Two approaches to speech intelligibility#
Acouso-ROOM provides two approaches to estimating speech intelligibility.
Room Analysis — statistical STI potential#
A screening estimate derived from octave-band reverberation times, assuming an idealised exponential decay and quiet conditions. The reverberation-only relationship below describes the basis of this calculation.
Illustrative reverberation-only modulation transfer
This relationship describes modulation loss caused by an idealised exponential reverberant decay under quiet conditions. It forms part of the statistical STI-potential calculation.
- m
- Modulation transfer (dimensionless)
- fₘ
- Modulation frequency, distinct from the acoustic octave-band frequency (Hz)
- T₆₀
- Band reverberation time (s)
Acoustic Ray Analysis — receiver-based STI estimate#
A separate calculation based on the predicted sound-energy response at each listening position, using modulation-transfer principles described in IEC 60268-16. It evaluates the timing and distribution of arriving energy and incorporates the selected background-noise scenario where specified.
Calculation assumptions and limitations
For visualisation and illustrative listening, see Result previews.