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Use of Telephones in Noisy Areas

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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

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Related Topics

• Acoustics

Room acoustics and acoustic properties. decibel A, B and C calculations. Noise Rating (NR) curves. Sound transmission through walls. Calculate sound pressure, sound intensity and sound attenuation.

Related Documents

Decibel

Logarithmic unit used to describe ratios of signal levels - like power or intensity - to a reference level.

Noise Criterion vs. Noise Rating and dB(A)

Comparing Noise Criterion (NC, NCB, RNC) to Noise Rating (NR) and dB(A).

SIL - the Speech Interference Levels

Background noise frequencies that interferes with speech.

Sound Power

Sound power from sources like fans, jet engines, cars, humans and more.

Sound Pressure

Sound Pressure is the force of sound on a surface perpendicular to the propagation of sound.

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