Behringer FEEDBACK DESTROYER PRO DSP1100P User Manual download pdf (Page 18)

5. OPERATION

The Behringer FEEDBACK DESTROYER can operate in four different modes. To meet more complex re-

quirements with regard to flexible signal processing, these modes can be combined in a program.

5.1 Activating/deactivating the filters

Off

mode, the corresponding filter is deactivated and can be activated by selecting one of the modes

described below.

5.2 Manual filters / parametric equalizer

The FEEDBACK DESTROYER allows you to freely process any music signals. To raise or lower specific

frequencies in level, you can directly select these frequencies by means of the manual filters (

Parametric

mode). Each filter has the functionality of a fully parametric EQ, i.e. you can set the center frequency, the

quality factor (Q) and the amount of boost/cut (in dB).

5.3 Automatic filters

The FEEDBACK DESTROYERs automatic filters operate in two modes:

Single-Shot

and

Auto

mode. In

order to find a feedback, the FEEDBACK DESTROYER divides the entire frequency band into 1/60 octave

steps (20 Hz to 20 kHz) and determines the respective level of these individual bands. He compares this

value to the level of the entire signal. The difference of these levels determines whether a filter is set. The

FEEDBACK DESTROYER now provides you with the unique possibility to adapt this parameter according to

your own needs. You can edit this feedback sensitivity (see 5.4.2) within a range of -3 dB to -9 dB (in 1 dB

steps). The standard value for this parameter is -6 dB. This value provides an optimal recognition of feedback

during most applications. During e.g. a pure speech transmission, the feedback sensitivity can be lowered to

-9 dB. In this way, the algorithm would recognize and would suppress a feedback even faster. On the other

hand a higher adjustment of the feedback sensitivity (e.g. -3 dB) makes feedback suppression more stable.

In addition to that intended feedbacks (guitars or keyboards) become recognized much more slower.

Filters in Single-Shot mode automatically analyze the music signal to detect feedback frequencies. Having

detected such a frequency, the filter automatically configures its parameter to suppress feedback as effi-

ciently as possible. As the filter is locked to the detected frequency, this mode is ideally suited to suppress

feedback having a constant frequency. Possible applications are “fixed-position” microphones (e.g. on the

drums). After the filter has adjusted itself automatically, it enters a special Lock mode, which means that

although the frequency remains fixed, the width and depth of the filter are still being adapted to the feedback

frequency, i.e. the width is increased as soon as the feedback frequency begins to shift, and the gain is cut if

feedback prevails. The gain is not reduced to prevent feedback from recurring.

All microphones that are moved during a performance (e.g. vocal mics) very often have varying feedback

frequencies. This type of feedback should be suppressed in Auto mode. As in Single-Shot mode, the filter

automatically selects an ideal setting for feedback suppression. But in Auto mode a locked filter tracks and

suppresses the feedback frequency even as it changes. The optimum frequency is selected automatically

and the filter is set to narrow-band mode so as to influence the music signal as little as possible. If your music

contains wanted feedback elements (e.g. guitar feedback), it is highly probable that these will be suppressed

too in Auto mode, because from a physical point of view it is impossible to distinguish “wanted” from “un-

wanted” feedback. Please read the hints given in section 6.3 to work around this situation.

5.4 Working with programs

In order to store your favorite settings, the FEEDBACK DESTROYER has ten user presets and a default

preset. All operating parameters can be stored, i.e. your programs are recalled in full detail. Of course, all

settings will be retained even after switching the FEEDBACK DESTROYER off. Owing to state-of-the-art

circuitry, no internal battery is needed, hence the memory contents will not be lost. In the default preset

(display “--”), which serves as a basis for creating your own programs, all filters remain in the parametric

mode, with bandwidth set to 1 octave, a frequency of 500 Hz and 0 dB gain.

5. OPERATION

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Behringer FEEDBACK DESTROYER PRO DSP1100P User Manual Page 18

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