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Reverberation Time RT60 Measurement

When room acoustics properties are at issue, the RT60 Reverberation Time solution represents an essential tool for obtaining accurate measurement results. The easy setup enables reliable measurement for effective modification of room parameters and easy achievement of desired reverberation time.
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Reverberation Time RT60

Reverberation time is the time required for the sound pressure level to fall for 60 dB from its initial level. Sound waves in a room will repeatedly bounce off reflective surfaces.

When these reflections mix with each other, a phenomena known as reverberation is created. Reverberation reduces when the reflections hit absorbent surfaces such as curtains, chairs and tables. Reverberation is a key parameter when qualifying the acoustic status of a room.
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Evaluation Range

Reverberation time can be evaluated based on a smaller dynamic range than 60 dB and extrapolated to a decay time of 60 dB. The evaluation of the decay curve for each frequency band shall start at 5 dB below the initial sound pressure level. The bottom of the evaluation range should be at least 10 dB above the overall background noise of the measuring system.

​T20 - derived from the time at which the decay curve first reaches 5 dB and 25 dB below the initial level.
​T30 - derived from the time at which the decay curve first reaches 5 dB and 35 dB below the initial level.
T60 - derived from the time at which the decay curve first reaches 5 dB and 65 dB below the initial level.
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Crosspoint Search

Use the improved algorithm for reverberation time estimation (Lundby algorithm) with an automatic search option.

Option manual will calculate the reverberation time from the first to the second locked cursor. It is important to place the first cursor on the right position, and the position of the second cursor will be found automatically.
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Calculated Output Channels

Reverberation time Math will calculate several parameters and output them as separated channels. The calculations are:

​T - measured reverberation time
ETC - energy time curve
Octave Time Data - octave analysis type can be selected from 1/1 or 1/3 octave
Line Fit - fitted curve on energy time curve
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Integrated Response Method

The impulse response may be measured directly by using an impulse source such as a pistol shot, balloon burst, spark gap or any other sound source that produces an impulse with sufficient bandwidth and energy.
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Absorption Coefficient Calculation

The absorption (alpha) coefficient of a material indicated the proportion of sound which is absorbed by the surface compared to the proportion which is reflected back into the room.

Provided Excel template contains formulas for averaging and calculation of absorption (alpha) coefficient. Enter the parameters about the room conditions and dimensions (temperature, humidity, volume, surface).
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Analysis and Report Generation

The section in Excel template is dedicated to reporting. Alpha coefficient is calculated from reverberation times and other parameters that have to be entered (surface area of a test specimen, speed of sound, ...).

​The result shown in the Excel template is the alpha coefficient for each frequency band and a graph of the alpha coefficient.
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  • Home
  • Products
    • Dewesoft Test & Measurement Equipment >
      • USB & Ethercat DAQ Systems
      • Rugged Data Acquisition Systems
      • Portable Data Acquisition Systems
      • Modular Data Acquisition Systems
      • Power Analyzer
      • Data Acquisition Software
      • Sensors
    • Neo Messtechnik Power Quality Analyzer
    • CAE Acoustic & Vibration
    • PCB Test & Measurement Sensors & Instrumentation >
      • Accelerometers
      • Acoustics
      • Force Sensors
      • Impact Hammers
      • Pressure Sensors
      • Strain Sensors
      • Signal Conditioners & Amplifiers
    • IMI Sensors for Condition Monitoring >
      • Industrial Accelerometers for Machinery Health Monitoring
      • 4 - 20mA Vibration Transmitters for Process Vibration Monitoring
      • Pressure Transducers
      • Vibration Switches
    • Endevco Sensors for Challenging Test & Measurement Applications >
      • Accelerometers
      • Accelerometer Simulator
      • Pressure Transducers
      • Signal Conditioners
    • Larson Davis for Noise Monitoring Solutions >
      • Sound Level Meters
      • Environmental Noise Monitoring
      • Workplace Noise & Vibration
    • Resensys Remote Monitoring Sensors
    • OMS Non-Contact Vibration Measurement
  • APPLICATIONS
    • DEWESOFT >
      • Acoustics >
        • Sound Level Meter
        • Octave Band Analysis
        • Sound Intensity
        • Sound Power
        • Reverberation Time RT60
      • Structural Dynamics >
        • FFT Analyzer
        • Fatigue Testing
        • Modal Testing
        • Shock Response Spectrum
        • Sine Reduction Test (COLA)
        • Bridge Monitoring
      • Monitoring >
        • Condition Monitoring
        • Condition Monitoring Software
      • Vibration Analysis >
        • FFT Analyzer
        • Human Body Vibration
        • Octave Analysis
        • Order Tracking Analysis
      • Vehicle Testing >
        • ADAS >
          • Collision Avoidance Testing
          • Blind Spot Detection Testing
          • Lane Departure Warning & Lane Assist System Testing
          • Adaptive Cruise Control Testing
          • Autonomous Vehicles Testing
        • Brake Testing >
          • Flexible Brake Testing System
          • Brake Testing Calculations
          • Automated Testing Workflow
          • Brake Test System Configuration Examples
          • Supported Automated Brake Testing Standards
          • Free Online Brake Test Training & Resources
        • Brake Noise Testing >
          • Brake Noise Detection
          • Brake Noise Input Channel Configuration
          • Brake Noise Analysis Results
        • Combustion Analysis >
          • In-car and Testbed Data Acquisition System
          • Internal Combustion Engine R & D
          • Simple & Intuitive Configuration
          • Heat Release Calculation
          • IC Engine Knocking Detection
          • Combustion Noise Measurement & Analysis
          • Additional Math Calculations & Statistics
          • Combustion Analysis Features
          • Raw Data Storage, Post Processing & Reporting Capabilities
          • Free Online Training Course
        • E-Mobility >
          • Electric Vehicle Testing
          • Hybrid Vehicle Testing
          • Hydrogen Vehicle Testing
          • Battery Testing
          • EV Charging Analysis
          • Testbed & On-road Testing
          • Synchronized Measurement of Several Vehicle Parameters
          • Exemplary E-Mobility
          • Analyzing Different Driving Situations
          • Charging Profile, Time & Efficiency
          • EMC Test
        • Harsh Environment Testing >
          • Vehicle Environmental Tests
          • Distributed Data Acquisition
          • Heating & Air Condition Testing
          • Climate Comfort Testing
        • Roadl Load Data / Durability >
          • Durability Testing Overview
          • Compact All-in-one DAQ System
          • Powerful DAQ Software
          • Digital Interface to 3rd Party Durability Test Benches
        • Vehicle Dynamics >
          • Vehicle Dynamics Test Suite
          • Vehicle Dynamics DAQ System Overview
          • Standard Vehicle Test Maneuvers
          • Data Processing
          • Vehicle Test Suite Applications
          • Easy Controls for Test Driver
      • Power & Energy >
        • Power Analyzer >
          • Motor & Inverter
          • Power Transformer
          • Standby Power
          • Electrical Equipment
        • Power Quality Analyzer >
          • Railway
          • Renewable Energy
          • Wind Power
    • CAE ACOUSTIC & VIBRATION >
      • First Handheld Sound Camera
      • Simplest Way to Image Sound Sources
      • Room / Building Acoustic
      • Compressed Air Leak Detection
      • SoundCam in Automotive Industry
      • Noise at Construction Site
      • Acoustic Applications
    • PCB PIEZOTRONICS >
      • Test & Measurement
      • Aerospace & Defense
      • Automotive
    • ENDEVCO SENSORS >
      • Endevco Sensors Typical Applications
    • IMI INDUSTRIAL SENSORS >
      • Energy
      • PDM & Process Monitoring
    • OMS LASERPOINT & SCANNER
  • VIBRATION TESTING & CALIBRATION SYSTEM
    • DEWESoft Vibration Shakers
    • PCB Portable Handheld Shaker
    • IMI Industrial Portable Handheld Shaker & Calibrator
    • ECON Vibration Testing System >
      • Miniature Shaker
      • Air Cooled Shaker
      • Water Cooled Shaker
      • Climate Chamber Combined Shaker
      • Hydraulic Shaker
      • Multi-Axis Shaker
      • Vibration Controller >
        • VT-6 Series Servo-vibration Controller
        • VT-8 Series MIMO Vibration Controller
        • VT-9 Series Vibration Controller
      • Power Amplifier >
        • VSA-L Series Linear PA
        • VSA-H Series Switching PA
      • Slip Table
      • Head Expander
    • Dewesoft & PCB Instrument Calibration Service >
      • DEWESoft
      • PCB Sensors & Instrumentation
  • INFORMATION
    • DOWNLOAD >
      • DEWESOFT >
        • Products Catalog
        • Applications Brochure
        • Products Brochure
      • CAE Acoustic & Vibration
      • PCB Piezotronics >
        • ENDEVCO Sensors
        • Accelerometers
        • Acoustic & Sound Measurement
        • Force, Load & Strain Sensors
        • Pressure Sensors
        • Torque Sensors
        • Electronics & Signal Conditioning
      • IMI Industrial Sensors >
        • ICP Accelerometers
        • Charge Accelerometers
        • 4-20mA Transmitters
        • Vibration Switches
        • IMI Pressure Sensors
        • Cables, Enclosures & Accessories
        • Electronics
      • Calibration Instruments
    • VIDEOS >
      • CAE Acoustic & Vibration
      • DEWESoft
      • PCB Piezotronics >
        • PCB Piezotronics Virtual Tour
    • TRAINING >
      • Getting Started with DEWESOFT
      • How to Measure Signals
      • How to Analyze Data
    • WEBINARS
  • Contact