UNE-EN IEC 60268-21:2018

This International Standard specifies acoustical measurement method that applies to electroacoustical transducers and passive and active sound systems such as loudspeakers, TV-sets,multi-media devices, personal portable audio devices, automotive sound systems andprofessional equipment.The device under test (DUT) may be comprised of electricalcomponents performing analogue and digital signal processing prior to the passive actuatorsperforming a transduction of the electrical input into an acoustical output 353 signal. The standarddescribes only physical measurements which assess the transfer behavior of the DUTbetween an arbitrary analogue or digital input signal and the acoustical output at any point inthe near and far field of the system. This includes operating the DUT in both the small andlarge signal domains. The influence of the acoustical boundary conditions of the targetapplication (e.g. car interior) can also be considered in the physical evaluation of the soundsystem. The standard does not assess the perception and cognitive evaluation of thereproduced sound and the impact of perceived sound quality.NOTE Some measurement methods defined in this standard may be applied to headphones, headsets, earphonesand earsets in accordance with IEC 60268-7. This standard does not apply to microphones and other sensors. Thisstandard does not require access to the state variables (voltage, current) at the electrical terminals of thetransducer. Sensitivity, electric input power and other characteristics based on the electrical impedance will bedescribed in a separate standard document IEC 60268-Xb dedicated to electrical and mechanical measurements.