The RT60 reverberation test measures the time required for a sound to decrease in intensity from it’s original maximum level by 60 decibels. RT60 is measured in seconds and often stated as a single value. The actual measurements span the frequency band from 50 Hz to 8000 Hz with 1/1 or 1/3rd octave resolution. Rooms have individual absorption capabilities for each frequency, so the RT60 values within each band will vary.

ASTM E90: Standard Test Method for Laboratory Measurement of Airborne Sound Transmission Loss of Building Partitions and Elements (tested in laboratories).

ISO 10140-2: Laboratory measurement of sound insulation of building elements
Part 2: Measurement of airborne sound insulation

ASTM E336: Standard Test Method for Measurement of Airborne Sound Attenuation between Rooms in Buildings (tested on field).
ASTM E413-16 Classification for Rating Sound Insulation

ISO 16283-1: Field measurement of sound insulation in buildings and of building elements — Part 1: Airborne sound insulation
ISO 717-1: Rating of sound insulation in buildings and of building elements — Part 1: Airborne sound insulation

Established in U.S. for rating indoor noise, noise from air-conditioning equipment, etc. In Europe, it is common to use the Noise Rating Curve – NR.

This industry standard (also an ANSI standard) usually pertains to HVAC or mechanical noise impact. Occupant comfort is the goal of all HVAC designers. Sound (or noise) is a key parameter in measuring comfort.

ASTM E1686
Standard Guide for Applying Environmental Noise Measurement Methods and Criteria

ISO 1996-1: Description, measurement and assessment of environmental noise — Part 1: Basic quantities and assessment procedures
ISO 1996-2: Description, measurement and assessment of environmental noise — Part 2: Determination of sound pressure levels

ASTM E 1374-02: Standard Guide for Open Office Acoustics.

Speech Transmission Index (STI) is a measure of speech transmission quality. The STI measures some physical characteristics of a transmission channel (a room, electro-acoustic equipment, telephone line, etc.), and expresses the ability of the channel to carry across the characteristics of a speech signal. STI is a well-established objective measurement predictor of how the characteristics of the transmission channel affect speech intelligibility. The speech intelligibility is measured by playing a known signal (the STIPA test signal) through the PA and measuring the quality of that signal as it reaches each of the measurement positions.

IEC 60268-16: IEC 60268-16 specifies objective methods for rating the transmission quality of speech with respect to intelligibility. It provides a comprehensive manual for all types of users of the STI method in the fields of audio, communications and acoustics.

ASTM C423: Standard Test Method for Sound Absorption and Sound Absorption Coefficients by the Reverberation Room Method

ISO 354: Specifies a method of measuring the sound absorption coefficient of acoustical materials used as wall or ceiling treatments, or the equivalent sound absorption area of objects, such as furniture, persons or space absorbers, in a reverberation room.

E492: Standard Test Method for Laboratory Measurement of Impact Sound Transmission Through Floor-Ceiling Assemblies Using the Tapping Machine (tested in laboratories).

ISO 10140-3: Laboratory measurement of sound insulation of building elements — Part 3: Measurement of impact sound insulation (uses standard tapping machine)

AIIC / FIIC (Apparent IIC / Field IIC)
ASTM E1007: Standard Test Method for Field Measurement of Tapping Machine Impact Sound Transmission Through Floor-Ceiling Assemblies and Associated Support Structures (tested on field).

ISO 10052: Field measurements of airborne and impact sound insulation and of service equipment sound — Survey method
ISO 16283-2: Field measurement of sound insulation in buildings and of building elements — Part 2: Impact sound insulation (tapping machine and rubber ball)
(Note: Survey test methods for field measurements of airborne and impact sound insulation are dealt with in ISO 10052)