Results 301 to 310 of about 2,071,116 (352)
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Broadband noise modulation of multirotor aircraft
The Journal of the Acoustical Society of AmericaRotor broadband noise is typically analyzed over time scales encompassing multiple rotor periods. However, modulation of broadband noise levels with the blade passage frequency has been shown to be significant for human perception of wind turbine and helicopter noise. In contrast, broadband noise modulation has not been extensively studied for aircraft
Ze Feng (Ted) Gan +3 more
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Broadband reduction of quantum radiation pressure noise via squeezed light injection
Nature Photonics, 2018The Heisenberg uncertainty principle states that the position of an object cannot be known with infinite precision, as the momentum of the object would then be totally uncertain.
M. Yap +10 more
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Intensity resolution and loudness in broadband noise
The Journal of the Acoustical Society of America, 1995Intensity resolution and loudness matching behavior for pure tones was studied in quiet and in two levels of noise (15 and 40 dB spectrum level) to test the predictions of several models for relating these phenomena. Five normally hearing listeners participated.
R S, Schlauch, S, Harvey, N, Lanthier
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Sharpness and amplitude envelopes of broadband noise
The Journal of the Acoustical Society of America, 1990This paper discusses how amplitude envelope shapes, sound-pressure level, and duration of broadband noise affect sharpness and brightness. In the first experiment, sharpness, brightness, and similarity were judged for paired stimuli by 13 subjects. The stimuli consisted of broadband noise with different types of amplitude envelopes, sound-pressure ...
K, Ueda, M, Akagi
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Fundamental noise limits in broadband Raman amplifiers
OFC 2001. Optical Fiber Communication Conference and Exhibit. Technical Digest Postconference Edition (IEEE Cat. 01CH37171), 2001We show that broadband discrete Raman amplifiers based on silica-germania will have a noise figure significantly greater than the quantum limit. We also present temperature measurements on a broadband distributed Raman amplifier using asymmetrically-spaced pumps.
C.R.S. Fludger, V. Handerek, R.J. Mears
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Broadband NMR with random-window noise excitation
Journal of Magnetic Resonance, 2018Motivated by recent generations of compact portable and benchtop NMR instrumentation, we present a new method for the acquisition of broad bandwidth NMR spectra using stochastic excitation. The new method decouples the spectral width from the durations of the excitation pulses and ring-down delays, allowing the receiver bandwidth to be arbitrarily ...
Tian, Zhang, Carl A, Michal
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Low-noise broadband amplifiers
2016[No abstract available] Publisher's ...
Grebennikov, Andrei +2 more
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Active Control of Broadband Noise
2006 IEEE International Conference on Systems, Man and Cybernetics, 2006This paper investigates the performance of active control for broadband disturbance using maximum pressure minimization. The theory and simulations of active control using single-channel, two-channel and three-channel systems are presented. Constrained minimisation of the pressure is introduced, to achieve control over the pressure in both frequency ...
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Localization of aerial broadband noise by pinnipeds
The Journal of the Acoustical Society of America, 2004Although many pinnipeds (seals, sea lions, and walruses) emit broadband calls on land as part of their communication system, few studies have addressed these animals’ ability to localize aerial broadband sounds. In this study, the aerial sound localization acuities of a female northern elephant seal (Mirounga angustirostris), a male harbor seal (Phoca ...
Marla M, Holt +3 more
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Broadband self-noise from a ducted fan
AIAA Journal, 1998This paper describes the prediction of broadband self noise from ducted fans. The source mechanism is assumed to be the interaction of the turbulent boundary layer with the trailing edges of the fan blades. The source levels are obtained from the measurements of self noise from isolated blades by Brooks, Pope and Marcolini and these are corrected to ...
Stewart A. L. Glegg, Cyrille Jochault
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