Sound insulation measurement of building components:Sound insulation measurement mainly measures the sound pressure level difference at different center frequencies on both sides of the sound chamber and the sound chamber. According to different transmission routes, it can be divided into:Measurement of airborne sound insulation of building components; Measurement of sound insulation caused by floor impact.

Related standards:

1) GB/T50121-2005 Standard for Evaluation of Building Sound Insulation

2) GB/T19889 Acoustics - Measurement of Sound Insulation in Buildings and Building Components (Part 1-10)

Part 1: Requirements for laboratory testing facilities with suppressed lateral sound transmission;

Part 2: Determination, validation, and application of data precision;

Part 3: Laboratory measurement of airborne sound insulation of building components;

Part 4: On site measurement of airborne sound insulation between rooms;

Part 5: On site measurement of exterior wall components and exterior wall air sound insulation;

Part 6: Laboratory measurement of floor impact sound insulation;

Part 7: On site measurement of floor impact sound insulation;

Part 8: Laboratory measurement of improvement in impact sound of heavy standard floor cladding layer;

Part 9: Laboratory measurement of airborne sound insulation between two rooms connected above the suspended ceiling

Part 10: Laboratory measurement of airborne sound insulation of small building components

Reverberation chamber sound absorption measurement: a method of measuring the sound absorption coefficient of acoustic materials used to treat interfaces such as walls or ceilings, or the sound absorption of objects such as furniture, people, and spatial absorbers, in a reverberation chamber. Calculate the sound absorption coefficient of the sound-absorbing material based on the difference in reverberation time before and after placing the sound-absorbing material in the reverberation chamber. The sound absorption coefficient here refers to the ratio of the sound absorption of the specimen to the area of the specimen. Used to measure the sound absorption coefficient when sound is randomly incident, that is, the proportion of energy loss when sound is incident on materials from all directions.

Related standards: GB/T 20247-2006 Acoustics - Measurement of sound absorption in reverberation chambers

Indoor reverberation time measurement:The time required for the average sound energy density to decay by 60 dB from its original value after the sound reaches steady state and stops producing sound is called reverberation time, denoted as T60The unit is seconds (s). There are two methods for measuring reverberation time: the interrupted sound source method and the impulse response integration method.The interrupted sound source method is a method of recording the indoor sound pressure level attenuation curve by suddenly cutting off the sound source and stopping the sound after the sound source reaches a steady state.

Related standards:

1) GBJ 76-84 Specification for Measuring Reverberation Time in Halls

2) ISO 3382-2:2008 Acoustics - Measurement of acoustic parameters in rooms - General measurement of room reverberation time