Telephone use in Noisy Areas

Use of telephone in noisy areas - satisfactory, difficult and impossible noise levels

Background noise interferes with telephone conversations, and

  • conditions are satisfactory at levels less than 65 SIL (dB) (approx. 72 dBA)
  • conditions are difficult at levels in the range 65 - 80  SIL (dB) (approx. 72 - 87 dBA)
  • conditions are impossible at levels above 80  SIL (dB) (approx. 87 dBA)

SIL - Speech Interference Levels

Related Topics

  • Acoustics - Room acoustics and acoustic properties - decibel A, B and C - Noise Rating (NR) curves, sound transmission, sound pressure, sound intensity and sound attenuation

Related Documents

  • Comparing Noise Criteria - Comparing Noise Criteria - Noise Criterion (NC, NCB, RNC), Noise Rating (NR) and dB(A)
  • SIL - Speech Interference Levels - Approximate speech interference levels
  • Decibel - Decibel is a logarithmic unit used to describe the ratio of a signal level - like power, sound pressure, voltage, intensity etc. to a reference level
  • Sound Pressure - Sound Pressure is the force of sound on a surface area perpendicular to the direction of sound
  • Sound Power - Sound Power Level from common sources like fans, jet engines, cars, humans and more ..

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