Results 251 to 260 of about 319,037 (305)
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Acoustic/underwater signaling device
The Journal of the Acoustical Society of America, 2008The present invention is concerned with an underwater communication device, and more specifically a device that is simple in design, is simple to operate, is powered solely by a simple pull from a swimmers or diver's hand against the resistance of a spring or elastic band, is extremely low maintenance, is resistant to accidental sound generation ...
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Acoustic Signalling in Female Fish
2015Sound production in female fish has only seldom been mentioned, which is in contrast to the vast literature on male sound production. This lack of information is surprising because sound-generating mechanisms are present in females of (almost) all vocal species.
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Acoustic signal producing apparatus
The Journal of the Acoustical Society of America, 2002An acoustic signal producing apparatus wherein various musical effects are applied to a musical tone signal and an acoustic signal respectively produced at an internal tone generator and supplied from an external device such as a microphone, an electronic musical instrument or the like in such a manner that an applying state of the musical effects can ...
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Underwater Acoustic Signal Processing
2007Abstract : The reports cover progress to develop a signal processing structure that exploits available knowledge of the environment and of signal and noise variability induced by the environment. The research is directed toward passive sonar detection and classification, continuous wave (CW) and broadband signals, shallow water operation, both platform-
David L. Bradley +2 more
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Journal of Ichthyology, 2009
The paper lists basic data on the role of sounds in fish behavior. The involvement of acoustic signaling in the control of reproductive, territorial, agonistic, aggressive, social, and feeding behavior in fish that differ in the systematics and mode of life is considered.
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The paper lists basic data on the role of sounds in fish behavior. The involvement of acoustic signaling in the control of reproductive, territorial, agonistic, aggressive, social, and feeding behavior in fish that differ in the systematics and mode of life is considered.
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Multichannel acoustic signal processing
2012Multichannel audio is necessary to enhance sound realism in a teleconferencing system. Sound spatialization to improve the quality of service can be achieved through the use of three-dimensional (3-D) audio systems. A 3-D audio system implemented using loudspeakers inherently suffers from the problem of acoustic crosstalk cancellation.
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Acoustic signal conditioning device
The Journal of the Acoustical Society of America, 1984An underwater acoustic array comprises an acoustic skirt baffle positioneddjacent to a hull surface for reducing the transmission of shipboard noise; an acoustic conditioning module positioned over the acoustic skirt baffle; and an outer layer secured to the acoustic conditioning module and containing a plurality of hydrophone units.
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Surface acoustic signal defader
The Journal of the Acoustical Society of America, 1981A surface acoustic signal defader for optimizing the signal received from underwater sound scattered from the ocean surface. The bandwidth of the underwater sound source is monitored and the frequency of maximum signal strength is identified. When the maximum signal strength frequency fades a predetermined amount, reception is switched to the signal of
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Acoustic signal enhancement system
The Journal of the Acoustical Society of America, 2006A signal enhancement system improves the quality of a noisy input signal. The system finds a low noise signal model which best matches the noisy input signal. Noisy portions of the input signal are replaced with portions of the low noise signal models.
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Acoustic signal processing apparatus
The Journal of the Acoustical Society of America, 1994An acoustic signal processing apparatus comprising infinite impulse response type digital filters and phase control device. The filters receive an acoustic signal. Outputs from the filters are synthesized to generate an output signal. The phase control device controls the phase of the output signals so as to cause limit cycle noise components generated
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