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Analyzing motorcycle low-frequency noise
Journal of Theoretical and Computational Acoustics, 2022This paper presents analyses of the 3D acoustic fields generated by motorcycles at very low frequencies ([Formula: see text] Hz) at the idle speed and during sudden acceleration. Diagnosis and analyses of sound sources at low frequencies have always been a significant challenge because the directivity of low-frequency sound is very poor.
Yazhong Lu +4 more
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Low-frequency noise thresholds
Journal of Sound and Vibration, 1969Abstract The absolute threshold of hearing for octave bands of noise with centre frequencies from 125 to 4 Hz has been determined. The results show that the noise threshold behaves in a similar fashion to the tone threshold, but below 32 Hz noise thresholds are more sensitive by a small but significant amount. A hypothesis is advanced that from about
N.S. Yeowart, M.E. Bryan, W. Tempest
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The Journal of the Acoustical Society of America, 1986
Since the classic paper of Wenz [J. Acoust. Soc. Am. 34, 1936 (1962)], ambient noise has been an extensively studied phenomena. Morris [SIO Ref. 75-34, MPL/Scripps (1975)] emphasized the importance of ships as their signals are enhanced when they cross over seamounts or proceed over the continential slopes. Wagstaff [J. Acoust. Soc. Am. 69, 1009 (1981)]
W. M. Carey, R. A. Wagstaff
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Since the classic paper of Wenz [J. Acoust. Soc. Am. 34, 1936 (1962)], ambient noise has been an extensively studied phenomena. Morris [SIO Ref. 75-34, MPL/Scripps (1975)] emphasized the importance of ships as their signals are enhanced when they cross over seamounts or proceed over the continential slopes. Wagstaff [J. Acoust. Soc. Am. 69, 1009 (1981)]
W. M. Carey, R. A. Wagstaff
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Europhysics Letters (EPL), 1986
At the nucleation stage of phase transformation, the number of critical nuclei is slowly fluctuating, which should lead to a characteristic, electrically detectable, low-f noise. Observation of this noise, which has a well-defined cut-off would provide an internal kinetic test of classical nucleation models.
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At the nucleation stage of phase transformation, the number of critical nuclei is slowly fluctuating, which should lead to a characteristic, electrically detectable, low-f noise. Observation of this noise, which has a well-defined cut-off would provide an internal kinetic test of classical nucleation models.
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An ultralow noise preamplifier for low frequency noise measurements
Review of Scientific Instruments, 2009Low frequency noise measurements are among the most sensitive tools for the investigation of the quality and of the reliability of semiconductor devices. The sensitivity that can be obtained depends on the background noise of the low noise preamplifier coupled to the device under test (DUT) that, at very low frequencies, is dominated by flicker noise ...
CANNATA', GIANLUCA +2 more
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Journal of Applied Physics, 1970
Variance fluctuations in 1/f noise examined with apparatus capable of responding to zero frequency signals are found to have the same magnitude as those in band-limited 1/f noise signals. The distribution of variances in identical sample lengths is skewed to small values in the case of current noise in a carbon resistor and is symmetrical in the case ...
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Variance fluctuations in 1/f noise examined with apparatus capable of responding to zero frequency signals are found to have the same magnitude as those in band-limited 1/f noise signals. The distribution of variances in identical sample lengths is skewed to small values in the case of current noise in a carbon resistor and is symmetrical in the case ...
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Japanese Journal of Applied Physics, 1990
Low-frequency noise measurements were carried out on GaAs devices in the frequency and temperature ranges from 10 Hz to 100 kHz, and from 77 K to 300 K, respectively. The noise spectra are considered to be superpositions of generation-recombination noise components caused by traps.
Shiyuan Yang +2 more
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Low-frequency noise measurements were carried out on GaAs devices in the frequency and temperature ranges from 10 Hz to 100 kHz, and from 77 K to 300 K, respectively. The noise spectra are considered to be superpositions of generation-recombination noise components caused by traps.
Shiyuan Yang +2 more
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Low-frequency noise around airports
The Journal of the Acoustical Society of America, 1998The sound frequency weighting PNdB has been proposed by Kryter (1959) to assess the noise from jet engine aircrafts. Due to the technical evolution of aircraft engines, and to choose a frequency weighting common to all transport systems, the dB(A-weighted) has begun to be used as the acoustical unit around airports; the PNdB is still used for noise ...
Michel Vallet, Jean Claude Bruyere
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Low-frequency noise spectroscopy
IEEE Transactions on Electron Devices, 1994Electrical noise in excess of thermal and shot noise is caused by imperfections in the device. Its control can improve the quality of the device and its measurement can give considerable information about the nature of the defects involved. For defects with discrete energy distributions spectroscopy can be used to identify the defect and measure its ...
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