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Signal Recognition and Hearing Protectors With Normal and Impaired Hearing

Lazarus H.

International Journal of Occupational Safety and Ergonomics

2005

Vol. 11, No. 3

233--250

Recognition of acoustic signals when perception is subject to interference from noise has already been extensively studied. In this study the influence of hearing protectors (HP) (plugs, muffs) and hearing loss on signal recognition is examined. Different spectrums and levels of the noise are also included. The test results are shown as the masked threshold for the signals heard and identified. In the case of normally hearing subjects a frequency-independent HP (plug) improves hearing performance, while frequency-dependent HP (muffs) tends to worsen it, especially with low-frequency noise. Hearing losses even worsen hearing performance when plugs are worn. Design suggestions are made to optimise signal recognition. Minimum signal-to-noise ratio and the use of HP are discussed.

Noise Emission-A Part of Risk Assessment With a View to Machine Safety

Lazarus H., Kurtz P.

International Journal of Occupational Safety and Ergonomics

2003

Vol. 9, No. 3

351--364

For specific machinery groups standards on International Organization for Standardization (ISO) or European Committee for Standardization (CEN) levels describe safety aspects, technical data, or test methods. Problems with the implementation of noise aspects in safety standards are discussed. The reduction of emissions from machinery (noise, vibration, radiation, hazardous substances) has to date clearly been almost neglected, due, it seems, to the unsuitable approach of classical risk reduction. The concepts of the ISO/IEC Guide 51:1999 (ISO, 1999), Standards No. EN 292 (CEN, 2000c, d), and the Directive of the European Parliament and the Council 98/37/EC (the so-called Machinery Directive) to reduce risks are compared and specific requirements to safety standards according to emission, especially of noise, are presented.