What is BS EN IEC 60268‑21 – Acoustical measurements of sound system equipment about?
BS EN IEC 60268‑21 is the 21st part of the BS EN IEC 60268 multi-series that focuses on sound system equipment. BS EN IEC 60268‑21 specifies an 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 and professional equipment. The device under test (DUT) can be comprised of electrical components performing analogue and digital signal processing prior to the passive actuators performing a transduction of the electrical input into an acoustical output signal.
BS EN IEC 60268‑21 describes only physical measurements that assess the transfer behaviour of the DUT between an arbitrary analogue or digital input signal and the acoustical output at any point in the near and far field of the system. BS EN IEC 60268‑21 includes operating the DUT in both the small and large signal domains. The influence of the acoustical boundary conditions of the target application (e.g., car interior) can also be considered in the physical evaluation of the sound system.
Note: BS EN IEC 60268‑21 does not assess the perception and cognitive evaluation of the reproduced sound and the impact of perceived sound quality.
Who is BS EN IEC 60268‑21 – Acoustical measurements of sound system equipment for?
BS EN IEC 60268‑21 on acoustical measurements of sound system equipment is useful for:
- Audio system manufacturers
- Communication device manufacturers
- Acoustic foam and pads manufacturers
- Audio technicians
- Audio equipment companies
Why should you use BS EN IEC 60268‑21– Acoustical measurements of sound system equipment?
Loudspeakers, headphones, and other actuators have become more versatile and, as a result, new measurement techniques are required to evaluate these systems. BS EN IEC 60268‑21 provides a method that filters the measured sound pressure signal with the room correction function, which compensates for any phase and amplitude distortion before the signal is analyzed. This is a requirement for accurate measurement of nonlinear distortion and to apply windowing of the impulse response to the device under test.
BS EN IEC 60268‑21 discusses type description, physical characteristics, marking of terminals and controls, dimensions, mass, connectors and cable assemblies, steady-state single-tone signal, steady-state two-tone signal, sparse multi-tone, broadband noise signal, narrow-band noise, hann-burst signal, impulsive signal, half-space, free-field conditions, simulated free-field conditions, and half-space simulated free-field conditions.
