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SPL De-Esser Description
The SPL Auto-Dynamic De-Esser is a highly specialised audio tool for
removing undesired sibilant frequencies in a very simple and musical
way without compromising the timbre and natural character of a voice.
To solve this difficult problem, SPL has developed a new circuit design
that combines ease of use with natural sound characteristics and the
highest level of technical performance. SPLs Auto Dynamic De-Esser
monitors the S-frequency spectrum and automatically detects the
sibilant frequencies. The de-ess bandwidth is set so narrowly around
the range of the sibilance that neighbouring frequencies remain
unaffected. Input processed via this frequency band is mixed back into
the main signal phase-inverted so that only the S-sounds are cancelled
where the S-reduction controller determines the intensity of the
phase-cancelled mix. The result is a neutral, unobtrusive and extremely
effective de-essing process. Even at high S-reduction values the
de-essing has a negligible effect on the character and timbre of the
voice.
Rounding out the amazingly simple control
system is an automatic threshold-adjusting function. Differences in the
input level caused by the varying distance to the mic, are compensated
for automatically. This ensures even De-Essing independent of signal
level so any necessary compression may be applied post the de-esser.
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