Sound Localization and Hearing Protection Devices

Introduction Hearing protection devices (HPD) are best defined as "personal safety products to mitigate harmful hearing and / or annoying effects by sound" (Berger, 2003). It is well known that high levels of noise are generated in various work environments such as factories and military operations. Individuals employed in these professions may need to wear HPD to reduce the risk of hearing loss due to noise. However, under certain circumstances in these work environments, you need to let the listener hear a low level of sound for security reasons.

Hearing aid - a device that amplifies sound. Many people do not distinguish between the desired sound (message) and unnecessary sound (background noise or contention message). Hearing aid also does not overcome the distortion problem that occurs in most hearing impairments; that is, hearing aid users may be able to detect the presence of sounds but still do not know what the sound is . Audio Transmission (VCO) - Another form of electronic communication between the deaf, hearing impaired, or hearing person and relay service. Using the VCO, the caller talks directly to the handset, others listen to the voice of the caller, the relay service enters the content, and the caller reads the response on the VCO display.

Hearing loss is a decline in ability to hear sound. The hearing impaired could not hear the sound at all. Hearing impairment and hearing loss have many causes and may occur regardless of age. People suddenly lose their hearing as a complication of the virus, or they can lose their hearing due to illness, nerve injury or damage caused by noise. Approximately one-third of babies are born with hearing loss, often due to genetic factors. About 10 people in Canada have a mild hearing loss at a rate of about 2 people, and nearly half of Canadians over the age of 60 are deaf.

Hearing loss is on the one hand a slight hearing loss, on the other hand it is a complete and complete non-hearing loss. Conductive hearing loss prevents sound waves from reaching the inner ear. Sensory hearing loss is caused by nerve damage to the inner ear or the brain. Sensory hearing loss is likely to be permanent, causing hearing impairment. Conductive and sensory hearing loss may be mixed. Various situations cause partial and complete hearing loss. Ear infections, areas behind the tympanic membrane, eardrum holes, middle ear bone problems all cause hearing loss and hearing loss. In rare cases, the tumor may cause conductive hearing loss - they prevent sound intrusion into the inner ear. Diseases of birth defects and gene delivery can also do this. Genetics is the cause of sensory hearing loss. Half of all children with severe hearing loss have a genetic origin