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  • Reverberation Time RT60
    Reverberation Time RT60
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    PCM Telemetry
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Reverberation Time RT60

Reverberation time (RT60) is defined as the time it takes for the sound pressure level to fall for 60 dB, measured from the moment the generated test signal is ended.

IEPE
IEPE
Voltage
Voltage
Sound
Sound
Sound pressure
Sound pressure
Video
Video
High-speed video
High-speed video

Main Features

  • STANDARD ISO 354: measure reverberation time and absorption coefficient according to the ISO 354
  • INTEGRATED RESPONSE METHOD: the impulse response may be measured directly by using an impulse sound source
  • EVALUATION RANGES: different evaluation ranges for reverberation time estimation are possible (T20, T30 and T60)
  • ABSORPTION COEFFICIENT CALCULATION:  calculate absorption coefficient and make a report with provided Excel template
  • DIRECT MICROPHONE INPUT: the Dewesoft data acquisition hardware allows direct input of IEPE compatible microphones with TEDS support for automatic configuration. Data acquisition system can be configured for any number of microphone inputs.

Reverberation Time

Reverberation time is the time required for the sound pressure level to fall for 6’ 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. 

Evaluation Range

Reverberation time can be evaluated based on a smaller dynamic range than 6’ dB and extrapolated to a decay time of 6’ 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 1’ dB above the overall background noise of the measuring system.

  • T2’ - derived from the time at which the decay curve first reaches 5 dB and 25 dB below the initial level.
  • T3’ - derived from the time at which the decay curve first reaches 5 dB and 35 dB below the initial level.
  • T6’ - derived from the time at which the decay curve first reaches 5 dB and 65 dB below the initial level.

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.

Calculated Output Channels

  • 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


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).

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). 

Report and Analysis

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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