Clarity is a measure
of the degree to which individual sounds stand apart from one another.
This measure is based on the amount of reverberation and echo present. If
there is no reverberation and echo present the individual sounds will be
mutually exclusive and clear however if there is reverberation and echo
present, the reverberant echo from preceding sound will affect the
following sound clarity.
Clarity is defined as
the ratio in dB of the energy of the early arriving sound (including the
direct sound) to the late arriving sound (mainly reverberation). The
larger this level turns out, the clearer is the sound impression, because
it is hardly disturbed by later arriving diffused sound.
For Speech Clarity,
the dividing point between early and late is 50 ms from the first arrival
and is known in the sound industry as: C50 Clarity.