Sound Localization and Hearing Protection Devices

Introduction The hearing protection device (HPD) can not lower the noise level in the workplace environment and is often used as a protection measure in the workplace environment when this level poses a threat to workers' hearing. HPD is a personally worn safety device that protects your hearing from the harmful effects of 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.

There are many kinds of hearing protective equipment available. Hearing protection devices are external or internal. External protection is an earmuff / earphone type. The inner ear type is suitable for the ear canal. Both types reduce opportunities to reach the eardrum and reduce hearing loss. The secret of fire safety is to understand the causes of fire, how to prevent it, and how to extinguish fire. This knowledge has to penetrate all engineers through a sound safety plan and occasional practice. Airports and other local fire stations are usually required to assist the trainer and help plan fire hazards in hangars, stores and routes.

Hangar This is a safety measure to prevent accidents and stop pedestrian traffic.

Humans can listen to a wide range of sound frequencies of about 20 to 20,000 Hz. The ability to judge or estimate a sound source (called sound image localization) depends on the hearing of each ear and the precise sound quality. As each ear is on the other side of the head, the sound first reaches the nearest ear, and the amplitude of the sound increases in the ear (and therefore increases). The majority of the brain's ability to find sounds depends on the difference in sound intensity and time between these ears (in the ear). A thick neuron can solve a time difference of about 10 milliseconds or a time difference between a sound reaching one ear and a sound reaching the other ear.

The ability of monaural auditory and sound image localization to sense and sense the location of the sound source has long been recognized as a need to use two ears (Kistler, 1997; Butler & Humanski, 1992; Carlile, 1990). This process is called binaural hearing. - Voices are different from the reality of sound, which is perceived reality, suggesting that it may be commonplace. For example, in the case of live performance, regardless of the viewer, the environment is full of sounds unrelated to music.

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.