National Standard TCVN 10615-1:2014 (ISO 3382-1:2009) on Acoustics - Measurement of room acoustic parameters - Part 1: Performance spaces

The reverberation time of a room is considered a primary indicator of acoustic characteristics. While continuous reverberation time is regarded as an important parameter, there is a reasonable consensus that other measurements, such as measuring relative sound pressure levels, early-to-late energy ratios, lateral fraction energy parameters, binaural cross-correlation functions, and background noise level, are necessary for a more thorough evaluation of room acoustic quality.

This standard establishes the method for obtaining reverberation times from impulse responses and interrupted noise. The annexes in this standard introduce concepts and details of measurement procedures for some newer methods, although this is not part of the main technical requirements of this standard. The purpose of this standard is to enable the comparison of reverberation time measurements with higher measurement uncertainty and to promote the use and consistency of new measurements.

Annex A introduces measurements based on squared impulse responses: reverberation time measurements (early decay time) and measurements of relative sound pressure levels, early-to-late energy fractions, lateral energy fractions in auditoria. In these types of measurements, it is still necessary to determine which measurements are most suitable for standardization; however, since they can all be determined from impulse responses, it is appropriate to use the impulse response as the basis for standard measurements. Annex B introduces binaural and head-related measurements and uses torso simulators (dummy heads) as required to perform binaural measurements in auditoria. Annex C introduces supportive methods considered useful for evaluating acoustic conditions from the perspective of musicians.