Narrow‐band acoustic signals emitted by chinchilla ears after noise exposure

1981 ◽  
Vol 70 (2) ◽  
pp. 446-450 ◽  
Author(s):  
P. M. Zurek ◽  
W. W. Clark
Keyword(s):  
Noise Exposure ◽  
Narrow Band ◽  
Acoustic Signals

Relationships between acoustic reflex patterns elicited by unfiltered white noise and narrow band white noise stimuli of different duration but of the same intensity

1985 ◽  
Vol 99 (9) ◽  
pp. 857-863 ◽  
Author(s):  
Giovanni Rossi ◽  
Paolo Solero ◽  
M. Rolando
Keyword(s):  
White Noise ◽  
Narrow Band ◽  
Acoustic Signals ◽  
The Other ◽  
Acoustic Reflex ◽  
Other Hand ◽  
Recruitment Time

AbstractFor the purpose of this study, acoustic signals were generated by an Amplaid MK VI. An Amplaid 702 impedence meter was connected to its averaging section and to its computer. The stimuli were bursts of unfiltered white noise (UWN) and of narrow band white noise (NBWN; 30 db./oct/slope; central frequencies 1,000, 2,000, 4,000 Hz.) lasting 3–1,000 msec, at intensity of 105 db. SPL p.e. The following parameters were evaluated: stapedius contraction latency, amplitude, duration and recruitment time. It was found that latency was independent of the spectrum of the stimulus and its duration. Amplitude and recruitment time, on the other hand, were related to spectrum and duration, while duration of contraction was directly related to the duration of the stimulus only.

Phase variance of narrow-band acoustic signals on near-surface paths

2017 ◽  
Vol 30 (3) ◽  
pp. 236-242 ◽  
Author(s):  
V. P. Mamyshev ◽  
S. L. Odintsov
Keyword(s):  
Narrow Band ◽  
Acoustic Signals ◽  
Near Surface ◽  
Phase Variance

Optimization of the spectral signal processing for narrow‐band stochastic acoustic signals

1996 ◽  
Vol 100 (4) ◽  
pp. 2832-2832
Author(s):  
Leonid M. Gelman ◽  
Yuri V. Burau ◽  
Vladimir I. Krytsyn
Keyword(s):  
Signal Processing ◽  
Narrow Band ◽  
Acoustic Signals ◽  
Spectral Signal

scholarly journals Bats adjust temporal features of echolocation calls but not those of communication calls in response to traffic noise

2018 ◽  
Author(s):  
Shengjing Song ◽  
Aiqing Lin ◽  
Tinglei Jiang ◽  
Xin Zhao ◽  
Walter Metzner ◽  
...  
Keyword(s):  
Noise Exposure ◽  
Traffic Noise ◽  
Acoustic Signals ◽  
Vocal Response ◽  
Auditory Masking ◽  
Temporal Features ◽  
Acoustic Masking ◽  
Communication Calls ◽  
Call Sequence ◽  
The Impact

Summary statementThis study reveals the impact of anthropogenic noise on spectrally distinct vocalizations and the limitations of the acoustic masking hypothesis to explain the vocal response of bats to chronic noise.AbstractThe acoustic masking hypothesis states that auditory masking may occur if the target sound and interfering sounds overlap spectrally, and it suggests that animals exposed to noise will modify their acoustic signals to increase signal detectability. However, it is unclear if animals will put more effort into changing their signals that spectrally overlap more with the interfering sounds than when the signals overlap less. We examined the dynamic changes in the temporal features of echolocation and communication vocalizations of the Asian particolored bat (Vespertilio sinensis) when exposed to traffic noise. We hypothesized that traffic noise has a greater impact on communication vocalizations than on echolocation vocalizations and predicted that communication vocalization change would be greater than echolocation. The bats started to adjust echolocation vocalizations on the fourth day of noise exposure, including an increased number of call sequences, decreased number of calls, and vocal rate within a call sequence. However, there was little change in the duration of the call sequence. In contrast, these communication vocalization features were not significantly adjusted under noise conditions. These findings suggest that the degree of spectral overlap between noise and animal acoustic signals does not predict the level of temporal vocal response to the noise.

scholarly journals Special acoustic devices of law enforcement agencies: a short history, medical and biological effects on the hearing organ

2021 ◽  
pp. 83-90
Author(s):  
M. S. Kuznetsov ◽  
S. M. Logatkin ◽  
V. V. Dvorjanchikov
Keyword(s):  
Law Enforcement ◽  
Noise Exposure ◽  
Biological Effects ◽  
Acoustic Signals ◽  
Biological Assessment ◽  
Law Enforcement Agencies ◽  
Russian Science ◽  
Russian Science Citation Index ◽  
Hearing Organ ◽  
The Impact

Relevance. The introduction of special acoustic devices into the security system necessitates a medical and biological assessment of the impact of acoustic signals.Intention – To analyze domestic and foreign literature on the history of acoustic weapons and their medical and biological effects, as well as to study current ideas about sound-induced damage to operators of this equipment and exposed persons.Methodology. In this paper, we analyzed domestic and foreign publications (monographs, articles) about creation and use of special acoustic devices as non-lethal acoustic weapons. Besides, regulatory documents on safe levels of noise exposure were analyzed. PubMed, Russian Science Citation Index, Сonsultant plus database were also searched.Results and Discussion. Non-lethal acoustic weapons were developed and their effects studied mainly by foreign researchers (USA, UK). Sources of special acoustic signals (sound generators, cannons, grenades) are mainly used to disperse crowds of people and control illegal actions against law-enforcement officers. Such weapons are widely used by foreign police and military personnel (USA, Georgia, Ukraine etc.). Only a few publications in Russian describe special acoustic effects on the hearing organ of animals and humans.Conclusion. Safety assessment of acoustic effects of special devices is very important and requires further study in relation to the national legislation.

Spontaneous narrow‐band oto‐acoustic signals emitted by human ears: A replication

1984 ◽  
Vol 76 (4) ◽  
pp. 1248-1250 ◽  
Author(s):  
Craig C. Wier ◽  
Susan J. Norton ◽  
Gail E. Kincaid
Keyword(s):  
Narrow Band ◽  
Acoustic Signals
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