#1 22-04-2015 09:33:12

tinnitusmosquito
Member
Registered: 09-02-2014
Posts: 2

High frequency sound in you're garden?

I receive complaints about the Cat Deterrent.

The elderly in particular use a cat-deterrent in their garden. It is a small apparatus with a speaker attached to it. It produces a high-pitched bleep of more than a 100 decibel. The sound is mostly only audible for children, youngsters and people with ears that are still good. Many cat-deterrents use the same noise as the Mosquito. The sound causes pain in the ears, headache, and ringing in the ears. If you have any complaints consult your GP and make mention of it on social media! Working Mosquito: 17KHz-20KHz 90dB Working Cat Deterrent/Animal Chaser: 16KHz-23KHz 130dB



For the very high frequencies, 10-20 kHz, the limits were given as one-third-octave band Sound Pressure Levels in the range 75-85 dB, to avoid unpleasant subjective effects in exposed persons; higher noise levels were found to cause annoyance, tinnitus, headaches, fatigue and even nausea.

For ultrasonic components above 20 kHz, the limits were set to avoid hearing damage in the audible (lower) frequencies. One-third-octave band levels of 105-115 dB were observed to produce no temporary hearing loss, and were therefore judged non-hazardous in respect of permanent hearing damage.



http://www.hse.gov.uk/research/crr_pdf/ … r01343.pdf



For the degree of the sound source awareness, 43% of the subjects answered that they “know (the device).” However, when asked about the kind of sound, many of them mistook it for a “mosquito sound.” In addition, some responded that “my head may split” and “I will never come here again because of the pain in the ear.



http://www.icben.org/2014/papers/Team4/ … Ueda_1.pdf

Who can tell me more?

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#2 22-04-2015 12:36:16

nibold
Member
Registered: 26-12-2013
Posts: 172

Re: High frequency sound in you're garden?

if you are able to understand german as source language or translate it, this link may be useful:  www.knalltrauma.ch

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