IS 9901 : Part 9 : 1986 Measurement of sound insulation in buildings and of building elements: Part 9 Laboratory measurement of room to room airborne sound insulation of a suspended ceiling with a plenum above it

1 Scope

1.1 This standard (Part 9) specifies a laboratory method ofmeasuring airborne sound insulation of a suspended ceiling with aplenum of defined height mounted above an acoustical barrier whichseparates two rooms in a standardized laboratory.

2 References

IS 2 :1960Rules for rounding off numerical values

IS 1885 : Part 3 : Sec 8 :1974 Electrotechnical vocabulary: Part 3Acoustics, Section 8 Architecturalacoustics

IS 6964 :1973Octave, half-octave and third-octaveband filters for analysis of sound andvibrations

IS 8225 :1976Method of measurement of absorptioncoefficients in a reverberation room

IS 9901 : Part 2 :1981Measurement of sound insulation inbuildings and of building elements: Part2 Statement of precision requirements