GB/T 12060.21-2025 Sound system equipment—Part 21:Acoustical(output-based）measurements

Scope

This document describes the acoustic measurement methods applicable to passive sound systems and active sound systems (such as speaker units, televisions, multimedia devices, personal portable audio devices, automotive sound systems, and sound reinforcement equipment). The device under test (DUT) may consist of electronic components and passive drivers. The electrical input signal first undergoes analog and digital signal processing by the electronic components, and then is converted into an acoustic output signal by the passive drivers.
The physical measurements described in this document enable the evaluation of the transfer behavior between any analog or digital input signal of the DUT and the acoustic output at any point in the near and far field of the system. This includes measuring the DUT in both the small-signal and large-signal domains. When conducting physical evaluations of sound systems, the effects of acoustic boundary conditions of the target application (such as the interior of a car) may also be considered. This document does not evaluate the perception and cognitive assessment of reproduced sound or the impact on perceived sound quality.
Note: According to Reference [1], some of the measurement methods defined in this document can be applied to headphones, headphone-microphone sets, earphones, and earphone-microphone sets. This document is not applicable to microphones and other sensors. This document does not require obtaining state variables (voltage, current) of the transducer electrical terminals. Sensitivity, electrical input power, and other characteristics based on electrical impedance will be described in a separate standard document IEC 60268-22, which is specifically used for electrical and mechanical measurements.

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