HIGH INTELLIGIBILITY (Haas Effect)
VOCAL BOOTH The high intelligibility vocal booth incorporates the
Haas effect into the traditional signature of a dry vocal booth.
The specification for this booth is found in the ETC (Energy Time
Curve).
The standard dry vocal booth (shown
on left) has a direct signal spike that lifts out of a low level
noise background. Interior reflections and resonances will color
the signal and smear the attack transient detail. The direct signal
in the Haas effect vocal booth (shown on right) has a 4 ms ETG (Early
Time Gap) followed by a statistically diffuse group of early reflections.
This statistical ambience produces a bright and openly natural sound
at the mic.
For very complete technical discussion
of this and more, Click
Here.
The sound isolation of any booth should
be rated at 30 dB, STC or better. The decay rate of any vocal booth
should be RT-60 of 100 ms or better. The quality of the early reflections
in the Haas Effect vocal booth is also specified. These must be
the specular, coherent type. The diffusion rate is 1000/sec or better
with random time offsets while the RT-60 decay rate is 75 to 100
ms.
