GB 12525-1990 Emission standards and measurement methods of railway noise on the boundary alongside railway line

GB/T 3785-1983 Electric, sonic properties and measuring methods for sound level meters GB/T 3785.1-2010 Electroacoustics—Sound level meters—Part 1:Specifications GB/T 3785.1-2023 Electroacoustics—Sound level meters—Part 1:Specifications GB/T 3785.2-2010 Electroacoustics—Sound level meters—Part 2:Pattern evaluation tests GB/T 3785.2-2023 Electroacoustics—Sound level meters—Part 2:Pattern evaluation tests GB/T 3785.3-2018 Electroacoustics—Sound level meters—Part 3:Periodic tests GB/T 3222-1994 Acoustics—Measurement method of environmental noise GB/T 3222.1-2006 Acoustics—Description, measurement and assessment of environmental noise—Part 1:Basic quantities and assessment procedures GB/T 3222.1-2022 Acoustics—Description,measurement and assessment of environmental noise—Part 1:Basic quantities and assessment procedures GB/T 3222.2-2009 Acoustics—Description,measurement and assessment of environmental noise—Part 2:Determination of environmental noise levels GB/T 3222.2-2022 Acoustics—Description,measurement and assessment of environmental noise—Part 2:Determination of sound pressure levels GB/Z 3222.3-2026 Acoustics—Description, measurement and assessment of environmental noise—Part 3:Objective method for the measurement of prominence of impulsive sounds and for adjustment of L Aeq