Audible signals warn, protect and guide us in the modern industrial world. They function where caution, prudence and clarity are imperative, indicate emergencies and demand direct action. They are globally understood, irrespective of language, written or spoken. Audible signals are deployed where an optical signal is insufficient or inappropriate. The basic signal is provided by one or more tones or a sequence of tones, raising awareness and alerting to a specific danger.
Decibel: unit of volumeders
The volume of a signal product is specified in decibels. In order to be able to correctly classify volume specifications in decibels, you need to know that doubling the dB value does not mean doubling the sound pressure level. A chainsaw with a volume of 120 dB generates a much higher sound pressure level than an average loud conversation at 60 dB. A doubling already occurs with an increase from 50 to 60 decibels. The pain threshold for human hearing is reached at a volume of 120 dB. Here are some examples from everyday life.
