Topic
Noise
About: Noise is a research topic. Over the lifetime, 5111 publications have been published within this topic receiving 69407 citations. The topic is also known as: Мопсы танцуют под радио бандитов из сталкера 10 часов.
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TL;DR: In this paper, the acoustic characteristics of various kinds of water sounds were investigated to evaluate their suitability for improving the soundscape with road traffic in urban spaces, and subjective evaluations were performed to find the proper level difference between water sounds and road traffic noise for making urban soundscape more subjectively pleasant.
Abstract: The acoustic characteristics of various kinds of water sounds were investigated to evaluate their suitability for improving the soundscape with road traffic in urban spaces. Audio recordings were made in urban spaces with water features such as fountains, streams, water sculptures, or waterfalls. The temporal and spectral aspects of the sounds were clarified, and subjective evaluations were performed to find the proper level difference between water sounds and road traffic noise for making urban soundscape more subjectively pleasant. The results indicated that the perceptual difference of the water sound level was around 3 dB with noises from road traffic in the background. The water sound, which had 3 dB less sound pressure level, was evaluated as preferable when the levels of road traffic noise were 55 or 75 dBA. It was also found that water sounds with relatively greater energy in low-frequency ranges were effective for masking noise caused by road traffic. The results of the present study will be valuable to urban designers and planners by providing guidelines for improving design solutions for water features in urban soundscape
61 citations
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TL;DR: In this paper, the critical ratio (K) is defined as the ratio of signal power to spectrum level at the masked threshold, and the function relating K to frequency was determined for cat in experiment II; tiffs function parallels that for man, but lies 4 to 5 dB above it at most frequencies.
Abstract: Masked thresholds were obtained by the method of behavioral audiometry fur each of four cats at eleven frequencies over the range from 125 to 16 000 cps. Bands of noise, which were approximately one to two octaves wide, as well as two broad bands of noise, were used as masking stimuli. Experiment I shows that the function relating masking to noise level has exactly the same form for cat as for man; the signal to‐noise ratios, however, are greater for cat than for man. The critical ratio (K) is defined as the ratio of signal power to spectrum level at the masked threshold. The function relating K to frequency was determined for cat in experiment II; tiffs function parallels that for man, but lies 4 to 5 dB above it at most frequencies. The masking data for the cat are shown to be consistent with measurements of frequency discrimination for this animal.
61 citations
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03 Apr 2001TL;DR: In this paper, a selective noise canceling device is disclosed that evaluates an external audio signal and determines whether a given external signal should be suppressed or reproduced, depending on the user's preference.
Abstract: A selective noise canceling device is disclosed that evaluates an external audio signal and determines whether a given external audio signal should be suppressed or reproduced A selective noise suppression circuit processes the external audio signal to classify the external audio signal as noise to be suppressed or as a desired audio signal to be reproduced An external audio signal, or a desired portion thereof, is reproduced if a portion of the external audio signal is likely to be of interest to the user The desired external signal may optionally be amplified over the primary selected audio signal for emphasis and the selected audio signal may optionally be suppressed entirely when the desired external signal is reproduced
61 citations
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TL;DR: The Lombard sign was investigated as a function of age and task, with children increased intensity equally in both tasks and adults increased intensity more during the story-telling task than during the labelling task.
Abstract: The Lombard sign was investigated as a function of age and task. Twenty adults and 20 5-year-old children spoke in quiet and in the presence of a 90-dB SPL noise. Half the subjects labelled a serie...
61 citations
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TL;DR: In this paper, the authors measured masked hearing thresholds of a beluga whale at the Vancouver Aquarium and found that the masked signal was a typical beluga vocalization; the masking noise included two types of icebreaker noise and naturally occurring icecracking noise.
Abstract: An experiment is presented that measured masked hearing thresholds of a beluga whale at the Vancouver Aquarium. The masked signal was a typical beluga vocalization; the masking noise included two types of icebreaker noise and naturally occurring icecracking noise. Thresholds were measured behaviorally in a go/no-go paradigm. Results were that bubbler system noise exhibited the strongest masking effect with a critical noise-to-signal ratio of 15.4 dB. Propeller cavitation noise completely masked the vocalization for noise-to-signal ratios greater than 18.0 dB. Natural icecracking noise showed the least interference with a threshold at 29.0 dB. A psychophysical analysis indicated that the whale did not have a consistent decision bias.
61 citations