Mosquito Sound App Download [PATCHED]
Avice Michonski
The Mosquito or Mosquito alarm is a machine used to deter loitering by emitting sound at high frequency. In some versions, it is intentionally tuned to be heard primarily by younger people. Nicknamed "Mosquito" for the buzzing sound it plays, the device is marketed as a safety and security tool for preventing youths from congregating in specific areas.
The latest version of the device, launched late in 2008, has two frequency settings, one of approximately 17.4 kHz[2] that can generally be heard only by young people, and another at 8 kHz that can be heard by most people. The maximum potential output sound pressure level is stated by the manufacturer to be 108 decibels (dB)(comparable in loudness to a live rock concert) and the manufacturer's product specification furthermore states that the sound can typically be heard by people below 25 years of age.[1] The ability to hear high frequencies deteriorates in most humans with age (a condition known as presbycusis), typically observable by the age of 18.[3]
The Mosquito was released to the mainstream market in 2005, through Stapleton's company Compound Security Solutions.[8] The current device has two settings: the high frequency sound targeted at youth, and another that can be heard by everyone. The range of the sound is 140 feet (43 m) with the sound baffle, and 200 feet (61 m) without. It requires a 24-volt DC or 15-volt AC power supply.
The sound was made into a mobile phone ringtone, which could not be heard by teachers if the phone rang during a class.[13] Mobile phone speakers are capable of producing frequencies above 20 kHz.[14] This ringtone became informally known as "Teen Buzz"[15] or "the Mosquito ringtone" and has since been sold commercially.
The results of the examination are now available. The auditors were not able to certify this device as completely safe.The risk to the target group of teenagers and young adults is relatively low. They can leave the area when they hear the sound. On the other hand small children and infants are especially at risk, due to lengthy exposure to the sound, because the adults themselves do not perceive the noise. Moreover, the ultrasound affects not only hearing. Disruption of the equilibrium senses, as well as other extra-aural effects are well known. With the sound levels that can be reached by the device, the onset of dizziness, headache, nausea and impairment is to be expected. This is not the limit of the total risks to safety and health.[17]
In a United Kingdom survey of the relevant studies of adults exposed to high frequency sound in an occupational context for the Health and Safety Executive (HSE) in 2001, it was concluded that the studies were inadequate to establish guidelines for safe exposure.[18] The Mosquito's manufacturer relies on these inconclusive adult studies to justify the safety of the device.[19]
The National Autistic Society said in 2008 that it was "extremely concerned" about possible harmful effects of the devices upon people with autism.[20] Since autism can cause auditory hypersensitivity, individuals with this disability can have more intense reactions to this sound, especially if they are also under 25. Since autism can also affect communication skills, some individuals may not be able to communicate their discomfort to caregivers. A supermarket in Longridge, England, removed a mosquito device in 2008 after a campaign by a 19-year-old Paul Brookfield, who has autism. Brookfield stated that the device was causing him pain due to his hypersensitivity.[20]
Background: To detect and identify mosquitoes using their characteristic high-pitched sound, we have developed a smartphone application, known as the 'HumBug sensor', that records the acoustic signature of this sound, along with the time and location. This data is then sent remotely to a server where algorithms identify the species according to their distinctive acoustic signature. Whilst this system works well, a key question that remains is what mechanisms will lead to effective uptake and use of this mosquito survey tool? We addressed this question by working with local communities in rural Tanzania and providing three alternative incentives: money only, short message service (SMS) reminders and money, and SMS reminders only. We also had a control group with no incentive.
Results: Qualitative data analysis revealed that for many participants (37 out of 81), the main motivation expressed was to learn more about the types of mosquitoes present in their houses. Results from the quantitative empirical study indicate that the participants in the 'control' group switched on their HumBug sensors more over the 14-week period (8 out of 14 weeks) when compared to those belonging to the 'SMS reminders and monetary incentives' trial group. These findings are statistically significant (p < 0.05 or p > 0.95 under a two-sided z-test), revealing that the provision of monetary incentives and sending SMS reminders did not appear to encourage greater number of audio uploads when compared to the control.
Conclusions: Knowledge on the presence of harmful mosquitoes was the strongest motive for local communities to collect and upload mosquito sound data via the HumBug sensor in rural Tanzania. This finding suggests that most efforts should be made to improve flow of real-time information back to the communities on types and risks associated with mosquitoes present in their houses.
It has long been known that male mosquitoes are attracted to real and artificial female flight tones (Maxim, 1901; Ross, 1901; Roth, 1948; Wishart and Riordan, 1959). Tones are detected by the antennae of the male, which are more plumose than those of the female, have a larger Johnston's organ, and are more sensitive to vibration (Göpfert et al., 1999). More recently, it has been shown that female mosquitoes hear and respond to male flight tones. In several species that have been investigated so far, courting males and females modulate their flight tones to converge toward a common frequency. Males and females of Toxorhynchites brevipalpis have similar flight tones and converge on the same wingbeat frequency during courtship, while same-sex pairs modulate wingbeat frequencies to avoid overlap (Gibson and Russell, 2006). In Culex quinquefasciatus, Culex pipiens, Anopheles gambiae, and Aedes aegypti, the frequencies of male and female flight are so far apart that convergence on the same fundamental frequency may not be compatible with flight. Instead, these species converge on a shared harmonic, the male first and female second or the male second and female third (Cator et al., 2009; Warren et al., 2009; Cator et al., 2010; Pennetier et al., 2010). Following successful courtship, the pair remains together in flight during copulation.
We thank Sylvie Pitcher, Melissa Orteza, and others in the lab of Professor Laura Harrington (Department of Entomology, Cornell University) for mosquito rearing and maintenance, and Yngve Birkelund (Department of Physics and Technology, University of Tromsø) for commenting on a draft of the manuscript. This research was supported by National Institutes of Health Award No. 5R01DC103-38 to R.R.H.
after my car has been running 30 min. or better. there is a sound that comes from the area of the speedometer. the sound is like a very large mosquito buzzing in your ear. it is sporadic most of the time, but if i drive the car for extended periods of time, (over an hour) it can be constant.
I may be way off base here, but I experienced the same problem in a rented Ford Taurus. When we got out on the highway, we had a terrible buzzing sound and it made travel very unpleasant. Around town, there was no buzzing. I returned the car to the rental agency and they knew exactly what the problem was. The windshield had recently been replaced and had not been properly sealed. I was upgraded at no charge to a Jeep Grand Cheroke.
Electrophysiology measurements show that mosquito auditory organs are the most sensitive among arthropods when exposed to the sound of an opposite-sex individual [13], with females generally slightly less sensitive than males ([1,16]; but see [22]). Behaviour studies demonstrate that, although females have not been shown to move towards the sound source of an individual male (phonotaxis), females of at least one mosquito species uses phonotaxis to locate a blood feeding host [23] and females of several mosquito species alter their wingbeat frequency when exposed to male sound [1,3,24] probably to hear the male better [3,6]. An important lacuna in the literature remains: can a single female hear the sound of an entire swarm of conspecific males?
Steps to evaluate the distance a female mosquito can detect the sound of an An. coluzzii male swarm of a given number of individuals. This schematic explanation shows how methodologies from behavioural assays (measurements) and acoustic theory (predictions) were employed in this study, based on details for An. coluzzii sound stimuli. The same procedure was repeated with sound stimuli of An. gambiae s.s. and the reciprocal experiment was performed with males exposed to sound stimuli of a female swarm for both species. (a) First, the reference stimulus (sound of 70 males swarming) was recorded at 0.9 m from the male swarm, producing an SPL of 20 dB. (b) Second, this stimulus was played back to one to five swarming (station-keeping) females in free-flight at four different sound levels (20, 25, 36 and 48 dB SPL) as measured at the mean females' distance to the speaker (figure 2a). None of them triggered a response in females. (c) Third, assuming the swarm sound emitted from the speaker to be a point source, and given the natural sound level of a 70-male swarm (LM) at a distance of 0.9 m (rref), we can compute the distance to a similar swarm corresponding to the other three sound levels (electronic supplementary material, Supplementary Methods) and compare it to the swarm radius. (d) Fourth, the effect of multiplying the number of swarming males per N over the loudest stimulus is predicted (electronic supplementary material, Supplementary Methods).
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