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21 Terminology 2.1.1A Sound Level ` A-weighted sound pressure level is the sound pressure level measured using an A-weighted network. 2.1.2 Equivalent [continuous A-weighted] sound pressure level Within a specified time、 if the A-weighted sound pressure of a continuous steady-state sound has the same mean square A-weighted sound pressure as the time-varying noise、 then the sound level of this continuous steady-state sound is the equivalent sound level of the time-varying noise. The unit is decibels、 dB. 2.1.3 Air borne sound refers to the sound source that propagates around the air. 2.1.4 Impact sound refers to the noise caused by the impact on a building structure. 2.1.5 Single number quantity: According to the method specified in the national standard "Evaluation Standard for Building Sound Insulation" GB/T 50121-2005、 the single sound insulation parameter is determined by comprehensively considering the sound insulation performance of the object of interest in the center frequency range of 100Hz~3150Hz at 1/3 octave (or 1/1 octave in the center frequency range of 125Hz~2000Hz). 2.1.6 Weighted sound reduction index · A single value evaluation quantity that characterizes the air sound insulation performance of building components. The weighted sound insulation should be measured in the laboratory. 2.1.7 Weighted standardized level difference The single value evaluation of the air sound insulation performance between two rooms obtained by taking the reverberation time of the receiving room as the correction parameter
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