Ergonomic assessment of speech communication -- Part 1: Speech interference level and communication distances for persons with normal hearing capacity in direct communication (SIL method)
This standard has been revised by ISO 9921:2003
Provides a method for prediction of the effectiveness of speech communication in the presence of noise generated by machinery as well as in noisy environment. Parameters are the ambient noise at the speaker's position, ambient noise at the listener's position, distance between the communication partners and a great number of physical and personal conditions.
A standard is reviewed every 5 years
Revisions / Corrigenda