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Background noise

About: Background noise is a research topic. Over the lifetime, 12671 publications have been published within this topic receiving 219820 citations. The topic is also known as: ambient noise.


Papers
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Proceedings ArticleDOI
01 Aug 2019
TL;DR: Simulation results show the algorithm remains available in quite a low signal-to-noise (SNR) with low complexity and fine detection performance in -18dB condition, which can meet the demand of electronic reconnaissance.
Abstract: In response to the problem of weak chirp signal detection, a method based on Short-time Fourier transform (STFT) and cubic spline interpolation is proposed. The scheme mainly exploits the continuous time-frequency characteristic of chirp signals to extract them from background noise. To be specific, we short-time Fourier transform the input signals into coherent integration of frequency-shift sample sequences which are with complex envelopes, then achieve a time-frequency curve and numerically analyze it with cubic spline interpolation, in order to eliminate the noise to the utmost extent as well as to detect chirp signals effectively. The algorithm remains available in quite a low signal-to-noise (SNR) with low complexity. Simulation results show its fine detection performance in -18dB condition, which can meet the demand of electronic reconnaissance.

1 citations

Journal ArticleDOI
TL;DR: In this paper, a procedure is developed for classifying common background noises, from which a parameter vector describing the spectral shape and the temporal envelope fluctuations is extracted, and individual 200-ms noise parameter vectors are then assigned to the cluster having the nearest centroid, and performance results are presented in terms of the percent of noises correctly classified.
Abstract: As a first step in designing an automatic hearing‐aid adjustment system, a procedure is being developed for classifying common background noises. The intelligibility and quality of amplified speech depend on the type and level of the background noise as well as on the individual hearing loss. Thus to realize the maximum benefit from a hearing aid, the frequency response and processing characteristics should be set according to the type of background noise, and should change as the noise changes. The noise‐classification procedure used 200‐ms segments of noise, from which a parameter vector describing the spectral shape and the temporal envelope fluctuations is extracted. Parameter vectors for the different noises, averaged over 2 s of data, have been subjected to a cluster analysis to measure their similarity. Individual 200‐ms noise parameter vectors are then assigned to the cluster having the nearest centroid, and performance results will be presented in terms of the percent of noises correctly classified. [Work supported by NIDCD.]

1 citations

Patent
03 Dec 2014
TL;DR: In this article, the authors proposed a method and a system for setting a mute threshold of a civil aviation receiver, which comprises the steps of acquiring noise signals inside the receiver, and acquiring a background noise correction coefficient according to the inside noise signals; acquiring calibrating signals received by the receiver; and setting the muted threshold of the receiver according to background noise corrected coefficient and the quality information correction coefficient.
Abstract: The invention provides a method and a system for setting a mute threshold of a civil aviation receiver. The method comprises the steps of acquiring noise signals inside the receiver, and acquiring a background noise correction coefficient according to the inside noise signals; acquiring calibrating signals received by the receiver, and acquiring a quality information correction coefficient according to the calibrating signals; and setting the mute threshold of the receiver according to background noise correction coefficient and the quality information correction coefficient. According to the invention, the correction coefficients are acquired through correcting the receiver, thereby ensuring setting for the mute thresholds of different receivers to be accurate, and enabling mute control not to be affected by individual differences of hardware. The method and the system provided by the invention are simple, high in accuracy, easy to implement and capable of being widely applied to the field of civil aviation.

1 citations

Journal Article
TL;DR: A minitype wireless noise measure system is designed to act as an automonitor, which has been proved to be a practical device in the noise simulation results of aircraft noise close to ground.
Abstract: Based on the demand for noise control and protection,a study on the noise diffuse and intensity of military aircraft is carried out.A boundary element model is established,making use of the ANSYS.In the noise simulation SYSNOISE is applied to get estimable simulation results of aircraft noise close to ground.A minitype wireless noise measure system is designed to act as an automonitor,which has been proved to be a practical device.

1 citations


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Performance
Metrics
No. of papers in the topic in previous years
YearPapers
202312
202231
2021364
2020403
2019485
2018426