Room Acoustics - Acoustical Parameters Measurement

Room Acoustics - Acoustical Parameters Measurement

Room Acoustics plugin can be used for computing RT20, RT30, RT custom, EDT, D50, C50, C custom and TS parameters (see the ISO 3382 normative).

Figure 1 - Room Impulse Response

Figure 2 - RT30 computed from Schroeder Plot of data in Figure 1

Figure 3 - RT30 and other acoustical parameters, computed for all octave bands

Figure 4 - RT30, graph for all octave bands

Room Impulse Response has to be measured by using the main program, Sample Champion (more information in Application note #11). The Room Impulse Response gives information about the reverberation time by mean of the Schroeder Plot (a detailed explanation of this analysis technique is described in the Application Note #12).

Acoustical parameters computed by using this plugin:

EDT
The EDT parameter (Early Decay Time) is the reverberation time, measured over the first 10 dB of the decay.

D50
The D50 parameter (Definition or Deutlichkeit) is the early to total sound energy ratio.

C50
The C50 parameter (Clarity or Klarheitsmass) is the early to late arriving sound energy ratio.

TS
The TS parameter (Centre Time) is the time of the centre of gravity of the squared impulse response.

Room Acoustics topics on this subject on PureBits site.

Go to Sample Champion features.

What is Sample Champion?

Accurate, fast and powerful

Sample Champion is an accurate and easy to use audio measurement software. It has been designed for acoustical technicians, sound engineers, scientists and students. With this software you'll be able to easily perform Impulse Response measurements, FFT analysis and much more.

Amazing features

Some very useful options are available, such as:

MLS pre-filtering (pink and/or custom spectrum)
synchronous averaging in time and frequency domain
double precision FFT
real-time results (the Impulse Response can be monitored during the averaging process)
possibility to calibrate the system using internal or external sources.

Expandable and versatile

Sample Champion has been designed with special attention to the possibility of future improvements and expansions. Special purpose signal processing plug-ins are available and others will be released.

Currently available pugins:

Audio Quality Plugin
SNR, THD, THD+N,IMD

Filter Banks
This module allows to approximate BUTTERWORTH and CHEBYSHEV low-pass, band-pass and high-pass analog filters. Two banks of IEC 1260 Octave and 1/3 Octave Filter Banks are implemented as presets.

Waterfall Plot
This module computes and plots a 3D Cumulative Spectral Decay of an impulse response.

Room Acoustics
Computation of Reverberation Time, Early Decay Time, Definition, Clarity and Centre Time.

Go to Sample Champion features or go directly to the download page and try yourself the trial version of Sample Champion! (Sample Champion requires Windows 95/98/2000 or NT4 and a full-duplex audio sound card).

Sample Champion User Manual is now available as single printable PDF file . Click here.