scholarly journals A psychoacoustical study to investigate the perceived unpleasantness of infrasound combined with audio-frequency sound

Acta Acustica ◽  
2020 ◽  
Vol 4 (5) ◽  
pp. 20
Author(s):  
Elisa Burke ◽  
Stefan Uppenkamp ◽  
Christian Koch
Keyword(s):  
Auditory Perception ◽  
Detection Threshold ◽  
Pairwise Comparison ◽  
Audio Frequency ◽  
Frequency Range ◽  
Comparison Task ◽  
Simultaneous Exposure ◽  
Large Variability ◽  
Numerical Scale ◽  
The Common

At many immission sites of infrasound (frequency f < 20 Hz), humans are exposed to a mixture of infrasound and sound in the common audio-frequency range (audio sound, 20 Hz < f < 20 kHz). Therefore, the purpose of this study was to examine the auditory perception of infrasound and audio sound not only in isolation but also in combination. This laboratory study aims to investigate the perceived unpleasantness of infrasound (sinusoid at 12 Hz) and audio sound (sinusoid at 1000 Hz, pink-noise 250–4000 Hz), presented alone or in combination with each other. A pairwise comparison task and a rating task using a numerical scale were conducted with 19 normal hearing listeners. In addition, individual detection thresholds were determined for the infrasound stimulus. Combinations of infrasound and audio sound were rated as equally or more unpleasant than either sound presented alone. Inter-individual differences in unpleasantness ratings using the numerical scale were particularly high for stimuli containing infrasound. This can only in part be related to the large variability in infrasound thresholds. These findings suggest that simultaneous exposure to infrasound and audio sound can increase the perceived unpleasantness when both are presented at a sufficient level above the detection threshold.

scholarly journals Sound Source System for Investigating the Auditory Perception of Infrasound Accompanied by Audio Sound

2019 ◽  
Vol 105 (5) ◽  
pp. 869-874
Author(s):  
Elisa Burke ◽  
Johannes Hensel
Keyword(s):  
Sound Source ◽  
Auditory Perception ◽  
Basic Knowledge ◽  
Frequency Range ◽  
Special Design ◽  
Simultaneous Generation ◽  
Monaural Stimulation ◽  
The Common ◽  
High Level ◽  
Stimulation Of

To gather more basic knowledge about both infrasound-perception mechanisms and the annoyance caused by infrasound, it is important to investigate the influence of the interaction between infrasound and sound at frequencies inside the common audio frequency range (audio sound) on the auditory perception. This paper gives a detailed description of a newly developed sound source system allowing simultaneous monaural stimulation of listeners with infrasound and audio-sound stimuli in psychoacoustic experiments. The sound source system covers a frequency range between 4 Hz and 6000 Hz. It can generate infrasound stimuli and audio-sound stimuli up to at least 123 dB SPL and 80 dB SPL, respectively, with inaudible harmonic distortions. Likewise, during simultaneous generation of high-level infrasound and audio sound, residual unwanted modulation frequencies remain imperceptible, owing to special design features. It can be concluded that the sound source system is suitable for investigating the auditory perception of infrasound accompanied by audio sound.

scholarly journals Detection Thresholds for Combined Infrasound and Audio-Frequency Stimuli

2019 ◽  
Vol 105 (6) ◽  
pp. 1173-1182 ◽  
Author(s):  
Elisa Burke ◽  
Johannes Hensel ◽  
Thomas Fedtke ◽  
Stefan Uppenkamp ◽  
Christian Koch
Keyword(s):  
Detection Threshold ◽  
Stimulus Frequency ◽  
The Other ◽  
Pink Noise ◽  
Audio Frequency ◽  
Frequency Range ◽  
Sensation Level ◽  
Noise Stimulus ◽  
Detection Thresholds ◽  
Threshold Levels

This study investigated whether the presence of audio sound (20 Hz < frequency f < 20 kHz) influences the detection threshold for infrasound (f < 20 Hz), and, vice versa, whether the presence of infrasound influences the detection threshold for audio sound. Monaural detection thresholds of thirteen otologically normal listeners were repeatedly determined for infrasound stimuli (sinusoids at 5 Hz and at 12 Hz) and for audio sound stimuli (sinusoids and bandlimited pink noise), separately and in presence of the respective other sound type. The measurements were performed with an adaptive 1-up-2-down 3-alternative forced-choice (3-AFC) procedure. Threshold levels for infrasound stimuli were not affected by audio sound at +5 dB sensation level (SL), but they were significantly increased by the presence of some of the audio sound stimuli presented at +50 dB SL. For example, thresholds for the detection of infrasound increased on average by around 5 dB when simultaneously presented with a pink-noise stimulus (frequency range: 250 Hz– 4000 Hz). On the other hand, the presence of infrasound with levels up to +10 dB SL did not cause any significant change in the detection thresholds for audio sound. This could be an indication that infrasound might even be more annoying in a quiet environment.

scholarly journals Dielectric anomalies of solid CO and N2 in the audio frequency range

1999 ◽  
Vol 256 (1) ◽  
pp. 75-80 ◽  
Author(s):  
S. Pilla ◽  
J.A. Hamida ◽  
K.A. Muttalib ◽  
N.S. Sullivan
Keyword(s):  
Audio Frequency ◽  
Frequency Range ◽  
Audio Frequency Range

scholarly journals Solving Noise Pollution Issue Using Plenum Window with Perforated Thin Box

Crystals ◽  
2020 ◽  
Vol 10 (7) ◽  
pp. 614
Author(s):  
Hsiao Mun Lee ◽  
Andi Haris ◽  
Kian Meng Lim ◽  
Jinlong Xie ◽  
Heow Pueh Lee
Keyword(s):  
White Noise ◽  
Traffic Noise ◽  
Noise Pollution ◽  
Experimental Results ◽  
Frequency Range ◽  
Noise Mitigation ◽  
Noise Sources ◽  
Acoustic Performance ◽  
Common Noise ◽  
The Common

In the present study, a conventional plenum window was incorporated with perforated thin box in order to enhance its performance at frequency range which centralized at 1000 Hz as most of the common noise sources at city nowadays are centralizing around this frequency. The entire studies were conducted in a reverberation room. The effectiveness of jagged flap on mitigating diffracted sound was also studied. Three types of noises were examined in the current study—white noise, traffic noise and construction noises. The experimental results showed that the plenum window with perforated thin box could reduce 8.4 dBA, 8.7 dBA and 6.9 dBA of white, traffic and construction noises, respectively. The jagged flaps did not have significant effect on the plenum window’s noise mitigation performance. When frequencies were ranging from 800 Hz to 1250 Hz, when compared with the case of without perforated thin box, it was found that the perforated thin box had good acoustic performance where it was able to reduce additional 1.6 dBA, 1.6 dBA and 1.2 dBA of white, construction and traffic noises, respectively.

scholarly journals Cortical Processing of Frequency Changes Reflected by the Acoustic Change Complex in Adult Cochlear Implant Users

2018 ◽  
Vol 23 (3) ◽  
pp. 152-164 ◽  
Author(s):  
Chun Liang ◽  
Lisa M. Houston ◽  
Ravi N. Samy ◽  
Lamiaa Mohamed Ibrahim Abedelrehim ◽  
Fawen Zhang
Keyword(s):  
Speech Perception ◽  
Cochlear Implant ◽  
Change Detection ◽  
Detection Threshold ◽  
Auditory Evoked Potential ◽  
Frequency Change ◽  
Large Variability ◽  
Frequency Changes ◽  
Acoustic Change Complex ◽  
Electroencephalographic Recording

The purpose of this study was to examine neural substrates of frequency change detection in cochlear implant (CI) recipients using the acoustic change complex (ACC), a type of cortical auditory evoked potential elicited by acoustic changes in an ongoing stimulus. A psychoacoustic test and electroencephalographic recording were administered in 12 postlingually deafened adult CI users. The stimuli were pure tones containing different magnitudes of upward frequency changes. Results showed that the frequency change detection threshold (FCDT) was 3.79% in the CI users, with a large variability. The ACC N1’ latency was significantly correlated with the FCDT and the clinically collected speech perception score. The results suggested that the ACC evoked by frequency changes can serve as a useful objective tool in assessing frequency change detection capability and predicting speech perception performance in CI users.

Imperatives of visual versus auditory perception as pragmatic markers in English and Dutch

2010 ◽  
Vol 3 (1) ◽  
pp. 74-94 ◽  
Author(s):  
Daniël Van Olmen
Keyword(s):  
Frequency Distribution ◽  
Auditory Perception ◽  
The Other ◽  
Common View ◽  
Pragmatic Markers ◽  
The Common ◽  
The Difference ◽  
The One

This article examines the English and Dutch imperatives of intentional visual and auditory perception and in particular their use as pragmatic markers. Look, listen, kijk ‘look’ and luister ‘listen’ are compared with respect to frequency, distribution and usage. The difference between look and kijk, on the one hand, and listen and luister, on the other, is argued to be indicative of a more general cross-linguistic tendency. This tendency is explained in terms of the imperatives’ effectiveness in and likely recruitment for what has traditionally been called attention-getting and in terms of the common view of the nature of visual and auditory perception.

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