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The time it takes for the sound level to decay by 10 dB from its initial level in a room, providing a measure that is closer to the listener's perception of room acoustics affecting speech intelligibility.

Systems designed to increase the strength of the sound signal, which in turn can affect speech intelligibility positively by improving the signal-to-noise ratio.

An involuntary response where speakers alter their vocal effort in response to loud environments, improving speech intelligibility but sometimes causing vocal strain.

The time it takes for sound to decrease by 60 decibels in a room after the sound source has stopped, significantly influencing speech intelligibility in spaces.

The distance from a sound source at which the direct sound level is equal to the reverberant sound level, after which intelligibility tends to drop off.

The ratio of the level of the speech signal to the level of background noise, crucial for understanding speech in noisy environments.

The ratio of direct sound energy to reverberant sound energy in a space, with a higher ratio typically being associated with better speech intelligibility.

A standard measure that evaluates how much of speech is audible, representing the percentage of the critical band levels which are above the threshold of hearing.

Describes how various modulation frequencies are transmitted through a system, affecting speech intelligibility. It is used to calculate the STI.

The level of all unwanted sounds in a space, which can mask speech and deteriorate speech intelligibility, important in setting standards for acceptable indoor noise levels.

A measure quantifying the proportion of speech that is understandable, which plays a major role in communication systems design and room acoustics optimization. It is a predictor of speech intelligibility.

Measures the ratio of early arriving sound energy to later arriving energies in the first 50 ms, with higher values indicating better speech intelligibility.

A number between 0 and 1 that represents the fraction of incident sound energy absorbed by a surface, influencing reverberation and thus impacting speech intelligibility in architectural acoustics.

Phenomenon where the presence of one sound makes it difficult to hear another sound, thus reducing speech intelligibility, particularly problematic in multi-talker environments.