hear? How do they effect what we hear?
Q2. How is sound propagated through the medium of water, in comparison with air?
What are the principles of sound propagation underwater?
Can these tell us what sounds we are likely to hear underwater? For example, the most prominent frequencies, amplitudes, timbre etc.
Q3. How do we hear underwater?
If we hear something through the medium of water, can we tell what it is in the same way that we could by hearing it through the medium of air?
How does water in the ear effect hearing?
Would an understanding of sound propagation in water and how we hear differently in water, then help us to learn how to determine different sounds underwater, that we would otherwise not be able to comprehend/make sense of?
Q4. What should be considered when recording underwater? What are the best techniques for recording?
Q5. How can we recreate this experience of underwater sounds, using the medium of air?
Are there methods of synthesis that might help?
What do divers experience/hear?
Q6. How can we "fix" recorded sounds, to sound best when put through the medium of water?
What principles should be considered/implemented for arranging sound or tampering with raw sound recordings?
Q7. How do we as humans effect marine life? How do we effect marine life navigation?
Q8. What don't we understand about the sea? In particular, sound in the sea, (for example, how whales hear - we assume that the frequency threshold of whales can be determined by the frequencies they produce, however, this is not certain - we do not know exactly what they can hear).
Could these phenomena be examined and used to recreate sound in a musical aesthetic?
Monday, October 5, 2009
Underwater Speaker - Can I make one?!
Commonly used piezo-electric speakers, such as those found in a cell phone, operate at low frequencies that human ears can hear.
cheap speaker?
cheap speaker?
21st-century form of Morse code
Scientists using laser light to generate underwater sound
WASHINGTON - The United States Naval Research Laboratory is working on a new technology that uses flashes of laser light to remotely create underwater sound.
Researchers behind the project say that the new technology has the potential to expand and improve both Naval and commercial underwater acoustic applications, including undersea communications, navigation, and acoustic imaging.
Dr. Ted Jones, a physicist in the Plasma Physics Division, is leading a team of researchers from the Plasma Physics, Acoustics, and Marine Geosciences Divisions in developing this acoustic source.
The researchers used a 532 nm laser pulse for their study at the Salt Water Tank Facility.
They also used air bubblers and controlled water and air temperatures to create ocean-like conditions in the laboratory.
The research team could efficiently convert light into sound by concentrating the light sufficiently to ionize a small amount of water, which then absorbed laser energy and superheats.
They said that the result was a small explosion of steam that could generate a 220 decibel pulse of sound.
Given that the driving laser pulse has the ability to travel through both air and water, the researchers say that a compact laser on either an underwater or airborne platform can be used for remote acoustic generation.
They believe that their method would be a significant addition to traditional direct backscattering acoustic data. (ANI)
WASHINGTON - The United States Naval Research Laboratory is working on a new technology that uses flashes of laser light to remotely create underwater sound.
Researchers behind the project say that the new technology has the potential to expand and improve both Naval and commercial underwater acoustic applications, including undersea communications, navigation, and acoustic imaging.
Dr. Ted Jones, a physicist in the Plasma Physics Division, is leading a team of researchers from the Plasma Physics, Acoustics, and Marine Geosciences Divisions in developing this acoustic source.
The researchers used a 532 nm laser pulse for their study at the Salt Water Tank Facility.
They also used air bubblers and controlled water and air temperatures to create ocean-like conditions in the laboratory.
The research team could efficiently convert light into sound by concentrating the light sufficiently to ionize a small amount of water, which then absorbed laser energy and superheats.
They said that the result was a small explosion of steam that could generate a 220 decibel pulse of sound.
Given that the driving laser pulse has the ability to travel through both air and water, the researchers say that a compact laser on either an underwater or airborne platform can be used for remote acoustic generation.
They believe that their method would be a significant addition to traditional direct backscattering acoustic data. (ANI)
Deep Sound Channel as Inspiration
FIU Music presents The Deep Seascape: the Sonic Sea, an acoustic performance that recreates the audio world 200 feet under the sea, off the coast of South Florida. The installation and performance, composed by music technology graduate student Erik DeLuca
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