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In the past, properly identifying the frequencies of the feedback modes and correctly placing the narrow-band filters
was a time consuming endeavor. Today automatic feedback eliminators greatly reducing the time it takes to equalize
a system. ClearOne has recently developed DARe (Dynamic Automatic Resonance eliminator), the most advanced
feedback elimination algorithm available.
How ClearOne’s Dynamic Automatic resonance eliminator is better
first, the DARe™ feedback eliminator uses proprietary adaptive algorithms that have evolved from ClearOne’s years of
experience and expertise in echo cancellation technology. These algorithms eliminate feedback by rapidly identifying a
feedback node and then placing a narrow-band filter at that frequency. features include:
simplified setup • .
+ Other feedback eliminators require that there be no other sounds present during setup and require manual
intervention during setup. ClearOne’s feedback eliminator precisely and automatically places the proper filter at
the right frequency even in the presence of talkers, music, and noise, with a simple click of a button.
+ Setup identifies the number of filters needed to increase system gain by a predetermined level.
Locks on to feedback faster • .
+ DARe senses the start of a regenerative loop that leads to feedback and identifies the frequency before full
blown feedback arises.
identifies multiple resonance frequencies simultaneously • .
more precisely places the filter that stops the ringing noise • .
+ The placement of the filter is accurate to 1Hz.
Places a filter just large enough to get the job done without throwing out a big chunk of the desired •
audio .
Does not place filters at frequencies where they are not needed • .
+ leaves the sound as natural as possible
ring eliminator removes the hollow sound generated from a system that is close to but not yet in full •
feedback
The DARe feedback eliminator works hand in hand with proper system design, installation and adjustment to maximize
system gain before feedback. Steps that need to be taken to minimize the feedback include:
Do not place microphones too close to loud speakers. •
Locate microphones as close to participants as possible. •
minimize the number of active microphones. •
Use acoustic room treatment to prevent strong reflections from room surfaces from entering the •
microphone.
Use microphones with smooth off-axis frequency responses.
•
Use proper filtering to adjust for non-linearity of the loudspeaker system. •
The effects of these steps can be quantified at the system design phase. Once the system designer has performed
the calculations that verify that the system will operate at the desired level without feedback and the system is properly
installed, equalization can begin. first broadband equalization is performed to smooth the frequency response then the
setup of the DARe feedback eliminator can begin.