Results 251 to 260 of about 425,127 (302)

Underwater Acoustic Signal Processing

2007
Abstract : 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, Leon H. Sibul, Richard L. Culver   +2 more
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Acoustic signaling in fish

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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Multichannel acoustic signal processing

2012
Multichannel 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, 1984
An 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, 1981
A 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, 2006
A 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, 1994
An 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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Laser-Acoustic Signal Processing

IEEE Transactions on Industrial Electronics and Control Instrumentation, 1969
The variable delay and processing of RF and microwave signals is a current problem of considerable importance both for the many military applications in radar and electronic counter-measures and for the civilian applications in signal processing. The very low velocity of acoustic waves, as compared to the propagation velocity of electromagnetic signals,
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Acoustic Signals

2022
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Digitized acoustic radar signals

The Journal of the Acoustical Society of America, 1976
To study the atmospheric structure, a data acquisition system for the monostatic acoustic radar was developed. It allows the direct comparison to in situ and other remote measurements. The data acquisition system consists of a transient recorder, an interface and a magnetic tape recorder. The transient recorder digitizes and stores the signal.
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